IBIC2022 - Table of Session: MOP (Monday Poster Session)

Paper	Title	Page
MOP01	SLS 2.0 – Status of the Diagnostics	15
	C. Ozkan Loch, R. Ischebeck, N. Samadipresenter, A.M.M. Stampfli, J. Vila Comamala PSI, Villigen PSI, Switzerland
	This poster will give an overview of the diagnostics development for SLS 2.0. Details on the beam size monitors in the storage ring, the screen monitors for the booster to ring transfer line, and beam loss monitors for the linac and storage ring will be presented. Test results carried out at the SLS will also be presented. BPMs and feedback systems are not covered in this contribution.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP01
About •	Received ※ 06 September 2022 — Revised ※ 13 September 2022 — Accepted ※ 18 September 2022 — Issue date ※ 01 December 2022
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MOP02	An Optical Diagnostic Beamline for the Bessy II Booster	19
	T. Atkinson, J.-G. Hwang, G. Rehm, M. Ries, G. Schiwietz, S. Wiese HZB, Berlin, Germany
	As part of the global refurbishment of the injector at BESSY II, a new optical beamline has been installed in the booster. This paper covers the conceptual design: incorporating the beamline into an operational facility without downtime, the simulation and expectations of the optical transport line, mechanical installation and commissioning with beam. These first results with the present beam delivery system have already achieved source point imaging and bunch length measurements using a fast diode. With the additional PETRA cavity installed for this booster upgrade and connection to acquire RF power in the 2022 summer shutdown planned, the bunch length diagnostics are critical. The beamline will also undergo a final mechanical upgrade and then see the installation of a streak camera.
	Poster MOP02 [0.975 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP02
About •	Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 December 2022 — Issue date ※ 12 December 2022
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MOP03	Status Overview of the HESR Beam Instrumentation	23
	C. Böhme FZJ, Jülich, Germany A.J. Halama, V. Kamerdzhiev, G.R. Rupsch GSI, Darmstadt, Germany
	The High Energy Storage Ring (HESR), within the FAIR project, will according to current planning provide anti-proton beams for PANDA and heavy ion beams for a.o. SPARC. With the beam instrumentation devices envisaged in larger quantities, e.g. BPM and BLM, testing is well underway. Other beam instrumentation instruments like Viewer are in late production stage, Scraper is being tested and for the IPM the 1st of series production has started. An overview of the status of the work package beam instrumentation will be presented as well as test bench results of already produced instruments.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP03
About •	Received ※ 08 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 28 September 2022
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MOP05	Fiber Bragg Grating Sensors as Beam-Induced Heating Monitor for the Central Beam Pipe of CMS	28
	F. Fienga, G. Breglio, A. Irace, V.R. Marrazzo, L. Sitopresenter University of Napoli Federico II, Napoli, Italy N. Beni, G. Breglio, S. Buontempo, F. Carra, F. Fienga, F. Giordano, V.R. Marrazzo, B. Salvant, L. Sitopresenter, Z. Szillasi CERN, Meyrin, Switzerland N. Beni, Z. Szillasi Atomki, Debrecen, Hungary S. Buontempo INFN-Napoli, Napoli, Italy
	The passage of a high-intensity particle beam inside accelerator components generates heating, potentially leading to degradation of the accelerator performance or damage to the component itself. It is therefore essential to monitor such beam-induced heating in accelerators. This paper showcases the capabilities of iPipe, which is a set of Fiber Bragg Grating sensors stuck on the inner beam pipe of the Compact Muon Solenoid (CMS) experiment installed in the CERN Large Hadron Collider (LHC). In this study, the wavelength shift, linked directly to the temperature shift, is measured and is compared with the computed dissipated power for a set of LHC fills. Electromagnetic and thermal simulations were also coupled to predict the beam-induced temperature increase along the beam pipe. These results further validate the sensing system and the methods used to design accelerator components to mitigate beam-induced heating.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP05
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 September 2022
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MOP07	Beam Instrumentation Performance During Commissioning of the ESS RFQ, MEBT and DTL	32
	T.J. Shea, R.A. Baron, C.S. Derrez, E.M. Donegani, V. Grishin, H. Hassanzadegan, I. Kittelmann, H. Kocevar, N. Milas, D. Noll, H.A. Silva, R. Tarkeshian, C.A. Thomas ESS, Lund, Sweden I. Bustinduy ESS Bilbao, Zamudio, Spain M. Ferianis Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy T. Papaevangelou, L. Seguí CEA-IRFU, Gif-sur-Yvette, France
	In late 2021 through mid 2022, the first protons were accelerated and transported through the European Spallation Source (ESS) Radio Frequency Quadrupole and Medium Energy Transport line at 3.6 MeV, and finally through the first Drift Tube Linac tank at 21 MeV. To enable these achievements, the following beam instrumentation systems were deployed: Ion Source power supply monitors, beam chopping systems, Faraday Cups, Beam Current Monitors (BCM) and Beam Position Monitors (BPM) that also measured phase. Additional systems were deployed for dedicated studies, including Wire Scanners, a slit and grid Emittance Measurement Unit, neutron Beam Loss Monitors and fast BCM and BPM systems. The instrumentation deployment is the culmination of efforts by a partnership of the ESS beam diagnostics section, multiple ESS groups and institutes across the globe. This paper summarizes the beam tests that characterized the performance of the instrumentation systems and verified the achievement of commissioning goals.
	Poster MOP07 [5.388 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP07
About •	Received ※ 30 August 2022 — Accepted ※ 15 September 2022 — Issue date ※ 07 November 2022
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MOP08	Development of a Waveguide BPM System	37
	A. Lyapin, W. Shields JAI, Egham, Surrey, United Kingdom
	Funding: This work was supported by STFC Follow on Fund grant number ST/T003413/1 A mode-selective waveguide beam position monitor is under development. It is aimed primarily at electron linacs, although with its low impedance and wide bandwidth it could find alternative applications. In this paper we go over the design of the waveguide BPM system including the sensor and analog electronics, consider requirements to the digital processing and present some simulated results.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP08
About •	Received ※ 09 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 29 November 2022
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MOP09	Towards Higher Stability in Large Scale Cavity BPM Systems	40
	A. Lyapin, M.S. McCallum JAI, Egham, Surrey, United Kingdom A. Aryshev, K.O. Kruchinin KEK, Ibaraki, Japan
	Funding: This work is supported by Royal Society International Exchanges Grant number IEC\R3\213050 In this contribution we consider a possible solution to long-term stability issues common in cavity BPM systems. The method will see a wider use active in-situ calibration systems injecting a tone into the measurement channel. We plan to compensate the bulk of the beam generated signal and so potentially extend the dynamic range of the electronics, reduce the amount of wakefield seen by the beam. The signal matching the real beam can then be used for mimicking the beam and calibrating out any drifts of the whole sensing and processing chain. We present the concept, give some simulated results and consider possible hardware solutions.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP09
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 12 November 2022
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MOP10	Removing Noise in BPM Measurements with Variational Autoencoders	43
	J.P. Edelen, J.A. Einstein-Curtis, C.C. Hall, M.J. Henderson RadiaSoft LLC, Boulder, Colorado, USA A.L. Romanov Fermilab, Batavia, Illinois, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0021699. Noise in beam measurements is an ever-present challenge in accelerator operations. In addition to the challenges presented by hardware and signal processing, new operational regimes, such as ultra-short bunches, create additional difficulties in routine beam measurements. Techniques in machine learning have been successfully applied in other domains to overcome challenges inherent in noisy data. Variational autoencoders (VAEs) are shown to be capable of removing significant leevels of noise. A VAE can be used as a pre-processing tool for noise removal before the de-noised data is analyzed via other methods, or the VAE can be directly used to make beam dynamics measurements. Here we present the use of VAEs as a tool for addressing noise in BPM measurements.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP10
About •	Received ※ 29 August 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 24 November 2022
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MOP12	Production of Cavity Beam Position Monitors for the ARES Accelerator at DESY	47
	D. Lipka, M. Holz, S. Vilcins DESY, Hamburg, Germany
	The SINBAD facility (Short and INnovative Bunches and Accelerators at DESY) hosts various experiments in the field of production of ultra-short electron bunches and novel high gradient acceleration techniques. The SINBAD facility, also called ARES (Accelerator Research Experiment at SINBAD), is a conventional S-band linear RF accelerator allowing the production of low charge ultra-short electron bunches within a range between 0.5 pC and 1000 pC. The positions of the low charge bunches will be detected by cavity beam position monitors. The principal design is based on the experience from the EU-XFEL cavity beam position monitors. It consists of a 316 LN stainless steel body with a design loaded quality factor of 70, a resonance frequency of 3.3 GHz and a relative wide gap of 15 mm to reach a high peak position sensitivity of 4.25 V/(nC mm). This poster covered, the manufacture of the individual mechanical parts, as well as presents the special features in the manufacture of customer designed UHV feedthroughs.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP12
About •	Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 06 November 2022
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MOP13	Test and Measurements Results of the Pilot Tone Front End Industrialization for Elettra 2.0	51
	G. Brajnik, R. De Monte Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy M. Cargnelutti, U. Dragonja, P. Leban, P. Paglovec, B. Repič, A. Vigali I-Tech, Solkan, Slovenia
	Elettra 2.0 will be the low-emittance upgrade of the present machine, a third-generation lightsource based in Trieste, Italy. The new machine, foreseen to be completed in 2025-2026, will be equipped with 168 beam position readout systems divided into 12 cells. The BPM electronics will be based on the prototypes developed by the laboratory, relying on the pilot-tone compensation technique for assuring the required resolution and long-term stability. The industrialization and production of the BPM electronics system are being carried out in partnership with Instrumentation Technologies, a company that has experience with BPM readout systems within the accelerator field. This paper will present the results of the industrialization of one of BPM system’s key component: the Pilot Tone Front End, focusing on its improvements introduced on electronic and mechanical sides, giving not only a significant performance gain with respect to the previous prototype but also improving robustness and reliability. An overview of the testing procedures that will assure the performance repeatability of the series will also be provided.
	Poster MOP13 [1.295 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP13
About •	Received ※ 30 August 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 05 November 2022
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MOP14	Design and Implementation of an FPGA-Based Digital Processor for BPM Applications	55
	M. Colja, S. Carrato University of Trieste, Trieste, Italy G. Brajnik, R. De Monte Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Digital processing systems have been proven to often outperform analog elaboration. Indeed, thanks to high-density DSPs and FPGAs, operations in digital domain give results that are impossible to achieve in other ways. On the other side, dealing with this great performance and flexibility is not always straightforward: the processing chain needs to be accurately planned to reach the desired goals, avoiding erratic behaviours in the digital domain. In this paper, we focus on the design and implementation of an FPGA-based digital processor that will be used in the electron beam position monitors of Elettra 2.0. After digitizing the 500 MHz beam signals from the pickups, the system executes a digital down conversion, followed by several filtering and demodulating stages, in order to have a selectable data rate that is suitable for both diagnostics and feedback. The position calculation is also performed in FPGA as well, with the well-known difference-over-sum algorithm. According to results provided by a fixed-point simulation, the overall system has been implemented in an Intel Arria 10 FPGA, demonstrating the correct design functionality that meets the specified requirements.
	Poster MOP14 [1.475 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP14
About •	Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 09 October 2022
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MOP15	Development of Non-Invasive Calibration Software for Front End X-Ray Beam Position Monitors at Diamond Light Source, Oxfordshire, UK	59
	C.E. Houghton, C. Bloomer, L. Bobb DLS, Harwell, United Kingdom
	Tungsten blade based photoemission X-ray Beam Position Monitors (XBPMs) are widely used as white beam diagnostics at synchrotrons. Traditionally, the scale factors are determined by stepper motor movements of the XBPM, or by controlled electron beam displacements, and measuring the response. These measurements must be repeated for each ID gap to produce a complete set of scale factors for all operational conditions. This calibration procedure takes time and cannot be done while users are acquiring data. In addition, the scale factors can vary over time due to changes to the storage ring. It is possible for these scale factors to become inaccurate, reducing the accuracy of the beam position measured by the XBPMs. By using the intrinsic kHz electron beam movements and correlating the signals from electron beam position monitors and XBPMs it is possible to have a real-time calculation of the scale factors without the need to disturb user operation. Presented in this paper is a method to non-invasively calculate scale factors during normal user operation. A comparison of the precision of this method versus the traditional stepper motor method is presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP15
About •	Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 17 October 2022
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MOP16	Time Resolved Dynamics of Transverse Resonance Island Buckets at SPEAR3	62
	K. Tian, W.J. Corbett, J. Kim, J.A. Safranek SLAC, Menlo Park, California, USA
	The Transverse Resonance Island Buckets have been studied at SPEAR3 as an option for timing experiment mode operation of this third generation synchrotron radiation facility. In this mode, with proper optics setting, the electron beam is populated to island orbits with the excitation from a kicker. In this paper, we will report the experimental observation of the beam dynamics with turn by turn beam position monitors and a fast gated camera. The results are also compared with tracking simulations.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP16
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 22 September 2022
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MOP17	Development of a Scintillation Fibre Transverse Profile Monitor for Low-Intensity Ion Beams at HIT	67
	R.L. Hermann, M. Galonska, Th. Haberer, A. Peters HIT, Heidelberg, Germany T. Gehrke German Cancer Research Center (DKFZ), Heidelberg, Germany B. Leverington Universität Heidelberg, Heidelberg, Germany
	Funding: Funded by Deutsche Forschungsgemeinschaft (DFG), project number 426970603. The Heidelberg Ion-Beam Therapy Center (HIT) pro-vides proton, helium, and carbon-ion beams with differ-ent energies and intensities for cancer treatment and oxy-gen-ion beams for experimentation. Below the intensities used for therapy, low-intensity ion beams (below 1·10⁵ ions/s) are available for various experiments via manual-ly degrading of the beam. Since there is no built-in beam profile instrumentation device for this intensity region, the development of a transverse ion beam profile monitor for these intensities is therefore of interest. The principle of operation is based on scintillating fibres, particularly those with enhanced radiation hardness. The fibres transform the deposited energy of a traversing ion into photons, which are then converted and amplified via silicon pho-tomultipliers (SiPMs) into electric pulses. These pulses are recorded and processed by a novel and dedicated readout electronics: the front-end readout system (FERS) A5200 by CAEN. A prototype set-up consisting of all the above-mentioned parts was tested in beam and has proven to record the transverse beam profile successfully from intensities of 1·10⁷ ions/s down to 1·10² ions/s.
	Poster MOP17 [1.943 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP17
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 10 November 2022
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MOP18	X-Ray Pinhole Camera Spatial Resolution Using High Aspect Ratio LIGA Pinhole Apertures	71
	N. Vitoratou, L. Bobbpresenter DLS, Oxfordshire, United Kingdom A. Last KIT, Eggenstein-Leopoldshafen, Germany G. Rehm HZB, Berlin, Germany
	X-ray pinhole cameras are employed to provide the transverse profile of the electron beam from which the emittance, coupling and energy spread are calculated in the storage ring of Diamond Light Source. Tungsten blades separated by shims are commonly used to form the pinhole aperture. However, this approach introduces uncertainties regarding the aperture size. X-ray lithography, electroplating and moulding, known as LIGA, has been used to provide thin screens with well-defined and high aspect ratio pinhole apertures. Thus, the optimal aperture size given the beam spectrum can be used to improve the spatial resolution of the pinhole camera. Experimental results using a LIGA screen of different aperture sizes have been compared to SRW-Python simulations over the 15-35 keV photon energy range. Good agreement has been demonstrated between the experimental and the simulation data. Challenges and considerations for this method are also presented.
	Poster MOP18 [0.600 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP18
About •	Received ※ 08 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 21 November 2022
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MOP19	Commissioning of the Renewed Long Radial Probe in PSI Ring Cyclotron	76
	M. Sapinski, R. Dölling, M. Rohrer PSI, Villigen PSI, Switzerland
	PSI’s Ring cyclotron is a high intensity proton cyclotron producing 2 mA beam. The beam is accelerated over about 180 turns from 72 MeV to 590 MeV. The Long Radial Probe, called RRL, scans the beam along the range of beam radii from 2048 mm to 4480 mm. A replacement for the RRL has been developed in the last years. The recently installed new probe drives three carbon fibers with 30 ’m diameter through the turns and measures secondary electron currents, providing information on horizontal and vertical beam shape. Additional drives are available for a later extension of measurement capabilities. The main challenges are a coupling of the device elements to RF fields leaking from the accelerating cavities, plasma interfering with the measured signal and performance of the carbon fibers in harsh environment with high intensity beam. We report on commissioning of the probe with RF and beam and discuss measurement results. doi:10.18429/JACoW-IBIC2020-WEPP33
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP19
About •	Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 24 November 2022
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MOP21	First Results of PEPITES, A New Transparent Profiler Based on Secondary Electrons Emission for Charged Particle Beams	80
	C. Thiebaux, L. Bernardi, F. Gastaldi, Y. Geerebaert, R. Guillaumat, F. Magniette, P. Manigot, M. Verderi LLR, Palaiseau, France É. Delagnes, F.T. Gebreyohannes, O. Gevin CEA-IRFU, Gif-sur-Yvette, France F. Haddad, N. Servagent SUBATECH, Nantes, France F. Haddad, C. Koumeir, F. Poirier Cyclotron ARRONAX, Saint-Herblain, France
	Funding: This study is supported by two programs of the Agence Nationale de la Recherche, ANR-17-CE31-0015 and ANR-11-EQPX-0004. The PEPITES project* consists of a brand new operational prototype of an ultra-thin, radiation-resistant profiler capable of continuous operation on mid-energy (O(100 MeV)) charged particle accelerators. Secondary electron emission (SEE) is used for the signal because it only requires a small amount of material (10 nm); very linear, it also offers good dynamics. The lateral beam profile is sampled using segmented electrodes, constructed by thin film methods. Gold strips, as thin as the electrical conductivity allows (~ 50 nm), are deposited on an insulating substrate as thin as possible. While crossing the gold, the beam ejects the electrons by SEE, the current thus formed in each strip allows the sampling. SEE was characterized at ARRONAX with 68 MeV proton beams and at medical energies at CPO*. Electrodes were subjected to doses of up to 10⁹ Gy without showing significant degradation. A demonstrator with dedicated electronics (CEA) is installed at ARRONAX and will be used routinely with proton beams of 17-68 MeV for intensities of 100fA to 100nA. An overview of the design and first measurements will be presented, and system performances will be assessed. LLR, ARRONAX cyclotron and CEA **Orsay Protontherapy Center (Institut Curie)
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP21
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 30 September 2022
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MOP22	Development of New Beam Position Detectors for the NA61/SHINE Experiment	84
	M.U. Urbaniak, Y. Balkova, S.K. Kowalski, S. Puławski, K.W. Wójcik University of Silesia in Katowice, Katowice, Poland
	NA61/SHINE is a fixed-target experiment located at CERN Super Proton Synchrotron. The development of new beam position detectors is part of the ongoing upgrade of the detector system. Two types of detectors have been manufactured and tested. The first one is a scintillating fibers detector with photomultiplier as a readout. The scintillating fibers detector consists of two ribbons, which are arranged perpendicularly to each other. Each ribbon is made of two layers of 250 µm diameter fibers. The grouping method was used, which allows using of a single multichannel photomultiplier for one detector. The second type of detector is based on the single-sided silicon strip detector (SSD). In this project, Si strips produced by Hamamatsu (S13804) were used, where the pitch has a width equal to 190 um. The developed detectors must meet several requirements: should work efficiently with proton and lead beams with beam intensity on the level of 100 kHz, the detector’s material on the beamline should be minimized, the detectors should be able to determine the position of X and Y hit of each beam particle with maximum possible accuracy. During my speech I will present the results of our work.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP22
About •	Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 13 September 2022
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MOP23	Recent LHC SR Interferometer Simulations and Experimental Results	88
	D. Butti, E. Bravin, G. Trad CERN, Meyrin, Switzerland S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom
	At the CERN Large Hadron Collider (LHC), among the different systems exploiting Synchrotron Radiation (SR) for beam diagnostics, interferometry is under study as a non-invasive technique for measuring absolute beam transverse sizes. Extensive numerical simulations, recently completed for characterising the spatial coherence of the LHC SR source, facilitated the optimisation of the LHC interferometer design and the existing prototype system tested in the past has been refurbished to include the new simulation findings. This contribution describes the simulation specificity and then focuses on first measurements performed at the beginning of the LHC run 3. Such experiments allowed to obtain a first validation of the expected system performance at the injection energy of 450 GeV. A complete benchmark of the simulations will be carried out in 2022 as soon as the LHC will reach its top energy of 6.8 TeV.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP23
About •	Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 04 October 2022
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MOP24	Test of a Prototype for Modular Profile and Position Monitors in the Shielding of the 590 MeV Beam Line at HIPA	92
	R. Dölling, F. Marcellini, M. Sapinski PSI, Villigen PSI, Switzerland
	A new generation of monitor plugs is under develop-ment as spares for the ageing wire profile monitors and beam position monitors inserted into massive shielding in the target regions of the 590 MeV proton beam line at HIPA. A prototype was installed recently in the beam line to the ultra-cold neutron source UCN, to test the perfor-mance of wire monitor, BPM and modular mechanical design in a low-radiation environment. We report on first measurements with beam.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP24
About •	Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 27 November 2022
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MOP26	Bunch Length Measurement Systems at S-DALINAC*	96
	A. Brauch, M. Arnold, J. Enders, L.E. Jürgensen, N. Pietralla, S. Weih TU Darmstadt, Darmstadt, Germany
	Funding: *Work supported by DFG (GRK 2128) and the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006). A high-quality beam is necessary for electron scattering experiments at the superconducting Darmstadt electron linear accelerator S-DALINAC. An optimization of the bunch length to typical values of < 2 ps is performed to reach a high energy resolution of 1e-4. Currently, this is accomplished by inducing a linear momentum spread on the bunch in one of the accelerating cavities. The bunch length can then be measured with a target downstream. This method is time consuming and provides only an upper limit of the bunch length. Two new setups for bunch length measurements will improve the optimization process significantly. On the one hand, a new diagnostic beam line is set up in the low energy beam area. It includes a deflecting copper cavity used for measuring the bunch length by shearing the bunch and projecting its length on a target. On the other hand, a streak camera placed at different positions downstream the injector and the main linac will be used to measure the bunch length. Optical transition radiation from an aluminium coated kapton target is used to perform this measurement. The present layout of both systems and their current status will be presented in this contribution.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP26
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 12 November 2022
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MOP27	Design Considerations of the Corrugated Structures in a Vacuum Chamber for Impedance Studies at KARA	100
	S. Maier, M. Brosi, H.J. Cha, A. Mochihashi, A.-S. Müller, M.J. Nasse, P. Schreiber, M. Schwarz KIT, Karlsruhe, Germany
	Funding: Supported by the DFG project 431704792 in the ANR-DFG collaboration project ULTRASYNC and by the Doctoral School KSETA. Two parallel, corrugated plates will be installed at the KIT storage ring KARA (KArlsruhe Research Accelerator). This impedance manipulation structure can be used to study and eventually control the electron beam dynamics and the emitted coherent synchrotron radiation (CSR) at KARA. In this contribution, we present the design of the impedance manipulation structure with corrugated plates, simulation results showing the influence of different corrugation parameters on its impedance, and the impact of this additional impedance source on the temporal changes in the emitted CSR in the presence of the microbunching instability.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP27
About •	Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 07 December 2022
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MOP28	Improvements in Longitudinal Phase Space Tomography at PITZ	105
	N. Aftab, Z. Aboulbanine, P. Boonpornprasert, G.Z. Georgiev, J. Good, M. Groß, A. Hoffmann, M. Krasilnikov, X.-K. Li, A. Lueangaramwong, R. Niemczyk, A. Oppelt, H.J. Qian, C.J. Richard, F. Stephan, G. Vashchenko DESY Zeuthen, Zeuthen, Germany W. Hillert University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany A.J. Reader KCL, London, United Kingdom
	Methodical studies to improve the longitudinal phase space (LPS) tomography of space-charge dominated electron beams were carried out at the Photo Injector Test facility at DESY in Zeuthen (PITZ). An analytical model was developed to quantify mean momentum, RMS energy spread, bunch length and phase advance. Phase advance analysis determined the booster phase scan range and step size to be used for obtaining momentum projections. A slit was introduced before the booster to truncate the beam in transverse plane to strongly reduce the space charge effects. The signal resolution of this truncated beam was improved by careful beta function control at the reference screen of the momentum measurements. The reconstruction algorithm was changed from Algebraic Reconstruction Technique (ART) to Image Space Reconstruction Algorithm (ISRA) owing to its assurance of non-negative solutions. In addition, the initial physically justified assumption of LPS, based on low-energy section measurements, was established to clear out noise-like artefacts. This paper will highlight the improvements made in the LPS tomography and compare the simulated and experimental results.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP28
About •	Received ※ 06 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 15 October 2022
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MOP29	Low Gain Avalanche Detector Application for Beam Monitoring	109
	V. Kedych, T. Galatyuk, W. Krüger TU Darmstadt, Darmstadt, Germany T. Galatyuk, S. Linev, J. Pietraszko, C.J. Schmidt, M. Träger, M. Traxler, F. Ulrich-Pur GSI, Darmstadt, Germany J. Michel Goethe Universität Frankfurt, Frankfurt am Main, Germany A. Rost FAIR, Darmstadt, Germany V. Svintozelskyi Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
	Funding: This work has been supported by DFG under GRK 2128 The S-DALINAC is a superconductive linear electron accelerator operating at 3 GHz and allows operation in energy recovery mode (ERL). For the operation in the ERL mode accelerated and decelerated beams travel inside the same beamline but not necessarily share the same orbit. That leads to a bunch rate of 6 GHz. Non-destructive monitoring tools that allow optimization of acceleration and deceleration processes and achieve high recovery efficiency are important for operation in the ERL mode. The Low Gain Avalanche Detector (LGAD) is a silicon detector with internal gain layer optimized for 4-D tracking with timing resolution below 50 ps* which makes it a promising candidate for beam time structure monitoring. In this contribution we present the status of the first proof of principle beam time structure measurement with LGAD sensors at S-DALINAC in normal operation mode together with future activities overview. * J.Pietraszko, et al., Low Gain Avalanche Detectors for the HADES reaction time (T0) detector upgrade, Eur. Phys. J. A 56, 183 (2020)
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP29
About •	Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 16 October 2022
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MOP31	Automatic Adjustment and Measurement of the Electron Beam Current at the Metrology Light Source (MLS)	113
	Y. Petenev, J. Feikes, J. Li HZB, Berlin, Germany A.B. Barboutis, R. Kleinpresenter, M. Müller PTB, Berlin, Germany
	The electron storage ring MLS (Metrology Light Source) is used by the Physikalisch-Technische Bundesanstalt (PTB), the German metrology institute, as a primary source standard of calculable synchrotron radiation in the ultraviolet and vacuum ultraviolet spectral range. For this, all storage ring parameters have to be appropriately set and measured with high uncertainty. E.g., the electron beam current can be varied by more than 11 orders. This adjustment of the electron beam current, and thus the spectral radiant intensity of the synchrotron radiation, for the specific calibration task is conveniently performed fully automatic by a computer program.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP31
About •	Received ※ 01 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 15 October 2022
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MOP32	Analog Front End for Measuring 1 to 250 pC Bunch Charge at CLARA	117
	S.L. Mathisen, T.H. Pacey, R.J. Smith STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	As part of the development of the CLARA electron accelerator at Daresbury Laboratory, a new analog front end for bunch charge measurement has been developed to provide accurate measurements across a wide range of operating charges with repetition rates of up to 400 Hz. The qualification tests of the front end are presented. These include tests of the online calibration system, compared to a bench Faraday cup test setup; online beam test data with a Faraday cup from 1 to 200 pC; online beam test data with a wall current monitor from 1 to 200 pC, and tests using signal processing such as singular value decomposition. This is demonstrated to enable the measurement of bunch charges in the order of 100 fC using both Faraday Cups and Wall Current Monitors.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP32
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 09 October 2022
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MOP33	Beam Current Measurements at the Nano-Ampere Level Using a Current Transformer	121
	M. Xiao UMCG, Groningen, The Netherlands S. Brandenburg, M.J. Goethem PARTREC, Groningen, The Netherlands T. Delaviere, L. Dupuy, F. Stullepresenter BERGOZ Instrumentation, Saint Genis Pouilly, France
	In conventional proton therapy (PT) typical beam currents are of the order of 1 nA. At these currents dose monitoring is reliably achieved with an ionization chamber. However, at the very high dose rates used in FLASH irradiations (employing beam currents >100 nA) ionization chambers will exhibit large intensity dependent recombination effects and cannot be used. A possible solution is a current transformer. Here we report on the performance of the LC-CWCT (Bergoz Instrumentation, France) which has been developed to push noise floor of such non-destructive current measurement systems into the nano-ampere range. We present first beam current measurements at the PARTREC cyclotron (Netherlands). Beam currents measured by the LC-CWCT and a Faraday Cup were shown to linearly correlate up to the maximum intensity of 400 nA used in the measurements. For pulsed beams, charge measured by the LC-CWCT linearly correlated with pulse length over the measurement range from 50 to 1000 µs. Measurement noise as low as 2.8 nA was achieved. The results confirm that the LC-CWCT has the potential to be applied in FLASH PT for accurate determination of beam current and macro pulse charge.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP33
About •	Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 14 September 2022
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MOP34	New X-Rays Diagnostics at ESRF: The X-BPMs and the Halo-Monitor	125
	E. Buratin, K.B. Scheidt ESRF, Grenoble, France
	Two new X-ray diagnostics have been installed in the Front-Ends of the Storage Ring of the ESRF’s Extremely Brilliant Source (EBS) recently. Two independent optical X-BPMs at 23m distance from their bending magnet source-point are giving extremely useful additional information on the vertical beam stability in comparison to the e-BPMs data. A vertical beam Halo-monitor allows to measure permanently and quantitatively the level the electron density at large distance (1-3mm) from the beam core, in a non-destructive manner.
	Poster MOP34 [1.198 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP34
About •	Received ※ 30 August 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 27 November 2022
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MOP35	New Measurements Using Libera-Spark Electronics at ESRF: The High Quality Phase-Monitor and the Single-Electron	129
	E. Buratin, N. Benoist, P.B. Borowiec, G. Denat, J. Jacob, K.B. Scheidt, F. Taoutaou ESRF, Grenoble, France
	Several new diagnostics have been installed and exploited at the ESRF’s new Extremely Brilliant Source (EBS) in 2022. A Libera-Spark BPM device has been implemented to measure the phase of Booster and EBS rings, with high resolution and up to turn-by-turn rate. In the Storage Ring we achieved irrefutably the control, injection and measurement of single electron(s) with the use of transfer-line screens, the visible-light extraction system and a low-cost photo-multiplier tube, combined with the commercial Spark Beam Loss Monitor. Further planned developments, like the TCPC technique, on this are on-going and will be essential to verify that our Booster cleaning process reaches a level of zero-electron bunch pollution in EBS.
	Poster MOP35 [2.094 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP35
About •	Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 17 November 2022
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MOP36	Novel Beam Excitation System Based on Software-Defined Radio	133
	P.J. Niedermayer, R. Singh GSI, Darmstadt, Germany
	Funding: This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under GA No 101004730. A signal generator for transverse excitation of stored particle beams is developed and commissioned at GSI SIS18. Thereby a novel approach using a software-defined radio system and the open-source GNU Radio ecosystem is taken. This allows for a low cost yet highly flexible setup for creating customizable and tuneable excitation spectra. Due to its open-source nature, it has the potential for long term maintainability and integrability into the accelerator environment. Furthermore, this opens up the possibility to easily share algorithms for the generation of waveforms across accelerator facilities. As a first application, the device is used to control the coherence and amplitude of transverse oscillations by excitation in the vicinity of betatron sidebands. It enables measurement of beam parameters like tune and chromaticity. On a longer term, it will be used for more complex tasks such as beam shaping, extraction and automated parameter scans towards these complex processes.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP36
About •	Received ※ 31 August 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 10 November 2022
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MOP37	Beam Polarization Measurements with the Revised Compton Polarimeter at ELSA	137
	M.T. Switka, K. Desch, D. Elsner ELSA, Bonn, Germany W. Hillert University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
	The Compton Polarimeter at the ELSA 3.2 GeV storage ring has been designed to measure the polarization degree of the stored electron beam by analyzing the profile of the back-scattered gamma-beam with a silicon microstrip detector. Utilizing a scattering asymmetry from interaction with circularly polarized laser light, the electron beam polarization is determined from the vertical shift of the gamma-beam’s center of gravity in respect to the handedness of the laser light. The installation of a new laser source and silicon strip detector has improved the polarimeter’s performance significantly. Additionally, the profile analysis could be enhanced by using a Pearson type peak function fit. The analyzing power was determined through the observation of the Sokolov-Ternov effect and a statistical measurement accuracy of 2 % could be obtained within 5 minutes of measurement time. The polarimeter resolves the expected spin dynamical effects occurring in the storage ring and has shown to be a robust and reliable measurement system for operation with the GaAs source for polarized electrons.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP37
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 19 September 2022
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MOP38	Beam Profile Monitoring and Distributed Analysis Using the RabbitMQ Message Broker	140
	D. Proft, K. Desch, D. Elsner, F. Frommberger, S. Kronenberg, A. Spreitzer, M.T. Switkapresenter ELSA, Bonn, Germany
	The ELSA facility utilizes several digital cameras for beam profile measurements on luminous screens and synchrotron radiation monitors. Currently a multitude of devices with analog signal output are being replaced in favor of digital outputs, preferably with data transfer via Ethernet. The increased network traffic for streaming, analyzing, and distribution of processed data to control system and machine operators is managed through a supplementary camera network in which distributed computing is performed by the RabbitMQ message broker. This allows performant and platform-independent image acquisition from multiple cameras, real time profile analysis, and supports programming interfaces for C++ and Python. The setup and performance of the implementation are presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP38
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 28 October 2022
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MOP39	Development of Compact Radio Frequency Sources	144
	M.S. McCallum, A. Lyapin JAI, Egham, Surrey, United Kingdom
	Funding: This work is supported by STFC’s Impact Acceleration Account scheme. Our group is developing a family of compact radio frequency sources aiming to cover 50 MHz to 20 GHz with several models. The primary goal is to provide an alternative to using expensive laboratory generators in permanent installations. In addition, we work towards providing a higher specification than similar telecommunications devices as this is a typical requirement in accelerator instrumentation. We take a minimalistic approach with only a network interface planned, assuming that such a device operates remotely in a large facility. An EPICS interface is in the works for monitoring and control. In this paper, we present the results of rapid prototyping with XMicrowave components. The first measurements show encouraging phase noise performance and spectral purity.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP39
About •	Received ※ 08 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 02 November 2022
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MOP40	Synchronous Data Service at the European Spallation Source	148
	R. Titmarsh STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J.F. Esteban Müller, J.P.S. Martins ESS, Lund, Sweden
	The Synchronous Data Service (SDS) is a tool to monitor and capture events in the European Spallation Source, building on top of the EPICS control system. Large amounts of data from different input output controllers are acquired and synchronised at the level of beam pulses. The acquisition can be triggered by beam events though the timing system or manually by a user. Captured data is stored in standardised NeXus files and indexed in a database for easy searching and retrieval.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP40
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 12 October 2022
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MOP42	KINGFISHER: A Framework for Fast Machine Learning Inference for Autonomous Accelerator Systems	151
	L. Scomparin, E. Blomley, E. Bründermann, M. Caselle, T. Dritschler, A. Kopmann, A. Mochihashi, A.-S. Müller, A. Santamaria Garcia, P. Schreiber, J.L. Steinmann, M. Weber KIT, Eggenstein-Leopoldshafen, Germany T. Boltz SLAC, Menlo Park, California, USA
	Modern particle accelerator facilities allow new and exciting beam properties and operation modes. Traditional real-time control systems, albeit powerful, have bandwidth and latency constraints that limit the range of operating conditions currently made available to users. The capability of Reinforcement Learning to perform self-learning control policies by interacting with the accelerator is intriguing. The extreme dynamic conditions require fast real-time feedback throughout the whole control loop from the diagnostic, with novel and intelligent detector systems, all the way to the interaction with the accelerator components. In this contribution, the novel KINGFISHER framework based on the modern Xilinx Versal devices will be presented. Versal combines several computational engines, specifically combining powerful FPGA logic with programmable AI Engines in a single device. Furthermore, this system can be natively integrated with the fastest beam diagnostic tools already available, i.e. KAPTURE and KALYPSO.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP42
About •	Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 09 October 2022
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MOP43	Web-Based Application for Cable Simulation Models	156
	M.C. Paniccia, S.L. Clark, D.M. Gassner, R.L. Hulsart, P. Thieberger BNL, Upton, New York, USA
	Attenuation in a lossy coaxial cable increases over distance and varies over frequency. Having a model of these variations can help predict the expected loss and distortion of a signal. This paper discusses a free web-based application developed to provide accurate SPICE models for various coaxial cable types. The user can specify a length and select between different cable types, or upload their own cable attenuation curve, and receive a SPICE model for that cable. These simulation models have been used to assist the design and development of new instrumentation systems for the future Electron Ion Collider (EIC).
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP43
About •	Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 22 November 2022
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MOP44	Novel Photoemission Type X-Ray Beam Position Monitor for the "White" Undulator Radiation	159
	P. Ilinski MAX IV Laboratory, Lund University, Lund, Sweden
	Funding: Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research council, the Swedish Governmental Agency for Innovation Systems, and Formas. A novel photoemission type of X-ray Beam Position Monitor (XBPM) for the ’white’ undulator radiation is proposed. The XBPM employs beamline frontend fixed mask as a source of photocurrent signal. Signal spatial distribution and XBPM response were analyzed for various undulator radiation parameters.
	Poster MOP44 [0.962 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP44
About •	Received ※ 02 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 19 September 2022
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MOP45	A New Luminosity Monitor for the LHC Run 3	163
	S. Mazzoni, W. Andreazza, E. Balci, D. Belohrad, E. Bravin, N.S. Chritin, J.C. Esteban Felipe, T. Lefèvre, M. Martin Nieto, M. Palm CERN, Meyrin, Switzerland
	The Beam Rate of Neutrals (BRAN) is a monitor that provides a relative luminosity measurement for the four LHC experiments. BRANs are used during operations as a tool to find and optimise collision and to cross-check experiments luminosity monitors. While each LHC experiments is equipped with BRANs, in this contribution we will focus on the new monitors installed for ATLAS and CMS that will replace the current ageing gas chambers during LHC run 3. These will also serve as as prototypes for the future High Luminosity LHC monitors that will need to sustain an even higher collision rate. A description of the BRAN as well as the first results obtained during the LHC Run 3 start-up will be presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP45
About •	Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 14 September 2022 — Issue date ※ 23 November 2022
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Paper

Title

Page

SLS 2.0 – Status of the Diagnostics

15

C. Ozkan Loch, R. Ischebeck, N. Samadipresenter, A.M.M. Stampfli, J. Vila Comamala
PSI, Villigen PSI, Switzerland

This poster will give an overview of the diagnostics development for SLS 2.0. Details on the beam size monitors in the storage ring, the screen monitors for the booster to ring transfer line, and beam loss monitors for the linac and storage ring will be presented. Test results carried out at the SLS will also be presented.
BPMs and feedback systems are not covered in this contribution.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP01

About •

Received ※ 06 September 2022 — Revised ※ 13 September 2022 — Accepted ※ 18 September 2022 — Issue date ※ 01 December 2022

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MOP02

An Optical Diagnostic Beamline for the Bessy II Booster

19

T. Atkinson, J.-G. Hwang, G. Rehm, M. Ries, G. Schiwietz, S. Wiese
HZB, Berlin, Germany

As part of the global refurbishment of the injector at BESSY II, a new optical beamline has been installed in the booster. This paper covers the conceptual design: incorporating the beamline into an operational facility without downtime, the simulation and expectations of the optical transport line, mechanical installation and commissioning with beam. These first results with the present beam delivery system have already achieved source point imaging and bunch length measurements using a fast diode. With the additional PETRA cavity installed for this booster upgrade and connection to acquire RF power in the 2022 summer shutdown planned, the bunch length diagnostics are critical. The beamline will also undergo a final mechanical upgrade and then see the installation of a streak camera.

Poster MOP02 [0.975 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP02

About •

Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 December 2022 — Issue date ※ 12 December 2022

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MOP03

Status Overview of the HESR Beam Instrumentation

23

C. Böhme
FZJ, Jülich, Germany
A.J. Halama, V. Kamerdzhiev, G.R. Rupsch
GSI, Darmstadt, Germany

The High Energy Storage Ring (HESR), within the FAIR project, will according to current planning provide anti-proton beams for PANDA and heavy ion beams for a.o. SPARC. With the beam instrumentation devices envisaged in larger quantities, e.g. BPM and BLM, testing is well underway. Other beam instrumentation instruments like Viewer are in late production stage, Scraper is being tested and for the IPM the 1st of series production has started. An overview of the status of the work package beam instrumentation will be presented as well as test bench results of already produced instruments.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP03

About •

Received ※ 08 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 28 September 2022

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MOP05

Fiber Bragg Grating Sensors as Beam-Induced Heating Monitor for the Central Beam Pipe of CMS

28

F. Fienga, G. Breglio, A. Irace, V.R. Marrazzo, L. Sitopresenter
University of Napoli Federico II, Napoli, Italy
N. Beni, G. Breglio, S. Buontempo, F. Carra, F. Fienga, F. Giordano, V.R. Marrazzo, B. Salvant, L. Sitopresenter, Z. Szillasi
CERN, Meyrin, Switzerland
N. Beni, Z. Szillasi
Atomki, Debrecen, Hungary
S. Buontempo
INFN-Napoli, Napoli, Italy

The passage of a high-intensity particle beam inside accelerator components generates heating, potentially leading to degradation of the accelerator performance or damage to the component itself. It is therefore essential to monitor such beam-induced heating in accelerators. This paper showcases the capabilities of iPipe, which is a set of Fiber Bragg Grating sensors stuck on the inner beam pipe of the Compact Muon Solenoid (CMS) experiment installed in the CERN Large Hadron Collider (LHC). In this study, the wavelength shift, linked directly to the temperature shift, is measured and is compared with the computed dissipated power for a set of LHC fills. Electromagnetic and thermal simulations were also coupled to predict the beam-induced temperature increase along the beam pipe. These results further validate the sensing system and the methods used to design accelerator components to mitigate beam-induced heating.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP05

About •

Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 September 2022

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MOP07

Beam Instrumentation Performance During Commissioning of the ESS RFQ, MEBT and DTL

32

T.J. Shea, R.A. Baron, C.S. Derrez, E.M. Donegani, V. Grishin, H. Hassanzadegan, I. Kittelmann, H. Kocevar, N. Milas, D. Noll, H.A. Silva, R. Tarkeshian, C.A. Thomas
ESS, Lund, Sweden
I. Bustinduy
ESS Bilbao, Zamudio, Spain
M. Ferianis
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
T. Papaevangelou, L. Seguí
CEA-IRFU, Gif-sur-Yvette, France

In late 2021 through mid 2022, the first protons were accelerated and transported through the European Spallation Source (ESS) Radio Frequency Quadrupole and Medium Energy Transport line at 3.6 MeV, and finally through the first Drift Tube Linac tank at 21 MeV. To enable these achievements, the following beam instrumentation systems were deployed: Ion Source power supply monitors, beam chopping systems, Faraday Cups, Beam Current Monitors (BCM) and Beam Position Monitors (BPM) that also measured phase. Additional systems were deployed for dedicated studies, including Wire Scanners, a slit and grid Emittance Measurement Unit, neutron Beam Loss Monitors and fast BCM and BPM systems. The instrumentation deployment is the culmination of efforts by a partnership of the ESS beam diagnostics section, multiple ESS groups and institutes across the globe. This paper summarizes the beam tests that characterized the performance of the instrumentation systems and verified the achievement of commissioning goals.

Poster MOP07 [5.388 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP07

About •

Received ※ 30 August 2022 — Accepted ※ 15 September 2022 — Issue date ※ 07 November 2022

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MOP08

Development of a Waveguide BPM System

37

A. Lyapin, W. Shields
JAI, Egham, Surrey, United Kingdom

Funding: This work was supported by STFC Follow on Fund grant number ST/T003413/1
A mode-selective waveguide beam position monitor is under development. It is aimed primarily at electron linacs, although with its low impedance and wide bandwidth it could find alternative applications. In this paper we go over the design of the waveguide BPM system including the sensor and analog electronics, consider requirements to the digital processing and present some simulated results.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP08

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Received ※ 09 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 29 November 2022

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MOP09

Towards Higher Stability in Large Scale Cavity BPM Systems

40

A. Lyapin, M.S. McCallum
JAI, Egham, Surrey, United Kingdom
A. Aryshev, K.O. Kruchinin
KEK, Ibaraki, Japan

Funding: This work is supported by Royal Society International Exchanges Grant number IEC\R3\213050
In this contribution we consider a possible solution to long-term stability issues common in cavity BPM systems. The method will see a wider use active in-situ calibration systems injecting a tone into the measurement channel. We plan to compensate the bulk of the beam generated signal and so potentially extend the dynamic range of the electronics, reduce the amount of wakefield seen by the beam. The signal matching the real beam can then be used for mimicking the beam and calibrating out any drifts of the whole sensing and processing chain. We present the concept, give some simulated results and consider possible hardware solutions.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP09

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Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 12 November 2022

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MOP10

Removing Noise in BPM Measurements with Variational Autoencoders

43

J.P. Edelen, J.A. Einstein-Curtis, C.C. Hall, M.J. Henderson
RadiaSoft LLC, Boulder, Colorado, USA
A.L. Romanov
Fermilab, Batavia, Illinois, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0021699.
Noise in beam measurements is an ever-present challenge in accelerator operations. In addition to the challenges presented by hardware and signal processing, new operational regimes, such as ultra-short bunches, create additional difficulties in routine beam measurements. Techniques in machine learning have been successfully applied in other domains to overcome challenges inherent in noisy data. Variational autoencoders (VAEs) are shown to be capable of removing significant leevels of noise. A VAE can be used as a pre-processing tool for noise removal before the de-noised data is analyzed via other methods, or the VAE can be directly used to make beam dynamics measurements. Here we present the use of VAEs as a tool for addressing noise in BPM measurements.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP10

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Received ※ 29 August 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 24 November 2022

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MOP12

Production of Cavity Beam Position Monitors for the ARES Accelerator at DESY

47

D. Lipka, M. Holz, S. Vilcins
DESY, Hamburg, Germany

The SINBAD facility (Short and INnovative Bunches and Accelerators at DESY) hosts various experiments in the field of production of ultra-short electron bunches and novel high gradient acceleration techniques. The SINBAD facility, also called ARES (Accelerator Research Experiment at SINBAD), is a conventional S-band linear RF accelerator allowing the production of low charge ultra-short electron bunches within a range between 0.5 pC and 1000 pC. The positions of the low charge bunches will be detected by cavity beam position monitors. The principal design is based on the experience from the EU-XFEL cavity beam position monitors. It consists of a 316 LN stainless steel body with a design loaded quality factor of 70, a resonance frequency of 3.3 GHz and a relative wide gap of 15 mm to reach a high peak position sensitivity of 4.25 V/(nC mm). This poster covered, the manufacture of the individual mechanical parts, as well as presents the special features in the manufacture of customer designed UHV feedthroughs.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP12

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Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 06 November 2022

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MOP13

Test and Measurements Results of the Pilot Tone Front End Industrialization for Elettra 2.0

51

G. Brajnik, R. De Monte
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
M. Cargnelutti, U. Dragonja, P. Leban, P. Paglovec, B. Repič, A. Vigali
I-Tech, Solkan, Slovenia

Elettra 2.0 will be the low-emittance upgrade of the present machine, a third-generation lightsource based in Trieste, Italy. The new machine, foreseen to be completed in 2025-2026, will be equipped with 168 beam position readout systems divided into 12 cells. The BPM electronics will be based on the prototypes developed by the laboratory, relying on the pilot-tone compensation technique for assuring the required resolution and long-term stability. The industrialization and production of the BPM electronics system are being carried out in partnership with Instrumentation Technologies, a company that has experience with BPM readout systems within the accelerator field. This paper will present the results of the industrialization of one of BPM system’s key component: the Pilot Tone Front End, focusing on its improvements introduced on electronic and mechanical sides, giving not only a significant performance gain with respect to the previous prototype but also improving robustness and reliability. An overview of the testing procedures that will assure the performance repeatability of the series will also be provided.

Poster MOP13 [1.295 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP13

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Received ※ 30 August 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 05 November 2022

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MOP14

Design and Implementation of an FPGA-Based Digital Processor for BPM Applications

55

M. Colja, S. Carrato
University of Trieste, Trieste, Italy
G. Brajnik, R. De Monte
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Digital processing systems have been proven to often outperform analog elaboration. Indeed, thanks to high-density DSPs and FPGAs, operations in digital domain give results that are impossible to achieve in other ways. On the other side, dealing with this great performance and flexibility is not always straightforward: the processing chain needs to be accurately planned to reach the desired goals, avoiding erratic behaviours in the digital domain. In this paper, we focus on the design and implementation of an FPGA-based digital processor that will be used in the electron beam position monitors of Elettra 2.0. After digitizing the 500 MHz beam signals from the pickups, the system executes a digital down conversion, followed by several filtering and demodulating stages, in order to have a selectable data rate that is suitable for both diagnostics and feedback. The position calculation is also performed in FPGA as well, with the well-known difference-over-sum algorithm. According to results provided by a fixed-point simulation, the overall system has been implemented in an Intel Arria 10 FPGA, demonstrating the correct design functionality that meets the specified requirements.

Poster MOP14 [1.475 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP14

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

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MOP15

Development of Non-Invasive Calibration Software for Front End X-Ray Beam Position Monitors at Diamond Light Source, Oxfordshire, UK

59

C.E. Houghton, C. Bloomer, L. Bobb
DLS, Harwell, United Kingdom

Tungsten blade based photoemission X-ray Beam Position Monitors (XBPMs) are widely used as white beam diagnostics at synchrotrons. Traditionally, the scale factors are determined by stepper motor movements of the XBPM, or by controlled electron beam displacements, and measuring the response. These measurements must be repeated for each ID gap to produce a complete set of scale factors for all operational conditions. This calibration procedure takes time and cannot be done while users are acquiring data. In addition, the scale factors can vary over time due to changes to the storage ring. It is possible for these scale factors to become inaccurate, reducing the accuracy of the beam position measured by the XBPMs. By using the intrinsic kHz electron beam movements and correlating the signals from electron beam position monitors and XBPMs it is possible to have a real-time calculation of the scale factors without the need to disturb user operation. Presented in this paper is a method to non-invasively calculate scale factors during normal user operation. A comparison of the precision of this method versus the traditional stepper motor method is presented.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP15

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Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 17 October 2022

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MOP16

Time Resolved Dynamics of Transverse Resonance Island Buckets at SPEAR3

62

K. Tian, W.J. Corbett, J. Kim, J.A. Safranek
SLAC, Menlo Park, California, USA

The Transverse Resonance Island Buckets have been studied at SPEAR3 as an option for timing experiment mode operation of this third generation synchrotron radiation facility. In this mode, with proper optics setting, the electron beam is populated to island orbits with the excitation from a kicker. In this paper, we will report the experimental observation of the beam dynamics with turn by turn beam position monitors and a fast gated camera. The results are also compared with tracking simulations.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP16

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Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 22 September 2022

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MOP17

Development of a Scintillation Fibre Transverse Profile Monitor for Low-Intensity Ion Beams at HIT

67

R.L. Hermann, M. Galonska, Th. Haberer, A. Peters
HIT, Heidelberg, Germany
T. Gehrke
German Cancer Research Center (DKFZ), Heidelberg, Germany
B. Leverington
Universität Heidelberg, Heidelberg, Germany

Funding: Funded by Deutsche Forschungsgemeinschaft (DFG), project number 426970603.
The Heidelberg Ion-Beam Therapy Center (HIT) pro-vides proton, helium, and carbon-ion beams with differ-ent energies and intensities for cancer treatment and oxy-gen-ion beams for experimentation. Below the intensities used for therapy, low-intensity ion beams (below 1·10⁵ ions/s) are available for various experiments via manual-ly degrading of the beam. Since there is no built-in beam profile instrumentation device for this intensity region, the development of a transverse ion beam profile monitor for these intensities is therefore of interest. The principle of operation is based on scintillating fibres, particularly those with enhanced radiation hardness. The fibres transform the deposited energy of a traversing ion into photons, which are then converted and amplified via silicon pho-tomultipliers (SiPMs) into electric pulses. These pulses are recorded and processed by a novel and dedicated readout electronics: the front-end readout system (FERS) A5200 by CAEN. A prototype set-up consisting of all the above-mentioned parts was tested in beam and has proven to record the transverse beam profile successfully from intensities of 1·10⁷ ions/s down to 1·10² ions/s.

Poster MOP17 [1.943 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP17

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Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 10 November 2022

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MOP18

X-Ray Pinhole Camera Spatial Resolution Using High Aspect Ratio LIGA Pinhole Apertures

71

N. Vitoratou, L. Bobbpresenter
DLS, Oxfordshire, United Kingdom
A. Last
KIT, Eggenstein-Leopoldshafen, Germany
G. Rehm
HZB, Berlin, Germany

X-ray pinhole cameras are employed to provide the transverse profile of the electron beam from which the emittance, coupling and energy spread are calculated in the storage ring of Diamond Light Source. Tungsten blades separated by shims are commonly used to form the pinhole aperture. However, this approach introduces uncertainties regarding the aperture size. X-ray lithography, electroplating and moulding, known as LIGA, has been used to provide thin screens with well-defined and high aspect ratio pinhole apertures. Thus, the optimal aperture size given the beam spectrum can be used to improve the spatial resolution of the pinhole camera. Experimental results using a LIGA screen of different aperture sizes have been compared to SRW-Python simulations over the 15-35 keV photon energy range. Good agreement has been demonstrated between the experimental and the simulation data. Challenges and considerations for this method are also presented.

Poster MOP18 [0.600 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP18

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Received ※ 08 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 21 November 2022

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MOP19

Commissioning of the Renewed Long Radial Probe in PSI Ring Cyclotron

76

M. Sapinski, R. Dölling, M. Rohrer
PSI, Villigen PSI, Switzerland

PSI’s Ring cyclotron is a high intensity proton cyclotron producing 2 mA beam. The beam is accelerated over about 180 turns from 72 MeV to 590 MeV. The Long Radial Probe, called RRL, scans the beam along the range of beam radii from 2048 mm to 4480 mm. A replacement for the RRL has been developed in the last years*. The recently installed new probe drives three carbon fibers with 30 ’m diameter through the turns and measures secondary electron currents, providing information on horizontal and vertical beam shape. Additional drives are available for a later extension of measurement capabilities. The main challenges are a coupling of the device elements to RF fields leaking from the accelerating cavities, plasma interfering with the measured signal and performance of the carbon fibers in harsh environment with high intensity beam. We report on commissioning of the probe with RF and beam and discuss measurement results.
* doi:10.18429/JACoW-IBIC2020-WEPP33

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP19

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Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 24 November 2022

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MOP21

First Results of PEPITES, A New Transparent Profiler Based on Secondary Electrons Emission for Charged Particle Beams

80

C. Thiebaux, L. Bernardi, F. Gastaldi, Y. Geerebaert, R. Guillaumat, F. Magniette, P. Manigot, M. Verderi
LLR, Palaiseau, France
É. Delagnes, F.T. Gebreyohannes, O. Gevin
CEA-IRFU, Gif-sur-Yvette, France
F. Haddad, N. Servagent
SUBATECH, Nantes, France
F. Haddad, C. Koumeir, F. Poirier
Cyclotron ARRONAX, Saint-Herblain, France

Funding: This study is supported by two programs of the Agence Nationale de la Recherche, ANR-17-CE31-0015 and ANR-11-EQPX-0004.
The PEPITES project* consists of a brand new operational prototype of an ultra-thin, radiation-resistant profiler capable of continuous operation on mid-energy (O(100 MeV)) charged particle accelerators. Secondary electron emission (SEE) is used for the signal because it only requires a small amount of material (10 nm); very linear, it also offers good dynamics. The lateral beam profile is sampled using segmented electrodes, constructed by thin film methods. Gold strips, as thin as the electrical conductivity allows (~ 50 nm), are deposited on an insulating substrate as thin as possible. While crossing the gold, the beam ejects the electrons by SEE, the current thus formed in each strip allows the sampling. SEE was characterized at ARRONAX with 68 MeV proton beams and at medical energies at CPO**. Electrodes were subjected to doses of up to 10⁹ Gy without showing significant degradation. A demonstrator with dedicated electronics (CEA) is installed at ARRONAX and will be used routinely with proton beams of 17-68 MeV for intensities of 100fA to 100nA. An overview of the design and first measurements will be presented, and system performances will be assessed.
*LLR, ARRONAX cyclotron and CEA
**Orsay Protontherapy Center (Institut Curie)

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP21

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Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 30 September 2022

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MOP22

Development of New Beam Position Detectors for the NA61/SHINE Experiment

84

M.U. Urbaniak, Y. Balkova, S.K. Kowalski, S. Puławski, K.W. Wójcik
University of Silesia in Katowice, Katowice, Poland

NA61/SHINE is a fixed-target experiment located at CERN Super Proton Synchrotron. The development of new beam position detectors is part of the ongoing upgrade of the detector system. Two types of detectors have been manufactured and tested. The first one is a scintillating fibers detector with photomultiplier as a readout. The scintillating fibers detector consists of two ribbons, which are arranged perpendicularly to each other. Each ribbon is made of two layers of 250 µm diameter fibers. The grouping method was used, which allows using of a single multichannel photomultiplier for one detector. The second type of detector is based on the single-sided silicon strip detector (SSD). In this project, Si strips produced by Hamamatsu (S13804) were used, where the pitch has a width equal to 190 um. The developed detectors must meet several requirements: should work efficiently with proton and lead beams with beam intensity on the level of 100 kHz, the detector’s material on the beamline should be minimized, the detectors should be able to determine the position of X and Y hit of each beam particle with maximum possible accuracy. During my speech I will present the results of our work.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP22

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Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 13 September 2022

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MOP23

Recent LHC SR Interferometer Simulations and Experimental Results

88

D. Butti, E. Bravin, G. Trad
CERN, Meyrin, Switzerland
S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom

At the CERN Large Hadron Collider (LHC), among the different systems exploiting Synchrotron Radiation (SR) for beam diagnostics, interferometry is under study as a non-invasive technique for measuring absolute beam transverse sizes. Extensive numerical simulations, recently completed for characterising the spatial coherence of the LHC SR source, facilitated the optimisation of the LHC interferometer design and the existing prototype system tested in the past has been refurbished to include the new simulation findings. This contribution describes the simulation specificity and then focuses on first measurements performed at the beginning of the LHC run 3. Such experiments allowed to obtain a first validation of the expected system performance at the injection energy of 450 GeV. A complete benchmark of the simulations will be carried out in 2022 as soon as the LHC will reach its top energy of 6.8 TeV.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP23

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Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 04 October 2022

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MOP24

Test of a Prototype for Modular Profile and Position Monitors in the Shielding of the 590 MeV Beam Line at HIPA

92

R. Dölling, F. Marcellini, M. Sapinski
PSI, Villigen PSI, Switzerland

A new generation of monitor plugs is under develop-ment as spares for the ageing wire profile monitors and beam position monitors inserted into massive shielding in the target regions of the 590 MeV proton beam line at HIPA. A prototype was installed recently in the beam line to the ultra-cold neutron source UCN, to test the perfor-mance of wire monitor, BPM and modular mechanical design in a low-radiation environment. We report on first measurements with beam.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP24

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Received ※ 08 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 27 November 2022

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MOP26

Bunch Length Measurement Systems at S-DALINAC*

96

A. Brauch, M. Arnold, J. Enders, L.E. Jürgensen, N. Pietralla, S. Weih
TU Darmstadt, Darmstadt, Germany

Funding: *Work supported by DFG (GRK 2128) and the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006).
A high-quality beam is necessary for electron scattering experiments at the superconducting Darmstadt electron linear accelerator S-DALINAC. An optimization of the bunch length to typical values of < 2 ps is performed to reach a high energy resolution of 1e-4. Currently, this is accomplished by inducing a linear momentum spread on the bunch in one of the accelerating cavities. The bunch length can then be measured with a target downstream. This method is time consuming and provides only an upper limit of the bunch length. Two new setups for bunch length measurements will improve the optimization process significantly. On the one hand, a new diagnostic beam line is set up in the low energy beam area. It includes a deflecting copper cavity used for measuring the bunch length by shearing the bunch and projecting its length on a target. On the other hand, a streak camera placed at different positions downstream the injector and the main linac will be used to measure the bunch length. Optical transition radiation from an aluminium coated kapton target is used to perform this measurement. The present layout of both systems and their current status will be presented in this contribution.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP26

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Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 12 November 2022

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MOP27

Design Considerations of the Corrugated Structures in a Vacuum Chamber for Impedance Studies at KARA

100

S. Maier, M. Brosi, H.J. Cha, A. Mochihashi, A.-S. Müller, M.J. Nasse, P. Schreiber, M. Schwarz
KIT, Karlsruhe, Germany

Funding: Supported by the DFG project 431704792 in the ANR-DFG collaboration project ULTRASYNC and by the Doctoral School KSETA.
Two parallel, corrugated plates will be installed at the KIT storage ring KARA (KArlsruhe Research Accelerator). This impedance manipulation structure can be used to study and eventually control the electron beam dynamics and the emitted coherent synchrotron radiation (CSR) at KARA. In this contribution, we present the design of the impedance manipulation structure with corrugated plates, simulation results showing the influence of different corrugation parameters on its impedance, and the impact of this additional impedance source on the temporal changes in the emitted CSR in the presence of the microbunching instability.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP27

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Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 07 December 2022

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MOP28

Improvements in Longitudinal Phase Space Tomography at PITZ

105

N. Aftab, Z. Aboulbanine, P. Boonpornprasert, G.Z. Georgiev, J. Good, M. Groß, A. Hoffmann, M. Krasilnikov, X.-K. Li, A. Lueangaramwong, R. Niemczyk, A. Oppelt, H.J. Qian, C.J. Richard, F. Stephan, G. Vashchenko
DESY Zeuthen, Zeuthen, Germany
W. Hillert
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
A.J. Reader
KCL, London, United Kingdom

Methodical studies to improve the longitudinal phase space (LPS) tomography of space-charge dominated electron beams were carried out at the Photo Injector Test facility at DESY in Zeuthen (PITZ). An analytical model was developed to quantify mean momentum, RMS energy spread, bunch length and phase advance. Phase advance analysis determined the booster phase scan range and step size to be used for obtaining momentum projections. A slit was introduced before the booster to truncate the beam in transverse plane to strongly reduce the space charge effects. The signal resolution of this truncated beam was improved by careful beta function control at the reference screen of the momentum measurements. The reconstruction algorithm was changed from Algebraic Reconstruction Technique (ART) to Image Space Reconstruction Algorithm (ISRA) owing to its assurance of non-negative solutions. In addition, the initial physically justified assumption of LPS, based on low-energy section measurements, was established to clear out noise-like artefacts. This paper will highlight the improvements made in the LPS tomography and compare the simulated and experimental results.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP28

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Received ※ 06 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 15 October 2022

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MOP29

Low Gain Avalanche Detector Application for Beam Monitoring

109

V. Kedych, T. Galatyuk, W. Krüger
TU Darmstadt, Darmstadt, Germany
T. Galatyuk, S. Linev, J. Pietraszko, C.J. Schmidt, M. Träger, M. Traxler, F. Ulrich-Pur
GSI, Darmstadt, Germany
J. Michel
Goethe Universität Frankfurt, Frankfurt am Main, Germany
A. Rost
FAIR, Darmstadt, Germany
V. Svintozelskyi
Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

Funding: This work has been supported by DFG under GRK 2128
The S-DALINAC is a superconductive linear electron accelerator operating at 3 GHz and allows operation in energy recovery mode (ERL). For the operation in the ERL mode accelerated and decelerated beams travel inside the same beamline but not necessarily share the same orbit. That leads to a bunch rate of 6 GHz. Non-destructive monitoring tools that allow optimization of acceleration and deceleration processes and achieve high recovery efficiency are important for operation in the ERL mode. The Low Gain Avalanche Detector (LGAD) is a silicon detector with internal gain layer optimized for 4-D tracking with timing resolution below 50 ps* which makes it a promising candidate for beam time structure monitoring. In this contribution we present the status of the first proof of principle beam time structure measurement with LGAD sensors at S-DALINAC in normal operation mode together with future activities overview.
* J.Pietraszko, et al., Low Gain Avalanche Detectors for the HADES reaction time (T0) detector upgrade, Eur. Phys. J. A 56, 183 (2020)

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP29

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Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 16 October 2022

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MOP31

Automatic Adjustment and Measurement of the Electron Beam Current at the Metrology Light Source (MLS)

113

Y. Petenev, J. Feikes, J. Li
HZB, Berlin, Germany
A.B. Barboutis, R. Kleinpresenter, M. Müller
PTB, Berlin, Germany

The electron storage ring MLS (Metrology Light Source) is used by the Physikalisch-Technische Bundesanstalt (PTB), the German metrology institute, as a primary source standard of calculable synchrotron radiation in the ultraviolet and vacuum ultraviolet spectral range. For this, all storage ring parameters have to be appropriately set and measured with high uncertainty. E.g., the electron beam current can be varied by more than 11 orders. This adjustment of the electron beam current, and thus the spectral radiant intensity of the synchrotron radiation, for the specific calibration task is conveniently performed fully automatic by a computer program.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP31

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Received ※ 01 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 15 October 2022

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MOP32

Analog Front End for Measuring 1 to 250 pC Bunch Charge at CLARA

117

S.L. Mathisen, T.H. Pacey, R.J. Smith
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

As part of the development of the CLARA electron accelerator at Daresbury Laboratory, a new analog front end for bunch charge measurement has been developed to provide accurate measurements across a wide range of operating charges with repetition rates of up to 400 Hz. The qualification tests of the front end are presented. These include tests of the online calibration system, compared to a bench Faraday cup test setup; online beam test data with a Faraday cup from 1 to 200 pC; online beam test data with a wall current monitor from 1 to 200 pC, and tests using signal processing such as singular value decomposition. This is demonstrated to enable the measurement of bunch charges in the order of 100 fC using both Faraday Cups and Wall Current Monitors.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP32

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

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MOP33

Beam Current Measurements at the Nano-Ampere Level Using a Current Transformer

121

M. Xiao
UMCG, Groningen, The Netherlands
S. Brandenburg, M.J. Goethem
PARTREC, Groningen, The Netherlands
T. Delaviere, L. Dupuy, F. Stullepresenter
BERGOZ Instrumentation, Saint Genis Pouilly, France

In conventional proton therapy (PT) typical beam currents are of the order of 1 nA. At these currents dose monitoring is reliably achieved with an ionization chamber. However, at the very high dose rates used in FLASH irradiations (employing beam currents >100 nA) ionization chambers will exhibit large intensity dependent recombination effects and cannot be used. A possible solution is a current transformer. Here we report on the performance of the LC-CWCT (Bergoz Instrumentation, France) which has been developed to push noise floor of such non-destructive current measurement systems into the nano-ampere range. We present first beam current measurements at the PARTREC cyclotron (Netherlands). Beam currents measured by the LC-CWCT and a Faraday Cup were shown to linearly correlate up to the maximum intensity of 400 nA used in the measurements. For pulsed beams, charge measured by the LC-CWCT linearly correlated with pulse length over the measurement range from 50 to 1000 µs. Measurement noise as low as 2.8 nA was achieved. The results confirm that the LC-CWCT has the potential to be applied in FLASH PT for accurate determination of beam current and macro pulse charge.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP33

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Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 14 September 2022

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MOP34

New X-Rays Diagnostics at ESRF: The X-BPMs and the Halo-Monitor

125

E. Buratin, K.B. Scheidt
ESRF, Grenoble, France

Two new X-ray diagnostics have been installed in the Front-Ends of the Storage Ring of the ESRF’s Extremely Brilliant Source (EBS) recently. Two independent optical X-BPMs at 23m distance from their bending magnet source-point are giving extremely useful additional information on the vertical beam stability in comparison to the e-BPMs data. A vertical beam Halo-monitor allows to measure permanently and quantitatively the level the electron density at large distance (1-3mm) from the beam core, in a non-destructive manner.

Poster MOP34 [1.198 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP34

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Received ※ 30 August 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 27 November 2022

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MOP35

New Measurements Using Libera-Spark Electronics at ESRF: The High Quality Phase-Monitor and the Single-Electron

129

E. Buratin, N. Benoist, P.B. Borowiec, G. Denat, J. Jacob, K.B. Scheidt, F. Taoutaou
ESRF, Grenoble, France

Several new diagnostics have been installed and exploited at the ESRF’s new Extremely Brilliant Source (EBS) in 2022. A Libera-Spark BPM device has been implemented to measure the phase of Booster and EBS rings, with high resolution and up to turn-by-turn rate. In the Storage Ring we achieved irrefutably the control, injection and measurement of single electron(s) with the use of transfer-line screens, the visible-light extraction system and a low-cost photo-multiplier tube, combined with the commercial Spark Beam Loss Monitor. Further planned developments, like the TCPC technique, on this are on-going and will be essential to verify that our Booster cleaning process reaches a level of zero-electron bunch pollution in EBS.

Poster MOP35 [2.094 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP35

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Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 17 November 2022

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MOP36

Novel Beam Excitation System Based on Software-Defined Radio

133

P.J. Niedermayer, R. Singh
GSI, Darmstadt, Germany

Funding: This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under GA No 101004730.
A signal generator for transverse excitation of stored particle beams is developed and commissioned at GSI SIS18. Thereby a novel approach using a software-defined radio system and the open-source GNU Radio ecosystem is taken. This allows for a low cost yet highly flexible setup for creating customizable and tuneable excitation spectra. Due to its open-source nature, it has the potential for long term maintainability and integrability into the accelerator environment. Furthermore, this opens up the possibility to easily share algorithms for the generation of waveforms across accelerator facilities. As a first application, the device is used to control the coherence and amplitude of transverse oscillations by excitation in the vicinity of betatron sidebands. It enables measurement of beam parameters like tune and chromaticity. On a longer term, it will be used for more complex tasks such as beam shaping, extraction and automated parameter scans towards these complex processes.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP36

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Received ※ 31 August 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 10 November 2022

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MOP37

Beam Polarization Measurements with the Revised Compton Polarimeter at ELSA

137

M.T. Switka, K. Desch, D. Elsner
ELSA, Bonn, Germany
W. Hillert
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany

The Compton Polarimeter at the ELSA 3.2 GeV storage ring has been designed to measure the polarization degree of the stored electron beam by analyzing the profile of the back-scattered gamma-beam with a silicon microstrip detector. Utilizing a scattering asymmetry from interaction with circularly polarized laser light, the electron beam polarization is determined from the vertical shift of the gamma-beam’s center of gravity in respect to the handedness of the laser light. The installation of a new laser source and silicon strip detector has improved the polarimeter’s performance significantly. Additionally, the profile analysis could be enhanced by using a Pearson type peak function fit. The analyzing power was determined through the observation of the Sokolov-Ternov effect and a statistical measurement accuracy of 2 % could be obtained within 5 minutes of measurement time. The polarimeter resolves the expected spin dynamical effects occurring in the storage ring and has shown to be a robust and reliable measurement system for operation with the GaAs source for polarized electrons.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP37

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Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 19 September 2022

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MOP38

Beam Profile Monitoring and Distributed Analysis Using the RabbitMQ Message Broker

140

D. Proft, K. Desch, D. Elsner, F. Frommberger, S. Kronenberg, A. Spreitzer, M.T. Switkapresenter
ELSA, Bonn, Germany

The ELSA facility utilizes several digital cameras for beam profile measurements on luminous screens and synchrotron radiation monitors. Currently a multitude of devices with analog signal output are being replaced in favor of digital outputs, preferably with data transfer via Ethernet. The increased network traffic for streaming, analyzing, and distribution of processed data to control system and machine operators is managed through a supplementary camera network in which distributed computing is performed by the RabbitMQ message broker. This allows performant and platform-independent image acquisition from multiple cameras, real time profile analysis, and supports programming interfaces for C++ and Python. The setup and performance of the implementation are presented.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP38

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Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 28 October 2022

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MOP39

Development of Compact Radio Frequency Sources

144

M.S. McCallum, A. Lyapin
JAI, Egham, Surrey, United Kingdom

Funding: This work is supported by STFC’s Impact Acceleration Account scheme.
Our group is developing a family of compact radio frequency sources aiming to cover 50 MHz to 20 GHz with several models. The primary goal is to provide an alternative to using expensive laboratory generators in permanent installations. In addition, we work towards providing a higher specification than similar telecommunications devices as this is a typical requirement in accelerator instrumentation. We take a minimalistic approach with only a network interface planned, assuming that such a device operates remotely in a large facility. An EPICS interface is in the works for monitoring and control. In this paper, we present the results of rapid prototyping with XMicrowave components. The first measurements show encouraging phase noise performance and spectral purity.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP39

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Received ※ 08 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 02 November 2022

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MOP40

Synchronous Data Service at the European Spallation Source

148

R. Titmarsh
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J.F. Esteban Müller, J.P.S. Martins
ESS, Lund, Sweden

The Synchronous Data Service (SDS) is a tool to monitor and capture events in the European Spallation Source, building on top of the EPICS control system. Large amounts of data from different input output controllers are acquired and synchronised at the level of beam pulses. The acquisition can be triggered by beam events though the timing system or manually by a user. Captured data is stored in standardised NeXus files and indexed in a database for easy searching and retrieval.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP40

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

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MOP42

KINGFISHER: A Framework for Fast Machine Learning Inference for Autonomous Accelerator Systems

151

L. Scomparin, E. Blomley, E. Bründermann, M. Caselle, T. Dritschler, A. Kopmann, A. Mochihashi, A.-S. Müller, A. Santamaria Garcia, P. Schreiber, J.L. Steinmann, M. Weber
KIT, Eggenstein-Leopoldshafen, Germany
T. Boltz
SLAC, Menlo Park, California, USA

Modern particle accelerator facilities allow new and exciting beam properties and operation modes. Traditional real-time control systems, albeit powerful, have bandwidth and latency constraints that limit the range of operating conditions currently made available to users. The capability of Reinforcement Learning to perform self-learning control policies by interacting with the accelerator is intriguing. The extreme dynamic conditions require fast real-time feedback throughout the whole control loop from the diagnostic, with novel and intelligent detector systems, all the way to the interaction with the accelerator components. In this contribution, the novel KINGFISHER framework based on the modern Xilinx Versal devices will be presented. Versal combines several computational engines, specifically combining powerful FPGA logic with programmable AI Engines in a single device. Furthermore, this system can be natively integrated with the fastest beam diagnostic tools already available, i.e. KAPTURE and KALYPSO.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP42

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

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MOP43

Web-Based Application for Cable Simulation Models

156

M.C. Paniccia, S.L. Clark, D.M. Gassner, R.L. Hulsart, P. Thieberger
BNL, Upton, New York, USA

Attenuation in a lossy coaxial cable increases over distance and varies over frequency. Having a model of these variations can help predict the expected loss and distortion of a signal. This paper discusses a free web-based application developed to provide accurate SPICE models for various coaxial cable types. The user can specify a length and select between different cable types, or upload their own cable attenuation curve, and receive a SPICE model for that cable. These simulation models have been used to assist the design and development of new instrumentation systems for the future Electron Ion Collider (EIC).

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP43

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Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 22 November 2022

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MOP44

Novel Photoemission Type X-Ray Beam Position Monitor for the "White" Undulator Radiation

159

P. Ilinski
MAX IV Laboratory, Lund University, Lund, Sweden

Funding: Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research council, the Swedish Governmental Agency for Innovation Systems, and Formas.
A novel photoemission type of X-ray Beam Position Monitor (XBPM) for the ’white’ undulator radiation is proposed. The XBPM employs beamline frontend fixed mask as a source of photocurrent signal. Signal spatial distribution and XBPM response were analyzed for various undulator radiation parameters.

Poster MOP44 [0.962 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP44

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Received ※ 02 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 19 September 2022

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MOP45

A New Luminosity Monitor for the LHC Run 3

163

S. Mazzoni, W. Andreazza, E. Balci, D. Belohrad, E. Bravin, N.S. Chritin, J.C. Esteban Felipe, T. Lefèvre, M. Martin Nieto, M. Palm
CERN, Meyrin, Switzerland

The Beam Rate of Neutrals (BRAN) is a monitor that provides a relative luminosity measurement for the four LHC experiments. BRANs are used during operations as a tool to find and optimise collision and to cross-check experiments luminosity monitors. While each LHC experiments is equipped with BRANs, in this contribution we will focus on the new monitors installed for ATLAS and CMS that will replace the current ageing gas chambers during LHC run 3. These will also serve as as prototypes for the future High Luminosity LHC monitors that will need to sustain an even higher collision rate. A description of the BRAN as well as the first results obtained during the LHC Run 3 start-up will be presented.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP45

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Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 14 September 2022 — Issue date ※ 23 November 2022

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