IBIC2022 - Table of Session: TUP (Tuesday Poster Session)

Paper	Title	Page
TUP01	Commissioning of the Libera Beam Loss Monitoring System at SPEAR3	211
	K. Tian, S. Condamoor, W.J. Corbett, N.L. Parry, J.A. Safranek, J.J. Sebek, F. Toufexis SLAC, Menlo Park, California, USA
	SPEAR3 is a third generation synchrotron radiation light source, which operates approximately 9 months each year with a very high reliability. The beam loss monitoring system in the storage ring has recently been upgrade to the modern Libera system from the original legacy hardware. During the initial stage of the new beam loss monitoring system deployment, it was proved to be useful for a new lattice commissioning at SPEAR3. In this paper, we will report the progress in the Libera system commissioning at SPEAR3 and present some first results.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP01
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 03 November 2022
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TUP02	Design of High Dynamic Range Preamplifiers for a Diamond-Based Radiation Monitor System	216
	M. Marich, S. Carrato University of Trieste, Trieste, Italy L. Bosisio, A. Gabrielli, Y. Jin, L. Lanceri INFN-Trieste, Trieste, Italy G. Brajnik, G. Cautero, D. Giuressi Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy L. Vitale Università degli Studi di Trieste, Trieste, Italy
	Regardless of the different accelerator types (light sources like FELs or synchrotrons, high energy colliders), diagnostics is an essential element for both personnel and machine protection. With each update, accelerators become more complex and require an appropriate diagnostic system capable of satisfying multiple specifications, that become more stringent as complexity increases. This paper presents prototyping work towards a possible update of the readout electronics of a system based on single-crystal chemical vapor deposition (scCVD) diamond sensors, monitoring the radiation dose-rates in the interaction region of SuperKEKB, an asymmetric-energy electron-positron collider. The present readout units digitize the output signals from the radiation monitors, process them using an FPGA, and alert the accelerator control system if the radiation reaches excessive levels. The proposed updated version introduces a new design for the analog front end that overcomes its predecessor’s limits in dynamic range thanks to high-speed switches to introduce a variable gain in transimpedance preamplifiers, controlled by an ad-hoc developed FPGA firmware.
	Poster TUP02 [1.292 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP02
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 16 October 2022
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TUP03	The Beam Loss Monitoring System after the LHC Long Shutdown 2 at CERN	220
	M. Saccani, E. Effinger, W. Viganò, C. Zamantzas CERN, Meyrin, Switzerland
	Most of the LHC systems at CERN were updated during the Long Shutdown 2, from December 2018 to July 2022, to prepare the accelerator for High-Luminosity. The Beam Loss Monitoring system is a key part of the LHC’s instrumentation for machine protection and beam optimisation by producing continuous and reliable measurements of beam losses along the accelerator. The BLM system update during LS2 aims at providing better gateware portability to future evolutions, improving significantly the data rate in the back-end processing and the software efficiency, and adding remote command capability for the tunnel electronics. This paper first recalls the Run 1 and Run 2 BLM system achievements, then reviews the main changes brought during LS2, before focusing on the commissioning phase of Run 3 and future expectations.
	Poster TUP03 [2.871 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP03
About •	Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 29 October 2022
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TUP04	Beam Loss Monitor for Polish Free Electron Laser (PolFEL): Design and Tests	225
	R. Kwiatkowski, R. Nietubyc, J. Szewiński, D.R. Zaloga NCBJ, Świerk/Otwock, Poland A.I. Wawrzyniak NSRC SOLARIS, Kraków, Poland
	Funding: European Regional Development Fund in the framework of the Smart Growth Operational Programme and Regional Operational Programme for Mazowieckie Voivodeship. The Beam Loss Monitor (BLM) system is primarily used for machine protection and is especially important in the case of high energy density of accelerated beam, when such a beam could cause serious damages due to uncontrolled loss. PolFEL linear accelerator is designed with the beam parameters, which made BLM an essential system for machine protection. The design of BLM system for PolFEL is composed of several scintillation probes placed along and around the accelerator. The paper reports on design and first tests of prototype detector, which is planned to be used for PolFEL project. The prototype was tested in NCBJ and SOLARIS, using radioactive calibration samples and linear electron accelerator as a sources. We also present results of numerical investigation of radiation generated due to interaction of fast electrons with accelerator components.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP04
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 19 October 2022
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TUP05	Experience with Machine Protection Systems at PIP2IT	229
	A. Warner, M.R. Austin, L.R. Carmichael, J.-P. Carneiro, B.M. Hanna, E.R. Harms, M.A. Ibrahim, R. Neswold, L.R. Prost, R.A. Rivera, A.V. Shemyakin, J.Y. Wu Fermilab, Batavia, Illinois, USA
	Funding: * This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics The PIP2IT accelerator was assembled in multiple stages in 2014 - 2021 to test concepts and components of the future PIP-II linac that is being constructed at Fermilab. In its final configuration, PIP2IT accelerated a 0.55 ms x 20 Hz x 2 mA H⁻ beam to 16 MeV. To protect elements of the beam line, a Machine Protection System (MPS) was implemented and commissioned. The beam was interrupted faster than 10 µs when excessive beam loss was detected. The paper describes the MPS architecture, methods of the loss detection, procedure of the beam interruption, and operational experience at PIP2IT.
	Poster TUP05 [1.233 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP05
About •	Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 18 September 2022
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TUP06	Design and Simulation of Button Bpm for the Low Energy Storage Rings for Fourth Generration Light Sources
	Z.Q. Luo, Z. Liu HUST, Wuhan, People’s Republic of China
	Compared to 3rd-generation light sources, 4th-generation SR light sources improve the brightness by reducing the emittance of the electron beam. To ensure the extremely low emittance of electron beams, it is necessary to provide more accurate beam position measurement. Based on the BPM of the 3rd generation light source (SSRF), the design of button BPM for a diffraction-limited storage ring in the low-energy region of the 4th-generation light source is presented in this paper. Here we have focused on optimizing the BPM in terms of the basic structure sizes, the wakefield caused by electron beam transport and the voltage signals picked up by the electrodes, etc. The optimization improves the measurement resolution of BPM together with matching the requirements of beam position measurement proposed by the low energy storage ring.
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TUP09	Design of the Beam Position Monitor for SOLEIL II	233
	M. El Ajjouri, F. Alves, A. Gamelin, N. Hubert SOLEIL, Gif-sur-Yvette, France
	The Beam Position Monitors for the SOLEIL low emittance upgrade project are in the design phase. Efforts are put on the minimization of the heat load on the button by optimizing the longitudinal impedance and the BPM materials. To validate the mechanical design and tolerances a first prototype has been manufactured and controlled. This paper presents the mechanical design of the BPM, the metrology of the prototype and the lessons learned from this prototyping phase.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP09
About •	Received ※ 10 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 07 November 2022
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TUP10	Development of a New Measurement System for Beam Position Pickups in the LINAC and Beam Energy Measurement (Time of Flight) in the MEBT for Medaustron	238
	M. Repovž, M. Cerv, C. Kurfürst, G. Muyan, S. Myalski, A. Pozenel, C. Schmitzer, M. Wolf EBG MedAustron, Wr. Neustadt, Austria A. Bardorfer, B. Baričevič, P. Paglovec, M. Škabar I-Tech, Solkan, Slovenia
	The MedAustron Ion Therapy Centre is a synchrotron-based particle therapy facility which delivers proton and carbon beams for clinical treatment. Currently, the facility treats roughly 40 patients per day and is improving its systems and workflows to further increase this number. MedAustron was commissioned and is operational without fully integrated systems for measurements of ’time of flight’ (beam energy) in the MEBT and beam position in the LINAC. This paper presents the newly developed system for these use cases, which will improve the overall commissioning and QA accuracy. It will unify the hardware used for the cavity regulation in the injector LLRF and the synchrotron LLRF. It will also be used for SYNC pickups, Schottky monitors and RF knock-out exciter. The new system is based on the CotS MicroTCA platform, which is controlled by the MedAustron Control System based on NI-PXIe. Currently it supports fiber-optic links (SFP+), but other links (e.g. EPICS, DOOCS) can be established. The modular implementation allows for connections to other components, such as motors, amplifiers, or interlock systems and will increase the robustness and maintainability of the accelerator.
	Poster TUP10 [2.590 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP10
About •	Received ※ 04 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 28 September 2022
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TUP11	A Cryogenic RF Cavity BPM for the Superconducting Undulator at LCLS	241
	C.D. Nantista, A.A. Haase, P. Krejcikpresenter SLAC, Menlo Park, California, USA
	The new superconducting undulator beamline at LCLS requires the BPMs to be operated at cryogenic temperatures alongside the undulator magnets. They are used for beam-based alignment of the undulator magnets and quadrupole and require submicron resolution to achieve good FEL performance. This is to be achieved with X-band RF cavity BPMs, as is done now on the permanent undulator beamline. However, operating the cavities at cryogenic temperatures introduces significant challenges. We review the changes in RF properties of the cavities that result from cooling and how the design is changed to compensate for this. This includes a novel approach for employing a rectangular cavity with split modes to separately measure the X and Y position without coupling.
	Poster TUP11 [1.875 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP11
About •	Received ※ 11 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 11 November 2022
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TUP12	First Application of a Multiprocessing System-on-Chip BPM Electronics Platform at SwissFEL	245
	B. Keil, R. Ditter, M. Gloor, G. Marinkovic, J. Purtschert PSI, Villigen PSI, Switzerland
	We have developed a new BPM electronics platform based on a MultiProcessing System-on-Chip (MPSoC). This contribution introduces the first application of the platform at the Paul Scherrer Institute (PSI), which is the cavity BPM system for the SwissFEL soft X-ray undulator beamline called ’Athos’ [1], where a larger number of systems are now operational. Measurement results and differences to the predecessor system will also be presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP12
About •	Received ※ 02 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 26 September 2022
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TUP13	Standard Button BPMs for PETRA IV	249
	S. Strokov, M. Holz, G. Kube, D. Lipka, S. Vilcins DESY, Hamburg, Germany
	A new diffraction limited light source PETRA IV (DESY, Germany) with ultra-low emittance is currently being designed as an upgrade of the 3rd generation light source PETRA III. For transverse beam position measurements, beam position monitors (BPMs) will be used as an essential part of the beam diagnostic system. There will be a total of about 800 BPMs distributed along the 2.3 km storage ring. The inner diameter of the standard beam pipe, and therefore of most of the BPM chambers, will be 20 mm. The primary purpose of the systems is to provide high-resolution measurements of the transverse position of the electron beam. By specification, the impact of the mechanical tolerances on the position readings should be below 150 microns which is essential for the commissioning of the machine. To achieve this goal, the dependence of the accuracy of the beam position measurement on the tolerances of each manufactured part of the BPM was studied. This paper summarizes the development and optimization of each part of the BPM by using EM simulations performed with CST Studio Suite.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP13
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 01 October 2022
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TUP14	Transverse Emittance Measurement in Injector of RAON
	E.H. Lim Korea University Sejong Campus, Sejong, Republic of Korea Y.S. Chung, G.D. Kim, J.W. Kwon IBS, Daejeon, Republic of Korea E.-S. Kim KUS, Sejong, Republic of Korea
	It is important to measure the transverse emittance, a beam characteristic for beam dynamics calculation. There are several methods for measuring transverse emittance. The emittance is calculated from the phase space distribution of the beam measured by Allison scanner. Quadrupole scan with wire scanner or multi wire scanner for RAON injector were also performed to compare with these data. RAON injector consists of ECR-IS, LEBT, RFQ, MEBT. Various diagnostic devices such as 8 Wire Scanners and 1 Allison Scanner were installed in beam transport line. Each diagnostic device was driven by PLC and the current was measured with microTCA-based DAQ system. EPICS was used to control the diagnostic system, and each device was driven and measured according to the sequencer module. In this paper, the measurement result of each diagnostic device and result of the emittance measurement on Ar-40 beam are presented.
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TUP15	New Gas Target Design for the HL-LHC Beam Gas Vertex Profile Monitor	252
	H. Guerin, R. De Maria, R. Kersevan, B. Kolbinger, T. Lefèvre, M.T. Ramos Garcia, B. Salvant, G. Schneider, J.W. Storey CERN, Meyrin, Switzerland S.M. Gibson, H. Guerin Royal Holloway, University of London, Surrey, United Kingdom
	The Beam Gas Vertex (BGV) instrument is a novel non-invasive transverse beam profile monitor under development for the High Luminosity Upgrade of the Large Hadron Collider (HL-LHC). Its principle is based on the reconstruction of the tracks and vertices issued from beam-gas inelastic hadronic interactions. The instrument is currently in the design phase, and will consist of a gas target, a forward tracking detector installed outside the beam vacuum chamber and computing resources dedicated to event reconstruction. The transverse beam profile image will then be inferred from the spatial distribution of the reconstructed vertices. With this method, the BGV should be able to provide bunch-by-bunch measurement of the beam size, together with a beam profile image throughout the whole LHC energy cycle, and independently of the beam intensity. This contribution describes the design of the gas target system and of the gas tank of the future instrument.
	Poster TUP15 [1.080 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP15
About •	Received ※ 06 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 12 December 2022
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TUP16	FOCUS: Fast Monte-CarlO Approach to Coherence of Undulator Sources	257
	M. Siano Università degli Studi di Milano, Milano, Italy D. Butti, T. Lefèvre, S. Mazzoni, G. Trad CERN, Meyrin, Switzerland G. Geloni EuXFEL, Schenefeld, Germany U. Iriso, A.A. Nosych, L. Torino ALBA-CELLS, Cerdanyola del Vallès, Spain B. Paroli, M.A.C. Potenza Universita’ degli Studi di Milano & INFN, Milano, Italy
	"Fast Monte-CarlO approach to Coherence of Undulator Sources" (FOCUS) is a new GPU-based code to compute the transverse coherence of X-ray radiation from undulator sources. The code relies on scaled dimensionless quantities and analytic expressions of the electric field emitted by electrons in an undulator, obtained in the frequency domain under paraxial approximation (justified by the assumption of ultra-relativistic electrons) and free space propagation, with the addition of the resonance approximation. We describe the core structure of the code, which exploits GPUs for massively parallel computations. We validate our approach by direct comparison with SRW (Synchrotron Radiation Workshop) simulations. The benchmarks prove that FOCUS yields similar results with respect to SRW, while at the same time reducing the computation times by five orders of magnitude. Finally, we show examples of applications to beam size diagnostics. The aim of the code is to fast evaluating the transverse coherence properties of undulator X-ray radiation as a function of the electron beam parameters, and to support and help preparing more rigorous numerical simulations with traditional codes like SRW.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP16
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 19 September 2022
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TUP17	HL-LHC Beam Gas Fluorescence Studies for Transverse Profile Measurement	261
	O. Sedláček, M. Ady, C. Castro Sequeiro, A.R. Churchman, S. Mazzonipresenter, G. Schneider, K. Sidorowski, R. Veness CERN, Meyrin, Switzerland P. Forck, S. Udrea GSI, Darmstadt, Germany M. Sameed European Organization for Nuclear Research (CERN), Geneva, Switzerland O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang The University of Liverpool, Liverpool, United Kingdom O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang Cockcroft Institute, Warrington, Cheshire, United Kingdom
	In a gas jet monitor, a supersonic gas curtain is injected into the beam pipe and interacts with the charged particle beam. The monitor exploits fluorescence induced by beam-gas interactions, thus providing a minimally invasive transverse profile measurement. Such a monitor is being developed as part of the High Luminosity LHC upgrade at CERN. As a preliminary study, the fluorescence cross section of relevant gases must be measured for protons at 450 GeV and 6.8 TeV (i.e. the LHC injection and flat top energies). In these measurements, neon, or alternatively nitrogen gas, will be injected into the LHC vacuum pipe by a regulated gas valve to create an extended pressure bump. This work presents the optical detection system that was installed in 2022 in the LHC to measure luminescence cross-section and horizontal beam profile. Preliminary measurements of background light and first signals are presented in this paper.
	Poster TUP17 [0.673 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP17
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 14 September 2022 — Issue date ※ 21 November 2022
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TUP18	High-Resolution Interferometric Beam-Size Monitor For Low-Intensity Beams	265
	B. Alberdi-Esuain, J.-G. Hwang, T. Kamps HZB, Berlin, Germany T. Kamps HU Berlin, Berlin, Germany
	Plasma-based accelerator technology is reaching a mature state, where applications of the beam for medical sciences, imaging, or as an injector for a future large-scale accelerator-driven light source become feasible. Particularly, the requirements for beam injection into a storage-ring-based light source are very strict with regards to beam quality and reliability. A non-invasive diagnostics greatly helps to reduce the commissioning time of the machine. We present a device suitable for online, non-destructive monitoring of the transverse spot size of the injected beam. In order to measure lateral beam sizes with a few-micrometer resolution, the technique uses an interferometric regime of coherent synchrotron radiation that is enabled by a sub-femtosecond short bunch-length. Simulations of the photon flux and the retrieval of the beam spot-size are performed for different bandwidth filters in order to define the bandwidth acceptance. Results show the potential of the proposed system that achieves precise retrieval of the complex degree of coherence at an extremely low photon intensity similar to those expected towards the plasma-acceleration injectors.
	Poster TUP18 [9.961 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP18
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 03 December 2022
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TUP19	Visible Range Polarized Imaging for High Resolution Transverse Beam Size Measurement at SOLEIL	269
	M. Labat, A. Bence, A. Berlioux, B. Capitanio, G. Cauchon, J. Da Silva, N. Hubertpresenter, D. Pédeau, M. Thomasset SOLEIL, Gif-sur-Yvette, France
	SOLEIL storage ring is presently equipped with three diagnostics beamlines: two in the X-ray range (pinhole cameras) and one in the visible range. The visible range beamline relies on a slotted copper mirror extracting the synchrotron radiation from one of the ring dipoles. The extracted radiation is then transported down to a dedicated hutch in the experimental hall. Up to now, this radiation was split into three branches for rough monitoring of the beam transverse stability, bunch length measurements and filling pattern measurements. In the framework of SOLEIL’s upgrade, we now aim at developing a new branch for high resolution beam size measurement using polarized imaging. This work presents the various modifications recently achieved on the beamline to reach this target, including a replacement of the extraction mirror, and preliminary results towards transverse beam size measurement.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP19
About •	Received ※ 09 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 25 September 2022
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TUP20	Correction for Systematic Errors in Transverse Phase Space Measurements at PITZ	273
	C.J. Richard, Z. Aboulbanine, G.D. Adhikari, N. Aftab, P. Boonpornprasert, G.Z. Georgiev, M. Groß, A. Hoffmann, M. Krasilnikov, X.-K. Li, A. Lueangaramwong, R. Niemczyk, H.J. Qian, F. Stephan, G. Vashchenko, T. Weilbach DESY Zeuthen, Zeuthen, Germany
	Funding: This work was supported by the European XFEL research and development program The Photo Injector Test Facility at DESY in Zeuthen (PITZ) characterizes and optimizes electron sources for use at FLASH and European XFEL. AT PITZ, the transverse phase space is measured using a single slit scan and scintillator screen method. With the trend in photoinjectors towards lower current and emittance, these measurements become increasingly influenced by systematic errors including camera resolution and scintillator response due to smaller spot sizes. This study investigates the effects and corrections of the systematic errors for phase space measurements at PITZ.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP20
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 01 November 2022
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TUP21	Scintillator Nonproportionality Studies at PITZ	277
	A.I. Novokshonov, G. Kube, S. Strokov DESY, Hamburg, Germany Z. Aboulbanine, G.D. Adhikari, N. Aftab, P. Boonpornprasert, G.Z. Georgiev, J. Good, M. Groß, C. Koschitzki, M. Krasilnikov, X. Li, O. Lishilin, A. Lueangaramwong, D. Melkumyan, F. Mueller, A. Oppelt, H.J. Qian, F. Stephan, G. Vashchenko, T. Weilbach DESY Zeuthen, Zeuthen, Germany
	A standard technique to measure beam profiles in linear accelerators are screen monitors using scintillating screens. This technique is used e.g. at the European XFEL in order to overcome coherence effects in case of OTR usage []. During the XFEL commissioning it was found out that screens based on LYSO:Ce as scintillating material revealed a nonproportional light output []. Reason for it is the high particle beam density. As consequence it was decided to exchange LYSO:Ce by GAGG:Ce scintillators because the excitation carriers can rapidly transfer their energy to excited states of gadolinium, and a rapid migration of this energy among the Gd sub-lattice is expected. Driven by the observations at XFEL a series of measurements was started to investigate the properties of various scintillator materials (LYSO:Ce, YAP:Ce, YAG:Ce, LuAG:Ce and GAGG:Ce). The last measurement campaign was carried out at PITZ which allows to operate at higher beam charge and lower electron energy compared to the XFEL. The present work summarizes the results of these measurements. S.Wesch and B.Schmidt, in Proc. DIPAC’11, Hamburg, WEOA01, pp. 539-543. ** G.Kube, A.Novokshonov, S.Liu, M.Scholz, in Proc. FEL’19, Hamburg, WEB01, pp. 301-306.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP21
About •	Received ※ 11 September 2022 — Revised ※ 13 September 2022 — Accepted ※ 11 October 2022 — Issue date ※ 15 October 2022
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TUP22	Linear Approach to Space Charge Calculations Proton Testbeam at KAHVELab (PTAK)
	G. Unel UCI, Irvine, California, USA A. Adiguzel, S. Esen Istanbul University, Istanbul, Turkey H. Cetinkaya Dumlupinar University, Faculty of Science and Arts, Kutahya, Turkey S. Ogur, S. Ogur CERN, Meyrin, Switzerland E.V. Ozcan Bogazici University, Bebek / Istanbul, Turkey
	Funding: This study is supported by The Scientific and Technological Research Council of Turkey (TUBITAK), Project No: 119M774 In Kandilli Detector, Accelerator, and Instrumentation Laboratory, a proton accelerator system is produced using local resources consists of 2 types of ion sources, a low energy beam transfer line (LEBT)and a 1-meter-long RFQ that will operate at 800 MHz. A bespoke Python program calculated the space charge effect created by internal interactions of the beam along the line before entering the RFQ. The results were validated with CERN’s TRAVEL program. The growth of the beam with a 1.4 mA current value in the transverse axis due to the effect of space charge has been calculated with a maximum margin of error of 4% for different current and frequency values. Studies using different emittance calculation methods on emittance growth due to space charge dominance continues to be developed. In addition, studies on comparing new methods’ findings with outputs of A Space Charge Tracking Algorithm (ASTRA) and RF-Track Programs are ongoing and aim to finalize by the end of 2023.
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TUP23	Commissioning of the Timing System at ESS	281
	N. Milas, G.S. Fedel, A.A. Gorzawskipresenter, J.J. Jamróz, J.P.S. Martins ESS, Lund, Sweden
	The European Spallation Source (ESS), currently under construction and initial commissioning in Lund, Sweden, will be the brightest spallation neutron source in the world, when its driving proton linac achieves the design power of 5 MW at 2 GeV. Such a high power requires production, efficient acceleration, and almost no-loss transport of a high current beam, thus making design and beam commissioning of this machine challenging. The commissioning runs of 2021 and early 2022 were the first where the master timing system for the linac was fully available. As a consequence of that, the beam actuators and beam monitoring equipment relied fully on timing events sent accross the machine, not only to be triggered to act but also to get the configuration. In this paper, we describe the timing system as available today, present how we define and create the beam pulses using the available parameters. We also present planned future upgrades and other outlook for the system.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP23
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 12 October 2022
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TUP25	Simulation and Measurements of the Fast Faraday Cups at GSI UNILAC	286
	R. Singh, P. Forck, T. Reichert, A. Reiter GSI, Darmstadt, Germany S. Klaproth THM, Friedberg, Germany G.O. Rodrigues IUAC, New Delhi, India
	Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05P21RORB2. Joint Project 05P2021 - R&D Accelerator (DIAGNOSE) The longitudinal charge profiles of the high intensity heavy ion beam accelerated at the GSI UNILAC upto 11.4 MeV/u can differ significantly in consecutive macro-pulses. Variations in bunch shape and mean energy were also observed within a single macro-pulse. In order to have an accurate and fast determination of bunch shape and its evolution within a macro-pulse, a study of fast Faraday Cup designs is underway at GSI. In this contribution, we present CST particle in cell (PIC) simulations of radially coupled co-axial Fast Faraday Cup (RCFFC) and conventional axially coupled FFC (ACFFC) design. The simulation results are compared to the measurements performed under comparable beam conditions primarily with RCFFCs. A rather large impact of secondary electron emission is observed in simulations and experiments. The biasing of the FFC central electrode as a mitigation mechanism on the measured profiles is discussed.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP25
About •	Received ※ 15 September 2022 — Revised ※ 17 September 2022 — Accepted ※ 25 October 2022 — Issue date ※ 02 November 2022
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TUP26	Study on Beam Length Measurement Technique Using Highspeed Oscilloscope
	HS. Wang SSRF, Shanghai, People’s Republic of China
	In order to study the nonlinear beam dynamics in the storage ring, the SSRF BI group developed the software package HOTPCAP, which is used to extract the bunch-by-bunch 3D beam position information from the BPM electrode signal. In order to enhance the function of this software, we studied the beam length extraction method from digitized BPM electrodes signal. By analyzing the signal spectrum distribution for each bunch and each turn and gaussian fitting in frequency domain, bunch length information be extracted. Compared with the traditional longitudinal diagnostic tool streak camera, this method can obtain and store measurement data as long as ten ms while maintaining the time resolution of ps level, which is a powerful diagnostics tool for study of injection transient stage and longitudinal instability. In this paper, the hardware and software architecture of the system and the beam experimental results obtained during the third harmonic cavity commissioning are introduced.
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TUP28	Coherent Difraction Radiation for Longitudinal Electron Beam Characteristics	291
	R. Panaś NSRC SOLARIS, Kraków, Poland A. Curcio CLPU, Villamayor, Spain K. Łasocha Jagiellonian University, Kraków, Poland
	For the needs of diagnostics of the longitudinal electron beam characteristics at the first Polish free electron laser (PolFEL) project, a Coherent Diffraction Radiation (CDR) system is being developed and tested. It will allow for nondestructive bunch length measurement based on the power balance of CDR radiation collected by Schottky diodes in different ranges of sub-THz radiation. The first tests and measurements will be performed at the end of the Solaris synchrotron injector linac, where the beam profile is already known from previous studies. In addition the camera system with automatic focus was developed and tested. In this contribution the theoretical background of the measurement, calculations and first experimental steps will be presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP28
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 13 September 2022
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TUP29	ZnO(In) Scintillation Light Spectra Investigation for Heavy Ion Detector Application	294
	M. Saifulin, C. Trautmann TU Darmstadt, Darmstadt, Germany P. Boutachkov, M. Saifulin, C. Trautmann, B. Walasek-Höhne GSI, Darmstadt, Germany E.I. Gorokhova GOI, St Petersburg, Russia P. Rodnyi, I.D. Venevtsev SPbPU, St. Petersburg, Russia
	Funding: DLR financed this research within the framework of the ERA. Net RUS Plus Project RUS_ST2017-051 ZnO-based ceramics are known as promising scintillators exhibiting light emission in the ultraviolet (UV) spectral region (~390 nm) and ultrafast decay times (<1 ns). They are of great interest for applications in scintillation counters and screens at high-energy heavy ion accelerators. In this contribution, the deterioration of scintillating properties of ZnO-based ceramics subjected to heavy ion exposure at high doses is investigated. The scintillation light spectra of ZnO(In) as a function of fluence for 4.8 MeV/u 48Ca and 197Au ions were studied. We observed that the deterioration of the scintillation intensity with increasing fluence follows the Birks-Black model. * The results presented in this contribution are based on the work performed before the 24th of February, 2022. ** m.saifulin@gsi.de (corresponding author)
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP29
About •	Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 01 November 2022
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TUP30	Beam Intensity Measurement in ELENA Using Orbit Pick-Ups	296
	O. Marqversen, D. Alves CERN, Meyrin, Switzerland
	A bunched beam intensity measurement system for the CERN Extra Low ENergy Antiproton (ELENA) ring, using a cylindrical shoe-box electrostatic pick-up from the existing orbit system [1], is presented. The system has been developed to measure very challenging beam cur-rents, as low as 200nA corresponding to intensities of the order of 10⁷ antiprotons circulating with a relativistic beta of the order of 10-2. In this work we derive and show that the turn-by-turn beam intensity is proportional to the baseline of the sum signal and that, despite the AC-coupling of the system, the installed front-end electronics, based on a charge amplifier, not only guarantees the preservation of the bunch shape (up to a few tens of MHz), but also allows for an absolute calibration of the system. In addition, the linearity of the intensity measurements and their inde-pendence with respect to average beam position is evalu-ated using a standard electromagnetic simulation tool. Finally, experimental measurements throughout typical antiproton deceleration cycles are presented and their accuracy and precision are discussed.
	Poster TUP30 [1.102 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP30
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 01 November 2022
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TUP31	The Cryogenic Current Comparator at CRYRING@ESR	300
	L. Crescimbeni, D.M. Haider, A. Reiter, M. Schwickert, T. Sieber, T. Stöhlker GSI, Darmstadt, Germany H. De Gersem, N. Marsic, W.F.O. Müller TEMF, TU Darmstadt, Darmstadt, Germany M. Schmelz, R. Stolz, V. Zakosarenko IPHT, Jena, Germany F. Schmidl FSU Jena, Jena, Germany T. Stöhlker IOQ, Jena, Germany T. Stöhlker, V. Tympel HIJ, Jena, Germany V. Zakosarenko Supracon AG, Jena, Germany
	Funding: Work supported by the BMBF under contract No. 05P21SJRB1. The Cryogenic Current Comparator (CCC) at the heavy-ion storage ring CRYRING@ESR at GSI provides a calibrated non-destructive measurement of beam current with a resolution of 10 nA or better. With traditional diagnostics in storage rings or transfer lines a non-interceptive absolute intensity measurement of weak ion beams (< 1 µA) is already challenging for bunched beams and virtually impossible for coasting beams. Therefore, at these currents the CCC is the only diagnostics instrumentation that gives reliable values for the beam intensity independently of the measured ion species and without the need for tedious calibration procedures. Herein, after a brief review of the diagnostic setup, an overview of the operation of the CCC with different stored ion beams at CRYRING is presented. The current reading of the CCC is compared to the intensity signal of various standard instrumentations including a Parametric Current Transformer (PCT), an Ionization Profile Monitor (IPM) and the Beam Position Monitors (BPMs). It was shown that the CCC is a reliable instrument to monitor changes of the beam current in the range of nA.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP31
About •	Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 19 November 2022
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TUP32	Differential Current Transformer for Beam Charge Monitoring in Noisy Environments	304
	H. Maesaka, T. Inagaki RIKEN SPring-8 Center, Hyogo, Japan H. Dewa, T. Inagaki, H. Maesaka, K. Yanagida JASRI, Hyogo, Japan K. Ueshima QST, Sendai, Miyagi, Japan
	We developed a differential current transformer (CT) for electron beam charge measurement in noisy environments, such as near high-power pulse sources. This CT has four pickup wires coiled at equal intervals (90 deg.) on a toroidal core and each coil is wound for two turns. The midpoint of the coil is connected to the body ground so that a balanced differential signal is generated at both ends. A beam pipe with a ceramics insulation gap is inserted into the toroidal core to obtain a signal from a charged-particle beam. The four pairs of signals are transmitted through a CAT6 differential cable and fed into differential amplifiers. The common-mode noise from the noisy ground at the CT is canceled out by the amplifier. The four signals are then summed and digitized by an AD converter. We produced differential CTs and installed them into the new injector linac of NewSUBARU (). Before the installation, the frequency response was measured in a laboratory and a flat response of up to 100 MHz was obtained as expected. Common-mode noise cancellation was also confirmed at NewSUBARU and the CTs have been utilized for beam charge monitoring stably. : T. Inagaki et al., ’Construction of a Compact Electron Injector Using a Gridded RF Thermionic Gun and a C-Band Accelerator’, in Proc. IPAC’21, pp. 2687-2689. doi:10.18429/JACoW-IPAC2021-WEPAB039
	Poster TUP32 [1.393 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP32
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 26 October 2022
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TUP34	LHC Schottky Spectrum from Macro-Particle Simulations	308
	C. Lannoy, D. Alves, N. Mounet CERN, Meyrin, Switzerland C. Lannoy, T. Pieloni EPFL, Lausanne, Switzerland K. Łasocha Jagiellonian University, Kraków, Poland
	We introduce a method for building Schottky spectra from macro-particle simulations performed with the PyHEADTAIL code, applied to LHC beam conditions. In this case, the use of a standard Fast Fourier Transform (FFT) algorithm to recover the spectral content of the beam becomes computationally intractable memory-wise, because of the relatively short bunch length compared to the large revolution period. This would imply having to handle an extremely large amount of data for performing the FFT. To circumvent this difficulty, a semi-analytical method was developed to compute efficiently the Fourier transform. The spectral content of the beam is calculated on the fly along with the macro-particle simulation and stored in a compact manner, independently from the number of particles, thus allowing the processing of one million macro-particles in the LHC, over 10’000 revolutions, in a few hours, on a regular computer. The simulated Schottky spectrum is then compared against theoretical formulas and measurements of Schottky signals previously obtained with lead ion beams in the LHC.
	Poster TUP34 [1.864 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP34
About •	Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 01 December 2022
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TUP35	First RF Phase Scans at the European Spallation Source	313
	Y. Levinsen, R.A. Baron, E.M. Donegani, M. Eshraqi, A. Garcia Sosa, H. Hassanzadegan, B. Jones, N. Milas, R. Miyamoto, D. Noll, I. Vojskovic, R.H. Zeng ESS, Lund, Sweden M. Akhyani EPFL, Lausanne, Switzerland I. Bustinduy ESS Bilbao, Zamudio, Spain F. Grespan INFN/LNL, Legnaro (PD), Italy
	The installation and commissioning of the European Spallation Source is currently underway at full speed, with the goal to be ready for first neutron production by end of 2024. This year we accelerated protons through the first DTL tank. This included the RFQ, 3 buncher cavities in the medium energy beam transport as well as the DTL tank itself as RF elements. At the end of the DTL tank we had a Faraday cup acting as the effective beam stop. This marks the first commissioning when RF matching is required for beam transport. In this paper we discuss the phase scan measurements and analysis of the buncher cavities and the first DTL tank.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP35
About •	Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 03 October 2022
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TUP36	Beam Characterization of Slow Extraction Measurement at GSI-SIS18 for Transverse Emittance Exchange Experiments	318
	J. Yang, P. Boutachkov, P. Forck, T. Milosic, R. Singh, S. Sorge GSI, Darmstadt, Germany
	Funding: This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under GA No 101004730. The quality of slowly, typically several seconds, extracted beams from the GSI synchrotron SIS18 is characterized with respect to the temporal beam stability, the so-called spillμstructure on the 100 µs scale. A pilot experiment was performed utilizing transverse emittance exchange to reduce the beam size in the extraction plane, and the improvement of spillμstructure was found. Important beam instrumentation comprises an Ionization Profile Monitor for beam profile measurement inside the synchrotron and a plastic scintillator at the external transfer line for ion counting with up to several 10⁶ particles per second and 20 µs time slices. The performant data acquisition systems, including a scaler and a fast Time-to-Digital Converter (TDC), allow for determining the spill quality. The application of the TDC in the measurement and related MAD-X simulations are discussed.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP36
About •	Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 11 October 2022
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TUP38	Deep Neural Network for Beam Profile Classification in Synchrotron	323
	M. Piekarski NSRC SOLARIS, Kraków, Poland
	Funding: The presented work has been achieved in collaboration with AGH University of Science and Technology in Kraków as a part of a PhD thesis. The main goal of NSRC SOLARIS is to provide scientific community with high quality synchrotron light. To achieve this, it is necessary to constantly monitor many subsystems responsible for beam stability and to analyze data about the beam itself from various diagnostic beamlines. In this work a deep neural network for transverse beam profile classification is proposed. Main task of the system is to automatically assess and classify transverse beam profiles based solely on the evaluation of the beam image from the Pinhole diagnostic beamline at SOLARIS. At the present stage, a binary assignment of each profile is performed: stable beam operation or unstable beam operation / no beam. Base model architecture consists of a pre-trained convolutional neural network followed by a densely-connected classifier and the system reaches accuracy at the level of 90%. The model and the results obtained so far are discussed, along with plans for future development.
	Poster TUP38 [0.376 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP38
About •	Received ※ 30 August 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 October 2022
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TUP39	Neural Network Inverse Models for Implicit Optics Tuning in the AGS to RHIC Transfer Line	327
	J.P. Edelen, N.M. Cook, J.A. Einstein-Curtis RadiaSoft LLC, Boulder, Colorado, USA K.A. Brown, V. Schoefer BNL, Upton, New York, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Award Number DE-SC0019682 One of the fundamental challenges of using machine-learning-based inverse models for optics tuning in accelerators, particularly transfer lines, is the degenerate nature of the magnet settings and beam envelope functions. Moreover, it is challenging, if not impossible, to train a neural network to compute correct quadrupole settings from a given set of measurements due to the limited number of diagnostics available in operational beamlines. However, models that relate BPM readings to corrector settings are more forgiving, and have seen significant success as a benchmark for machine learning inverse models. We recently demonstrated that when comparing predicted corrector settings to actual corrector settings from a BPM inverse model, the model error can be related to errors in quadrupole settings. In this paper, we expand on that effort by incorporating inverse model errors as an optimization tool to correct for optics errors in a beamline. We present a toy model using a FODO lattice and then demonstrate the use of this technique for optics corrections in the AGS to RHIC transfer line at BNL.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP39
About •	Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 12 November 2022
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TUP40	Photon Polarization Switch at ALBA	331
	L. Torino, G. Benedetti, F.F.B. Fernández, U. Iriso, Z. Martí, J. Moldes, D. Yépez ALBA-CELLS, Cerdanyola del Vallès, Spain
	The polarization of the synchrotron radiation produced by a bending magnet can be selected by properly choosing the vertical emission angle. At beamlines this can be done by moving a slit to cut out unwanted polarization: this method is time consuming and not very reproducible. Another option is to fix the slit position and generate a local bump with the electron beam, and vary the emission angle at the source point such that the slit is illuminated with the desired polarization. At ALBA, we have implemented this option within the Fast Orbit Feedback, which allows to perform the angle switch in less than one minute without affecting the other beamlines. This report describes the implementation of this technique for the dipole beamline MISTRAL at the ALBA Synchrotron.
	Poster TUP40 [1.492 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP40
About •	Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 10 November 2022
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TUP41	Multi-Dimensional Feedforward Controller at MAX IV	335
	C. Takahashi, Á. Freitas, V. Hardion, M. Holz, M. Lindberg, M. Sjöström, H. Tarawneh MAX IV Laboratory, Lund University, Lund, Sweden
	Feedforward control loops are used in numerous applications to correct process variables. While feedforward control loops correct process variables according to expected behaviour of a system at any given set point, feedback loops require measurements of the output to correct deviations from the set point. At MAX IV, a generic multi-dimensional input and output feedforward controller was implemented using TANGO Control System. This paper describes the development and use cases of this controller for beam orbit and optics corrections at MAX IV.
	Poster TUP41 [1.597 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP41
About •	Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 15 September 2022
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TUP42	Fast Orbit Feedback Upgrade at SOLEIL	339
	R. Broucquart, N. Hubert SOLEIL, Gif-sur-Yvette, France
	In the framework of the SOLEIL II project, the diagnostics group must anticipate ahead of the dark period the upgrade of important system like the BPM electronics, the timing system end the Fast Orbit Feedback (FOFB). The FOFB is a complex system that is currently embedded in the BPM electronics modules (eBPM). A new flexible stand-alone platform is under conception to follow the future upgrades of surrounding equipment, and to allow the integration of future correction schemes. In this paper we will present the current status of technical decisions, tests and developments.
	Poster TUP42 [3.305 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP42
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 25 September 2022
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TUP43	Requirements and Design for the PETRA IV Fast Orbit Feedback System	343
	S.H. Mirza, A. Aloev, H.T. Duhme, B. Dursun, A. Eichler, S. Jabłoński, J. Klute, F. Ludwig, S. Pfeiffer, H. Schlarb, B. Szczepanski DESY, Hamburg, Germany G. Rehm HZB, Berlin, Germany
	PETRA IV is the upcoming low-emittance, 6 GeV, fourth- generation light source at DESY Hamburg. It is based upon a six-bend achromat lattice with additional beamlines as compared to PETRA III. Stringent stability of the electron beam orbit in the ring will be required to achieve diffraction- limited photon beam quality. In this regard, the requirements and the proposed topology of the global orbit feedback system are discussed for expected perturbations. An initial analysis based upon system requirements, design and modelling of the subsystems of the orbit feedback system is also presented
	Poster TUP43 [0.923 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP43
About •	Received ※ 14 September 2022 — Revised ※ 25 October 2022 — Accepted ※ 01 December 2022 — Issue date ※ 03 December 2022
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Paper

Title

Page

Commissioning of the Libera Beam Loss Monitoring System at SPEAR3

211

K. Tian, S. Condamoor, W.J. Corbett, N.L. Parry, J.A. Safranek, J.J. Sebek, F. Toufexis
SLAC, Menlo Park, California, USA

SPEAR3 is a third generation synchrotron radiation light source, which operates approximately 9 months each year with a very high reliability. The beam loss monitoring system in the storage ring has recently been upgrade to the modern Libera system from the original legacy hardware. During the initial stage of the new beam loss monitoring system deployment, it was proved to be useful for a new lattice commissioning at SPEAR3. In this paper, we will report the progress in the Libera system commissioning at SPEAR3 and present some first results.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP01

About •

Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 03 November 2022

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TUP02

Design of High Dynamic Range Preamplifiers for a Diamond-Based Radiation Monitor System

216

M. Marich, S. Carrato
University of Trieste, Trieste, Italy
L. Bosisio, A. Gabrielli, Y. Jin, L. Lanceri
INFN-Trieste, Trieste, Italy
G. Brajnik, G. Cautero, D. Giuressi
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
L. Vitale
Università degli Studi di Trieste, Trieste, Italy

Regardless of the different accelerator types (light sources like FELs or synchrotrons, high energy colliders), diagnostics is an essential element for both personnel and machine protection. With each update, accelerators become more complex and require an appropriate diagnostic system capable of satisfying multiple specifications, that become more stringent as complexity increases. This paper presents prototyping work towards a possible update of the readout electronics of a system based on single-crystal chemical vapor deposition (scCVD) diamond sensors, monitoring the radiation dose-rates in the interaction region of SuperKEKB, an asymmetric-energy electron-positron collider. The present readout units digitize the output signals from the radiation monitors, process them using an FPGA, and alert the accelerator control system if the radiation reaches excessive levels. The proposed updated version introduces a new design for the analog front end that overcomes its predecessor’s limits in dynamic range thanks to high-speed switches to introduce a variable gain in transimpedance preamplifiers, controlled by an ad-hoc developed FPGA firmware.

Poster TUP02 [1.292 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP02

About •

Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 16 October 2022

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TUP03

The Beam Loss Monitoring System after the LHC Long Shutdown 2 at CERN

220

M. Saccani, E. Effinger, W. Viganò, C. Zamantzas
CERN, Meyrin, Switzerland

Most of the LHC systems at CERN were updated during the Long Shutdown 2, from December 2018 to July 2022, to prepare the accelerator for High-Luminosity. The Beam Loss Monitoring system is a key part of the LHC’s instrumentation for machine protection and beam optimisation by producing continuous and reliable measurements of beam losses along the accelerator. The BLM system update during LS2 aims at providing better gateware portability to future evolutions, improving significantly the data rate in the back-end processing and the software efficiency, and adding remote command capability for the tunnel electronics. This paper first recalls the Run 1 and Run 2 BLM system achievements, then reviews the main changes brought during LS2, before focusing on the commissioning phase of Run 3 and future expectations.

Poster TUP03 [2.871 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP03

About •

Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 29 October 2022

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TUP04

Beam Loss Monitor for Polish Free Electron Laser (PolFEL): Design and Tests

225

R. Kwiatkowski, R. Nietubyc, J. Szewiński, D.R. Zaloga
NCBJ, Świerk/Otwock, Poland
A.I. Wawrzyniak
NSRC SOLARIS, Kraków, Poland

Funding: European Regional Development Fund in the framework of the Smart Growth Operational Programme and Regional Operational Programme for Mazowieckie Voivodeship.
The Beam Loss Monitor (BLM) system is primarily used for machine protection and is especially important in the case of high energy density of accelerated beam, when such a beam could cause serious damages due to uncontrolled loss. PolFEL linear accelerator is designed with the beam parameters, which made BLM an essential system for machine protection. The design of BLM system for PolFEL is composed of several scintillation probes placed along and around the accelerator. The paper reports on design and first tests of prototype detector, which is planned to be used for PolFEL project. The prototype was tested in NCBJ and SOLARIS, using radioactive calibration samples and linear electron accelerator as a sources. We also present results of numerical investigation of radiation generated due to interaction of fast electrons with accelerator components.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP04

About •

Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 19 October 2022

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TUP05

Experience with Machine Protection Systems at PIP2IT

229

A. Warner, M.R. Austin, L.R. Carmichael, J.-P. Carneiro, B.M. Hanna, E.R. Harms, M.A. Ibrahim, R. Neswold, L.R. Prost, R.A. Rivera, A.V. Shemyakin, J.Y. Wu
Fermilab, Batavia, Illinois, USA

Funding: * This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics
The PIP2IT accelerator was assembled in multiple stages in 2014 - 2021 to test concepts and components of the future PIP-II linac that is being constructed at Fermilab. In its final configuration, PIP2IT accelerated a 0.55 ms x 20 Hz x 2 mA H⁻ beam to 16 MeV. To protect elements of the beam line, a Machine Protection System (MPS) was implemented and commissioned. The beam was interrupted faster than 10 µs when excessive beam loss was detected. The paper describes the MPS architecture, methods of the loss detection, procedure of the beam interruption, and operational experience at PIP2IT.

Poster TUP05 [1.233 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP05

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Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 18 September 2022

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TUP06

Design and Simulation of Button Bpm for the Low Energy Storage Rings for Fourth Generration Light Sources

Z.Q. Luo, Z. Liu
HUST, Wuhan, People’s Republic of China

Compared to 3rd-generation light sources, 4th-generation SR light sources improve the brightness by reducing the emittance of the electron beam. To ensure the extremely low emittance of electron beams, it is necessary to provide more accurate beam position measurement. Based on the BPM of the 3rd generation light source (SSRF), the design of button BPM for a diffraction-limited storage ring in the low-energy region of the 4th-generation light source is presented in this paper. Here we have focused on optimizing the BPM in terms of the basic structure sizes, the wakefield caused by electron beam transport and the voltage signals picked up by the electrodes, etc. The optimization improves the measurement resolution of BPM together with matching the requirements of beam position measurement proposed by the low energy storage ring.

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TUP09

Design of the Beam Position Monitor for SOLEIL II

233

M. El Ajjouri, F. Alves, A. Gamelin, N. Hubert
SOLEIL, Gif-sur-Yvette, France

The Beam Position Monitors for the SOLEIL low emittance upgrade project are in the design phase. Efforts are put on the minimization of the heat load on the button by optimizing the longitudinal impedance and the BPM materials. To validate the mechanical design and tolerances a first prototype has been manufactured and controlled. This paper presents the mechanical design of the BPM, the metrology of the prototype and the lessons learned from this prototyping phase.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP09

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Received ※ 10 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 07 November 2022

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TUP10

Development of a New Measurement System for Beam Position Pickups in the LINAC and Beam Energy Measurement (Time of Flight) in the MEBT for Medaustron

238

M. Repovž, M. Cerv, C. Kurfürst, G. Muyan, S. Myalski, A. Pozenel, C. Schmitzer, M. Wolf
EBG MedAustron, Wr. Neustadt, Austria
A. Bardorfer, B. Baričevič, P. Paglovec, M. Škabar
I-Tech, Solkan, Slovenia

The MedAustron Ion Therapy Centre is a synchrotron-based particle therapy facility which delivers proton and carbon beams for clinical treatment. Currently, the facility treats roughly 40 patients per day and is improving its systems and workflows to further increase this number. MedAustron was commissioned and is operational without fully integrated systems for measurements of ’time of flight’ (beam energy) in the MEBT and beam position in the LINAC. This paper presents the newly developed system for these use cases, which will improve the overall commissioning and QA accuracy. It will unify the hardware used for the cavity regulation in the injector LLRF and the synchrotron LLRF. It will also be used for SYNC pickups, Schottky monitors and RF knock-out exciter. The new system is based on the CotS MicroTCA platform, which is controlled by the MedAustron Control System based on NI-PXIe. Currently it supports fiber-optic links (SFP+), but other links (e.g. EPICS, DOOCS) can be established. The modular implementation allows for connections to other components, such as motors, amplifiers, or interlock systems and will increase the robustness and maintainability of the accelerator.

Poster TUP10 [2.590 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP10

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Received ※ 04 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 28 September 2022

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TUP11

A Cryogenic RF Cavity BPM for the Superconducting Undulator at LCLS

241

C.D. Nantista, A.A. Haase, P. Krejcikpresenter
SLAC, Menlo Park, California, USA

The new superconducting undulator beamline at LCLS requires the BPMs to be operated at cryogenic temperatures alongside the undulator magnets. They are used for beam-based alignment of the undulator magnets and quadrupole and require submicron resolution to achieve good FEL performance. This is to be achieved with X-band RF cavity BPMs, as is done now on the permanent undulator beamline. However, operating the cavities at cryogenic temperatures introduces significant challenges. We review the changes in RF properties of the cavities that result from cooling and how the design is changed to compensate for this. This includes a novel approach for employing a rectangular cavity with split modes to separately measure the X and Y position without coupling.

Poster TUP11 [1.875 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP11

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Received ※ 11 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 11 November 2022

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TUP12

First Application of a Multiprocessing System-on-Chip BPM Electronics Platform at SwissFEL

245

B. Keil, R. Ditter, M. Gloor, G. Marinkovic, J. Purtschert
PSI, Villigen PSI, Switzerland

We have developed a new BPM electronics platform based on a MultiProcessing System-on-Chip (MPSoC). This contribution introduces the first application of the platform at the Paul Scherrer Institute (PSI), which is the cavity BPM system for the SwissFEL soft X-ray undulator beamline called ’Athos’ [1], where a larger number of systems are now operational. Measurement results and differences to the predecessor system will also be presented.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP12

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Received ※ 02 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 26 September 2022

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TUP13

Standard Button BPMs for PETRA IV

249

S. Strokov, M. Holz, G. Kube, D. Lipka, S. Vilcins
DESY, Hamburg, Germany

A new diffraction limited light source PETRA IV (DESY, Germany) with ultra-low emittance is currently being designed as an upgrade of the 3rd generation light source PETRA III. For transverse beam position measurements, beam position monitors (BPMs) will be used as an essential part of the beam diagnostic system. There will be a total of about 800 BPMs distributed along the 2.3 km storage ring. The inner diameter of the standard beam pipe, and therefore of most of the BPM chambers, will be 20 mm. The primary purpose of the systems is to provide high-resolution measurements of the transverse position of the electron beam. By specification, the impact of the mechanical tolerances on the position readings should be below 150 microns which is essential for the commissioning of the machine. To achieve this goal, the dependence of the accuracy of the beam position measurement on the tolerances of each manufactured part of the BPM was studied. This paper summarizes the development and optimization of each part of the BPM by using EM simulations performed with CST Studio Suite.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP13

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 01 October 2022

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TUP14

Transverse Emittance Measurement in Injector of RAON

E.H. Lim
Korea University Sejong Campus, Sejong, Republic of Korea
Y.S. Chung, G.D. Kim, J.W. Kwon
IBS, Daejeon, Republic of Korea
E.-S. Kim
KUS, Sejong, Republic of Korea

It is important to measure the transverse emittance, a beam characteristic for beam dynamics calculation. There are several methods for measuring transverse emittance. The emittance is calculated from the phase space distribution of the beam measured by Allison scanner. Quadrupole scan with wire scanner or multi wire scanner for RAON injector were also performed to compare with these data. RAON injector consists of ECR-IS, LEBT, RFQ, MEBT. Various diagnostic devices such as 8 Wire Scanners and 1 Allison Scanner were installed in beam transport line. Each diagnostic device was driven by PLC and the current was measured with microTCA-based DAQ system. EPICS was used to control the diagnostic system, and each device was driven and measured according to the sequencer module. In this paper, the measurement result of each diagnostic device and result of the emittance measurement on Ar-40 beam are presented.

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TUP15

New Gas Target Design for the HL-LHC Beam Gas Vertex Profile Monitor

252

H. Guerin, R. De Maria, R. Kersevan, B. Kolbinger, T. Lefèvre, M.T. Ramos Garcia, B. Salvant, G. Schneider, J.W. Storey
CERN, Meyrin, Switzerland
S.M. Gibson, H. Guerin
Royal Holloway, University of London, Surrey, United Kingdom

The Beam Gas Vertex (BGV) instrument is a novel non-invasive transverse beam profile monitor under development for the High Luminosity Upgrade of the Large Hadron Collider (HL-LHC). Its principle is based on the reconstruction of the tracks and vertices issued from beam-gas inelastic hadronic interactions. The instrument is currently in the design phase, and will consist of a gas target, a forward tracking detector installed outside the beam vacuum chamber and computing resources dedicated to event reconstruction. The transverse beam profile image will then be inferred from the spatial distribution of the reconstructed vertices. With this method, the BGV should be able to provide bunch-by-bunch measurement of the beam size, together with a beam profile image throughout the whole LHC energy cycle, and independently of the beam intensity. This contribution describes the design of the gas target system and of the gas tank of the future instrument.

Poster TUP15 [1.080 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP15

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Received ※ 06 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 12 December 2022

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TUP16

FOCUS: Fast Monte-CarlO Approach to Coherence of Undulator Sources

257

M. Siano
Università degli Studi di Milano, Milano, Italy
D. Butti, T. Lefèvre, S. Mazzoni, G. Trad
CERN, Meyrin, Switzerland
G. Geloni
EuXFEL, Schenefeld, Germany
U. Iriso, A.A. Nosych, L. Torino
ALBA-CELLS, Cerdanyola del Vallès, Spain
B. Paroli, M.A.C. Potenza
Universita’ degli Studi di Milano & INFN, Milano, Italy

"Fast Monte-CarlO approach to Coherence of Undulator Sources" (FOCUS) is a new GPU-based code to compute the transverse coherence of X-ray radiation from undulator sources. The code relies on scaled dimensionless quantities and analytic expressions of the electric field emitted by electrons in an undulator, obtained in the frequency domain under paraxial approximation (justified by the assumption of ultra-relativistic electrons) and free space propagation, with the addition of the resonance approximation. We describe the core structure of the code, which exploits GPUs for massively parallel computations. We validate our approach by direct comparison with SRW (Synchrotron Radiation Workshop) simulations. The benchmarks prove that FOCUS yields similar results with respect to SRW, while at the same time reducing the computation times by five orders of magnitude. Finally, we show examples of applications to beam size diagnostics. The aim of the code is to fast evaluating the transverse coherence properties of undulator X-ray radiation as a function of the electron beam parameters, and to support and help preparing more rigorous numerical simulations with traditional codes like SRW.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP16

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 19 September 2022

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TUP17

HL-LHC Beam Gas Fluorescence Studies for Transverse Profile Measurement

261

O. Sedláček, M. Ady, C. Castro Sequeiro, A.R. Churchman, S. Mazzonipresenter, G. Schneider, K. Sidorowski, R. Veness
CERN, Meyrin, Switzerland
P. Forck, S. Udrea
GSI, Darmstadt, Germany
M. Sameed
European Organization for Nuclear Research (CERN), Geneva, Switzerland
O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang
The University of Liverpool, Liverpool, United Kingdom
O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang
Cockcroft Institute, Warrington, Cheshire, United Kingdom

In a gas jet monitor, a supersonic gas curtain is injected into the beam pipe and interacts with the charged particle beam. The monitor exploits fluorescence induced by beam-gas interactions, thus providing a minimally invasive transverse profile measurement. Such a monitor is being developed as part of the High Luminosity LHC upgrade at CERN. As a preliminary study, the fluorescence cross section of relevant gases must be measured for protons at 450 GeV and 6.8 TeV (i.e. the LHC injection and flat top energies). In these measurements, neon, or alternatively nitrogen gas, will be injected into the LHC vacuum pipe by a regulated gas valve to create an extended pressure bump. This work presents the optical detection system that was installed in 2022 in the LHC to measure luminescence cross-section and horizontal beam profile. Preliminary measurements of background light and first signals are presented in this paper.

Poster TUP17 [0.673 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP17

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 14 September 2022 — Issue date ※ 21 November 2022

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TUP18

High-Resolution Interferometric Beam-Size Monitor For Low-Intensity Beams

265

B. Alberdi-Esuain, J.-G. Hwang, T. Kamps
HZB, Berlin, Germany
T. Kamps
HU Berlin, Berlin, Germany

Plasma-based accelerator technology is reaching a mature state, where applications of the beam for medical sciences, imaging, or as an injector for a future large-scale accelerator-driven light source become feasible. Particularly, the requirements for beam injection into a storage-ring-based light source are very strict with regards to beam quality and reliability. A non-invasive diagnostics greatly helps to reduce the commissioning time of the machine. We present a device suitable for online, non-destructive monitoring of the transverse spot size of the injected beam. In order to measure lateral beam sizes with a few-micrometer resolution, the technique uses an interferometric regime of coherent synchrotron radiation that is enabled by a sub-femtosecond short bunch-length. Simulations of the photon flux and the retrieval of the beam spot-size are performed for different bandwidth filters in order to define the bandwidth acceptance. Results show the potential of the proposed system that achieves precise retrieval of the complex degree of coherence at an extremely low photon intensity similar to those expected towards the plasma-acceleration injectors.

Poster TUP18 [9.961 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP18

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 03 December 2022

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TUP19

Visible Range Polarized Imaging for High Resolution Transverse Beam Size Measurement at SOLEIL

269

M. Labat, A. Bence, A. Berlioux, B. Capitanio, G. Cauchon, J. Da Silva, N. Hubertpresenter, D. Pédeau, M. Thomasset
SOLEIL, Gif-sur-Yvette, France

SOLEIL storage ring is presently equipped with three diagnostics beamlines: two in the X-ray range (pinhole cameras) and one in the visible range. The visible range beamline relies on a slotted copper mirror extracting the synchrotron radiation from one of the ring dipoles. The extracted radiation is then transported down to a dedicated hutch in the experimental hall. Up to now, this radiation was split into three branches for rough monitoring of the beam transverse stability, bunch length measurements and filling pattern measurements. In the framework of SOLEIL’s upgrade, we now aim at developing a new branch for high resolution beam size measurement using polarized imaging. This work presents the various modifications recently achieved on the beamline to reach this target, including a replacement of the extraction mirror, and preliminary results towards transverse beam size measurement.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP19

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Received ※ 09 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 25 September 2022

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TUP20

Correction for Systematic Errors in Transverse Phase Space Measurements at PITZ

273

C.J. Richard, Z. Aboulbanine, G.D. Adhikari, N. Aftab, P. Boonpornprasert, G.Z. Georgiev, M. Groß, A. Hoffmann, M. Krasilnikov, X.-K. Li, A. Lueangaramwong, R. Niemczyk, H.J. Qian, F. Stephan, G. Vashchenko, T. Weilbach
DESY Zeuthen, Zeuthen, Germany

Funding: This work was supported by the European XFEL research and development program
The Photo Injector Test Facility at DESY in Zeuthen (PITZ) characterizes and optimizes electron sources for use at FLASH and European XFEL. AT PITZ, the transverse phase space is measured using a single slit scan and scintillator screen method. With the trend in photoinjectors towards lower current and emittance, these measurements become increasingly influenced by systematic errors including camera resolution and scintillator response due to smaller spot sizes. This study investigates the effects and corrections of the systematic errors for phase space measurements at PITZ.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP20

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 01 November 2022

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TUP21

Scintillator Nonproportionality Studies at PITZ

277

A.I. Novokshonov, G. Kube, S. Strokov
DESY, Hamburg, Germany
Z. Aboulbanine, G.D. Adhikari, N. Aftab, P. Boonpornprasert, G.Z. Georgiev, J. Good, M. Groß, C. Koschitzki, M. Krasilnikov, X. Li, O. Lishilin, A. Lueangaramwong, D. Melkumyan, F. Mueller, A. Oppelt, H.J. Qian, F. Stephan, G. Vashchenko, T. Weilbach
DESY Zeuthen, Zeuthen, Germany

A standard technique to measure beam profiles in linear accelerators are screen monitors using scintillating screens. This technique is used e.g. at the European XFEL in order to overcome coherence effects in case of OTR usage [*]. During the XFEL commissioning it was found out that screens based on LYSO:Ce as scintillating material revealed a nonproportional light output [**]. Reason for it is the high particle beam density. As consequence it was decided to exchange LYSO:Ce by GAGG:Ce scintillators because the excitation carriers can rapidly transfer their energy to excited states of gadolinium, and a rapid migration of this energy among the Gd sub-lattice is expected. Driven by the observations at XFEL a series of measurements was started to investigate the properties of various scintillator materials (LYSO:Ce, YAP:Ce, YAG:Ce, LuAG:Ce and GAGG:Ce). The last measurement campaign was carried out at PITZ which allows to operate at higher beam charge and lower electron energy compared to the XFEL. The present work summarizes the results of these measurements.
* S.Wesch and B.Schmidt, in Proc. DIPAC’11, Hamburg, WEOA01, pp. 539-543.
** G.Kube, A.Novokshonov, S.Liu, M.Scholz, in Proc. FEL’19, Hamburg, WEB01, pp. 301-306.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP21

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Received ※ 11 September 2022 — Revised ※ 13 September 2022 — Accepted ※ 11 October 2022 — Issue date ※ 15 October 2022

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TUP22

Linear Approach to Space Charge Calculations Proton Testbeam at KAHVELab (PTAK)

G. Unel
UCI, Irvine, California, USA
A. Adiguzel, S. Esen
Istanbul University, Istanbul, Turkey
H. Cetinkaya
Dumlupinar University, Faculty of Science and Arts, Kutahya, Turkey
S. Ogur, S. Ogur
CERN, Meyrin, Switzerland
E.V. Ozcan
Bogazici University, Bebek / Istanbul, Turkey

Funding: This study is supported by The Scientific and Technological Research Council of Turkey (TUBITAK), Project No: 119M774
In Kandilli Detector, Accelerator, and Instrumentation Laboratory, a proton accelerator system is produced using local resources consists of 2 types of ion sources, a low energy beam transfer line (LEBT)and a 1-meter-long RFQ that will operate at 800 MHz. A bespoke Python program calculated the space charge effect created by internal interactions of the beam along the line before entering the RFQ. The results were validated with CERN’s TRAVEL program. The growth of the beam with a 1.4 mA current value in the transverse axis due to the effect of space charge has been calculated with a maximum margin of error of 4% for different current and frequency values. Studies using different emittance calculation methods on emittance growth due to space charge dominance continues to be developed. In addition, studies on comparing new methods’ findings with outputs of A Space Charge Tracking Algorithm (ASTRA) and RF-Track Programs are ongoing and aim to finalize by the end of 2023.

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TUP23

Commissioning of the Timing System at ESS

281

N. Milas, G.S. Fedel, A.A. Gorzawskipresenter, J.J. Jamróz, J.P.S. Martins
ESS, Lund, Sweden

The European Spallation Source (ESS), currently under construction and initial commissioning in Lund, Sweden, will be the brightest spallation neutron source in the world, when its driving proton linac achieves the design power of 5 MW at 2 GeV. Such a high power requires production, efficient acceleration, and almost no-loss transport of a high current beam, thus making design and beam commissioning of this machine challenging. The commissioning runs of 2021 and early 2022 were the first where the master timing system for the linac was fully available. As a consequence of that, the beam actuators and beam monitoring equipment relied fully on timing events sent accross the machine, not only to be triggered to act but also to get the configuration. In this paper, we describe the timing system as available today, present how we define and create the beam pulses using the available parameters. We also present planned future upgrades and other outlook for the system.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP23

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 12 October 2022

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TUP25

Simulation and Measurements of the Fast Faraday Cups at GSI UNILAC

286

R. Singh, P. Forck, T. Reichert, A. Reiter
GSI, Darmstadt, Germany
S. Klaproth
THM, Friedberg, Germany
G.O. Rodrigues
IUAC, New Delhi, India

Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05P21RORB2. Joint Project 05P2021 - R&D Accelerator (DIAGNOSE)
The longitudinal charge profiles of the high intensity heavy ion beam accelerated at the GSI UNILAC upto 11.4 MeV/u can differ significantly in consecutive macro-pulses. Variations in bunch shape and mean energy were also observed within a single macro-pulse. In order to have an accurate and fast determination of bunch shape and its evolution within a macro-pulse, a study of fast Faraday Cup designs is underway at GSI. In this contribution, we present CST particle in cell (PIC) simulations of radially coupled co-axial Fast Faraday Cup (RCFFC) and conventional axially coupled FFC (ACFFC) design. The simulation results are compared to the measurements performed under comparable beam conditions primarily with RCFFCs. A rather large impact of secondary electron emission is observed in simulations and experiments. The biasing of the FFC central electrode as a mitigation mechanism on the measured profiles is discussed.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP25

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Received ※ 15 September 2022 — Revised ※ 17 September 2022 — Accepted ※ 25 October 2022 — Issue date ※ 02 November 2022

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TUP26

Study on Beam Length Measurement Technique Using Highspeed Oscilloscope

HS. Wang
SSRF, Shanghai, People’s Republic of China

In order to study the nonlinear beam dynamics in the storage ring, the SSRF BI group developed the software package HOTPCAP, which is used to extract the bunch-by-bunch 3D beam position information from the BPM electrode signal. In order to enhance the function of this software, we studied the beam length extraction method from digitized BPM electrodes signal. By analyzing the signal spectrum distribution for each bunch and each turn and gaussian fitting in frequency domain, bunch length information be extracted. Compared with the traditional longitudinal diagnostic tool streak camera, this method can obtain and store measurement data as long as ten ms while maintaining the time resolution of ps level, which is a powerful diagnostics tool for study of injection transient stage and longitudinal instability. In this paper, the hardware and software architecture of the system and the beam experimental results obtained during the third harmonic cavity commissioning are introduced.

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TUP28

Coherent Difraction Radiation for Longitudinal Electron Beam Characteristics

291

R. Panaś
NSRC SOLARIS, Kraków, Poland
A. Curcio
CLPU, Villamayor, Spain
K. Łasocha
Jagiellonian University, Kraków, Poland

For the needs of diagnostics of the longitudinal electron beam characteristics at the first Polish free electron laser (PolFEL) project, a Coherent Diffraction Radiation (CDR) system is being developed and tested. It will allow for nondestructive bunch length measurement based on the power balance of CDR radiation collected by Schottky diodes in different ranges of sub-THz radiation. The first tests and measurements will be performed at the end of the Solaris synchrotron injector linac, where the beam profile is already known from previous studies. In addition the camera system with automatic focus was developed and tested. In this contribution the theoretical background of the measurement, calculations and first experimental steps will be presented.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP28

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 13 September 2022

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TUP29

ZnO(In) Scintillation Light Spectra Investigation for Heavy Ion Detector Application

294

M. Saifulin, C. Trautmann
TU Darmstadt, Darmstadt, Germany
P. Boutachkov, M. Saifulin, C. Trautmann, B. Walasek-Höhne
GSI, Darmstadt, Germany
E.I. Gorokhova
GOI, St Petersburg, Russia
P. Rodnyi, I.D. Venevtsev
SPbPU, St. Petersburg, Russia

Funding: DLR financed this research within the framework of the ERA. Net RUS Plus Project RUS_ST2017-051
ZnO-based ceramics are known as promising scintillators exhibiting light emission in the ultraviolet (UV) spectral region (~390 nm) and ultrafast decay times (<1 ns). They are of great interest for applications in scintillation counters and screens at high-energy heavy ion accelerators. In this contribution, the deterioration of scintillating properties of ZnO-based ceramics subjected to heavy ion exposure at high doses is investigated. The scintillation light spectra of ZnO(In) as a function of fluence for 4.8 MeV/u 48Ca and 197Au ions were studied. We observed that the deterioration of the scintillation intensity with increasing fluence follows the Birks-Black model.
* The results presented in this contribution are based on the work performed before the 24th of February, 2022.
** m.saifulin@gsi.de (corresponding author)

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP29

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Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 01 November 2022

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TUP30

Beam Intensity Measurement in ELENA Using Orbit Pick-Ups

296

O. Marqversen, D. Alves
CERN, Meyrin, Switzerland

A bunched beam intensity measurement system for the CERN Extra Low ENergy Antiproton (ELENA) ring, using a cylindrical shoe-box electrostatic pick-up from the existing orbit system [1], is presented. The system has been developed to measure very challenging beam cur-rents, as low as 200nA corresponding to intensities of the order of 10⁷ antiprotons circulating with a relativistic beta of the order of 10-2. In this work we derive and show that the turn-by-turn beam intensity is proportional to the baseline of the sum signal and that, despite the AC-coupling of the system, the installed front-end electronics, based on a charge amplifier, not only guarantees the preservation of the bunch shape (up to a few tens of MHz), but also allows for an absolute calibration of the system. In addition, the linearity of the intensity measurements and their inde-pendence with respect to average beam position is evalu-ated using a standard electromagnetic simulation tool. Finally, experimental measurements throughout typical antiproton deceleration cycles are presented and their accuracy and precision are discussed.

Poster TUP30 [1.102 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP30

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 01 November 2022

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TUP31

The Cryogenic Current Comparator at CRYRING@ESR

300

L. Crescimbeni, D.M. Haider, A. Reiter, M. Schwickert, T. Sieber, T. Stöhlker
GSI, Darmstadt, Germany
H. De Gersem, N. Marsic, W.F.O. Müller
TEMF, TU Darmstadt, Darmstadt, Germany
M. Schmelz, R. Stolz, V. Zakosarenko
IPHT, Jena, Germany
F. Schmidl
FSU Jena, Jena, Germany
T. Stöhlker
IOQ, Jena, Germany
T. Stöhlker, V. Tympel
HIJ, Jena, Germany
V. Zakosarenko
Supracon AG, Jena, Germany

Funding: Work supported by the BMBF under contract No. 05P21SJRB1.
The Cryogenic Current Comparator (CCC) at the heavy-ion storage ring CRYRING@ESR at GSI provides a calibrated non-destructive measurement of beam current with a resolution of 10 nA or better. With traditional diagnostics in storage rings or transfer lines a non-interceptive absolute intensity measurement of weak ion beams (< 1 µA) is already challenging for bunched beams and virtually impossible for coasting beams. Therefore, at these currents the CCC is the only diagnostics instrumentation that gives reliable values for the beam intensity independently of the measured ion species and without the need for tedious calibration procedures. Herein, after a brief review of the diagnostic setup, an overview of the operation of the CCC with different stored ion beams at CRYRING is presented. The current reading of the CCC is compared to the intensity signal of various standard instrumentations including a Parametric Current Transformer (PCT), an Ionization Profile Monitor (IPM) and the Beam Position Monitors (BPMs). It was shown that the CCC is a reliable instrument to monitor changes of the beam current in the range of nA.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP31

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Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 19 November 2022

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TUP32

Differential Current Transformer for Beam Charge Monitoring in Noisy Environments

304

H. Maesaka, T. Inagaki
RIKEN SPring-8 Center, Hyogo, Japan
H. Dewa, T. Inagaki, H. Maesaka, K. Yanagida
JASRI, Hyogo, Japan
K. Ueshima
QST, Sendai, Miyagi, Japan

We developed a differential current transformer (CT) for electron beam charge measurement in noisy environments, such as near high-power pulse sources. This CT has four pickup wires coiled at equal intervals (90 deg.) on a toroidal core and each coil is wound for two turns. The midpoint of the coil is connected to the body ground so that a balanced differential signal is generated at both ends. A beam pipe with a ceramics insulation gap is inserted into the toroidal core to obtain a signal from a charged-particle beam. The four pairs of signals are transmitted through a CAT6 differential cable and fed into differential amplifiers. The common-mode noise from the noisy ground at the CT is canceled out by the amplifier. The four signals are then summed and digitized by an AD converter. We produced differential CTs and installed them into the new injector linac of NewSUBARU (*). Before the installation, the frequency response was measured in a laboratory and a flat response of up to 100 MHz was obtained as expected. Common-mode noise cancellation was also confirmed at NewSUBARU and the CTs have been utilized for beam charge monitoring stably.
*: T. Inagaki et al., ’Construction of a Compact Electron Injector Using a Gridded RF Thermionic Gun and a C-Band Accelerator’, in Proc. IPAC’21, pp. 2687-2689. doi:10.18429/JACoW-IPAC2021-WEPAB039

Poster TUP32 [1.393 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP32

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 26 October 2022

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TUP34

LHC Schottky Spectrum from Macro-Particle Simulations

308

C. Lannoy, D. Alves, N. Mounet
CERN, Meyrin, Switzerland
C. Lannoy, T. Pieloni
EPFL, Lausanne, Switzerland
K. Łasocha
Jagiellonian University, Kraków, Poland

We introduce a method for building Schottky spectra from macro-particle simulations performed with the PyHEADTAIL code, applied to LHC beam conditions. In this case, the use of a standard Fast Fourier Transform (FFT) algorithm to recover the spectral content of the beam becomes computationally intractable memory-wise, because of the relatively short bunch length compared to the large revolution period. This would imply having to handle an extremely large amount of data for performing the FFT. To circumvent this difficulty, a semi-analytical method was developed to compute efficiently the Fourier transform. The spectral content of the beam is calculated on the fly along with the macro-particle simulation and stored in a compact manner, independently from the number of particles, thus allowing the processing of one million macro-particles in the LHC, over 10’000 revolutions, in a few hours, on a regular computer. The simulated Schottky spectrum is then compared against theoretical formulas and measurements of Schottky signals previously obtained with lead ion beams in the LHC.

Poster TUP34 [1.864 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP34

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Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 01 December 2022

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TUP35

First RF Phase Scans at the European Spallation Source

313

Y. Levinsen, R.A. Baron, E.M. Donegani, M. Eshraqi, A. Garcia Sosa, H. Hassanzadegan, B. Jones, N. Milas, R. Miyamoto, D. Noll, I. Vojskovic, R.H. Zeng
ESS, Lund, Sweden
M. Akhyani
EPFL, Lausanne, Switzerland
I. Bustinduy
ESS Bilbao, Zamudio, Spain
F. Grespan
INFN/LNL, Legnaro (PD), Italy

The installation and commissioning of the European Spallation Source is currently underway at full speed, with the goal to be ready for first neutron production by end of 2024. This year we accelerated protons through the first DTL tank. This included the RFQ, 3 buncher cavities in the medium energy beam transport as well as the DTL tank itself as RF elements. At the end of the DTL tank we had a Faraday cup acting as the effective beam stop. This marks the first commissioning when RF matching is required for beam transport. In this paper we discuss the phase scan measurements and analysis of the buncher cavities and the first DTL tank.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP35

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Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 03 October 2022

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TUP36

Beam Characterization of Slow Extraction Measurement at GSI-SIS18 for Transverse Emittance Exchange Experiments

318

J. Yang, P. Boutachkov, P. Forck, T. Milosic, R. Singh, S. Sorge
GSI, Darmstadt, Germany

Funding: This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under GA No 101004730.
The quality of slowly, typically several seconds, extracted beams from the GSI synchrotron SIS18 is characterized with respect to the temporal beam stability, the so-called spillμstructure on the 100 µs scale. A pilot experiment was performed utilizing transverse emittance exchange to reduce the beam size in the extraction plane, and the improvement of spillμstructure was found. Important beam instrumentation comprises an Ionization Profile Monitor for beam profile measurement inside the synchrotron and a plastic scintillator at the external transfer line for ion counting with up to several 10⁶ particles per second and 20 µs time slices. The performant data acquisition systems, including a scaler and a fast Time-to-Digital Converter (TDC), allow for determining the spill quality. The application of the TDC in the measurement and related MAD-X simulations are discussed.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP36

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Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 11 October 2022

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TUP38

Deep Neural Network for Beam Profile Classification in Synchrotron

323

M. Piekarski
NSRC SOLARIS, Kraków, Poland

Funding: The presented work has been achieved in collaboration with AGH University of Science and Technology in Kraków as a part of a PhD thesis.
The main goal of NSRC SOLARIS is to provide scientific community with high quality synchrotron light. To achieve this, it is necessary to constantly monitor many subsystems responsible for beam stability and to analyze data about the beam itself from various diagnostic beamlines. In this work a deep neural network for transverse beam profile classification is proposed. Main task of the system is to automatically assess and classify transverse beam profiles based solely on the evaluation of the beam image from the Pinhole diagnostic beamline at SOLARIS. At the present stage, a binary assignment of each profile is performed: stable beam operation or unstable beam operation / no beam. Base model architecture consists of a pre-trained convolutional neural network followed by a densely-connected classifier and the system reaches accuracy at the level of 90%. The model and the results obtained so far are discussed, along with plans for future development.

Poster TUP38 [0.376 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP38

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Received ※ 30 August 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 October 2022

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TUP39

Neural Network Inverse Models for Implicit Optics Tuning in the AGS to RHIC Transfer Line

327

J.P. Edelen, N.M. Cook, J.A. Einstein-Curtis
RadiaSoft LLC, Boulder, Colorado, USA
K.A. Brown, V. Schoefer
BNL, Upton, New York, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Award Number DE-SC0019682
One of the fundamental challenges of using machine-learning-based inverse models for optics tuning in accelerators, particularly transfer lines, is the degenerate nature of the magnet settings and beam envelope functions. Moreover, it is challenging, if not impossible, to train a neural network to compute correct quadrupole settings from a given set of measurements due to the limited number of diagnostics available in operational beamlines. However, models that relate BPM readings to corrector settings are more forgiving, and have seen significant success as a benchmark for machine learning inverse models. We recently demonstrated that when comparing predicted corrector settings to actual corrector settings from a BPM inverse model, the model error can be related to errors in quadrupole settings. In this paper, we expand on that effort by incorporating inverse model errors as an optimization tool to correct for optics errors in a beamline. We present a toy model using a FODO lattice and then demonstrate the use of this technique for optics corrections in the AGS to RHIC transfer line at BNL.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP39

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Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 12 November 2022

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TUP40

Photon Polarization Switch at ALBA

331

L. Torino, G. Benedetti, F.F.B. Fernández, U. Iriso, Z. Martí, J. Moldes, D. Yépez
ALBA-CELLS, Cerdanyola del Vallès, Spain

The polarization of the synchrotron radiation produced by a bending magnet can be selected by properly choosing the vertical emission angle. At beamlines this can be done by moving a slit to cut out unwanted polarization: this method is time consuming and not very reproducible. Another option is to fix the slit position and generate a local bump with the electron beam, and vary the emission angle at the source point such that the slit is illuminated with the desired polarization. At ALBA, we have implemented this option within the Fast Orbit Feedback, which allows to perform the angle switch in less than one minute without affecting the other beamlines. This report describes the implementation of this technique for the dipole beamline MISTRAL at the ALBA Synchrotron.

Poster TUP40 [1.492 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP40

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Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 10 November 2022

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TUP41

Multi-Dimensional Feedforward Controller at MAX IV

335

C. Takahashi, Á. Freitas, V. Hardion, M. Holz, M. Lindberg, M. Sjöström, H. Tarawneh
MAX IV Laboratory, Lund University, Lund, Sweden

Feedforward control loops are used in numerous applications to correct process variables. While feedforward control loops correct process variables according to expected behaviour of a system at any given set point, feedback loops require measurements of the output to correct deviations from the set point. At MAX IV, a generic multi-dimensional input and output feedforward controller was implemented using TANGO Control System. This paper describes the development and use cases of this controller for beam orbit and optics corrections at MAX IV.

Poster TUP41 [1.597 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP41

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Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 15 September 2022

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TUP42

Fast Orbit Feedback Upgrade at SOLEIL

339

R. Broucquart, N. Hubert
SOLEIL, Gif-sur-Yvette, France

In the framework of the SOLEIL II project, the diagnostics group must anticipate ahead of the dark period the upgrade of important system like the BPM electronics, the timing system end the Fast Orbit Feedback (FOFB). The FOFB is a complex system that is currently embedded in the BPM electronics modules (eBPM). A new flexible stand-alone platform is under conception to follow the future upgrades of surrounding equipment, and to allow the integration of future correction schemes. In this paper we will present the current status of technical decisions, tests and developments.

Poster TUP42 [3.305 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP42

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 25 September 2022

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TUP43

Requirements and Design for the PETRA IV Fast Orbit Feedback System

343

S.H. Mirza, A. Aloev, H.T. Duhme, B. Dursun, A. Eichler, S. Jabłoński, J. Klute, F. Ludwig, S. Pfeiffer, H. Schlarb, B. Szczepanski
DESY, Hamburg, Germany
G. Rehm
HZB, Berlin, Germany

PETRA IV is the upcoming low-emittance, 6 GeV, fourth- generation light source at DESY Hamburg. It is based upon a six-bend achromat lattice with additional beamlines as compared to PETRA III. Stringent stability of the electron beam orbit in the ring will be required to achieve diffraction- limited photon beam quality. In this regard, the requirements and the proposed topology of the global orbit feedback system are discussed for expected perturbations. An initial analysis based upon system requirements, design and modelling of the subsystems of the orbit feedback system is also presented

Poster TUP43 [0.923 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP43

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Received ※ 14 September 2022 — Revised ※ 25 October 2022 — Accepted ※ 01 December 2022 — Issue date ※ 03 December 2022

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