Keyword: operation
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MOP02 An Optical Diagnostic Beamline for the Bessy II Booster booster, cavity, injection, diagnostics 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 icon 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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MOP09 Towards Higher Stability in Large Scale Cavity BPM Systems cavity, collider, electron, wakefield 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 network, optics, coupling, controls 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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MOP14 Design and Implementation of an FPGA-Based Digital Processor for BPM Applications FPGA, simulation, GUI, feedback 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 icon 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 factory, electron, insertion-device, photon 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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MOP29 Low Gain Avalanche Detector Application for Beam Monitoring linac, monitoring, detector, electron 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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MOP42 KINGFISHER: A Framework for Fast Machine Learning Inference for Autonomous Accelerator Systems controls, feedback, FPGA, interface 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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MOP44 Novel Photoemission Type X-Ray Beam Position Monitor for the "White" Undulator Radiation undulator, radiation, polarization, electron 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 icon 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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TUP01 Commissioning of the Libera Beam Loss Monitoring System at SPEAR3 injection, septum, detector, storage-ring 211
  • K. Tian, S. Condamoor, W.J. Corbett, N.L. Parry, J.A. Safranek, J.J. Sebek, F. Toufexis
    SLAC, Menlo Park, California, USA
  SPEAR3 is a third generation synchrotron radiation light source, which operates approximately 9 months each year with a very high reliability. The beam loss monitoring system in the storage ring has recently been upgrade to the modern Libera system from the original legacy hardware. During the initial stage of the new beam loss monitoring system deployment, it was proved to be useful for a new lattice commissioning at SPEAR3. In this paper, we will report the progress in the Libera system commissioning at SPEAR3 and present some first results.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP01  
About • Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 03 November 2022
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TUP03 The Beam Loss Monitoring System after the LHC Long Shutdown 2 at CERN electron, electronics, detector, monitoring 220
  • M. Saccani, E. Effinger, W. Viganò, C. Zamantzas
    CERN, Meyrin, Switzerland
  Most of the LHC systems at CERN were updated during the Long Shutdown 2, from December 2018 to July 2022, to prepare the accelerator for High-Luminosity. The Beam Loss Monitoring system is a key part of the LHC’s instrumentation for machine protection and beam optimisation by producing continuous and reliable measurements of beam losses along the accelerator. The BLM system update during LS2 aims at providing better gateware portability to future evolutions, improving significantly the data rate in the back-end processing and the software efficiency, and adding remote command capability for the tunnel electronics. This paper first recalls the Run 1 and Run 2 BLM system achievements, then reviews the main changes brought during LS2, before focusing on the commissioning phase of Run 3 and future expectations.  
poster icon Poster TUP03 [2.871 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP03  
About • Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 29 October 2022
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TUP05 Experience with Machine Protection Systems at PIP2IT MEBT, controls, hardware, MMI 229
  • A. Warner, M.R. Austin, L.R. Carmichael, J.-P. Carneiro, B.M. Hanna, E.R. Harms, M.A. Ibrahim, R. Neswold, L.R. Prost, R.A. Rivera, A.V. Shemyakin, J.Y. Wu
    Fermilab, Batavia, Illinois, USA
  Funding: * This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics
The PIP2IT accelerator was assembled in multiple stages in 2014 - 2021 to test concepts and components of the future PIP-II linac that is being constructed at Fermilab. In its final configuration, PIP2IT accelerated a 0.55 ms x 20 Hz x 2 mA H beam to 16 MeV. To protect elements of the beam line, a Machine Protection System (MPS) was implemented and commissioned. The beam was interrupted faster than 10 µs when excessive beam loss was detected. The paper describes the MPS architecture, methods of the loss detection, procedure of the beam interruption, and operational experience at PIP2IT.
poster icon Poster TUP05 [1.233 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP05  
About • Received ※ 05 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 18 September 2022
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TUP10 Development of a New Measurement System for Beam Position Pickups in the LINAC and Beam Energy Measurement (Time of Flight) in the MEBT for Medaustron pick-up, LLRF, synchrotron, linac 238
  • M. Repovž, M. Cerv, C. Kurfürst, G. Muyan, S. Myalski, A. Pozenel, C. Schmitzer, M. Wolf
    EBG MedAustron, Wr. Neustadt, Austria
  • A. Bardorfer, B. Baričevič, P. Paglovec, M. Škabar
    I-Tech, Solkan, Slovenia
  The MedAustron Ion Therapy Centre is a synchrotron-based particle therapy facility which delivers proton and carbon beams for clinical treatment. Currently, the facility treats roughly 40 patients per day and is improving its systems and workflows to further increase this number. MedAustron was commissioned and is operational without fully integrated systems for measurements of ’time of flight’ (beam energy) in the MEBT and beam position in the LINAC. This paper presents the newly developed system for these use cases, which will improve the overall commissioning and QA accuracy. It will unify the hardware used for the cavity regulation in the injector LLRF and the synchrotron LLRF. It will also be used for SYNC pickups, Schottky monitors and RF knock-out exciter. The new system is based on the CotS MicroTCA platform, which is controlled by the MedAustron Control System based on NI-PXIe. Currently it supports fiber-optic links (SFP+), but other links (e.g. EPICS, DOOCS) can be established. The modular implementation allows for connections to other components, such as motors, amplifiers, or interlock systems and will increase the robustness and maintainability of the accelerator.  
poster icon Poster TUP10 [2.590 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP10  
About • Received ※ 04 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 28 September 2022
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TUP34 LHC Schottky Spectrum from Macro-Particle Simulations simulation, synchrotron, betatron, MMI 308
  • C. Lannoy, D. Alves, N. Mounet
    CERN, Meyrin, Switzerland
  • C. Lannoy, T. Pieloni
    EPFL, Lausanne, Switzerland
  • K. Łasocha
    Jagiellonian University, Kraków, Poland
  We introduce a method for building Schottky spectra from macro-particle simulations performed with the PyHEADTAIL code, applied to LHC beam conditions. In this case, the use of a standard Fast Fourier Transform (FFT) algorithm to recover the spectral content of the beam becomes computationally intractable memory-wise, because of the relatively short bunch length compared to the large revolution period. This would imply having to handle an extremely large amount of data for performing the FFT. To circumvent this difficulty, a semi-analytical method was developed to compute efficiently the Fourier transform. The spectral content of the beam is calculated on the fly along with the macro-particle simulation and stored in a compact manner, independently from the number of particles, thus allowing the processing of one million macro-particles in the LHC, over 10’000 revolutions, in a few hours, on a regular computer. The simulated Schottky spectrum is then compared against theoretical formulas and measurements of Schottky signals previously obtained with lead ion beams in the LHC.  
poster icon Poster TUP34 [1.864 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP34  
About • Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 01 December 2022
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TUP38 Deep Neural Network for Beam Profile Classification in Synchrotron network, diagnostics, emittance, synchrotron 323
  • M. Piekarski
    NSRC SOLARIS, Kraków, Poland
  Funding: The presented work has been achieved in collaboration with AGH University of Science and Technology in Kraków as a part of a PhD thesis.
The main goal of NSRC SO­LARIS is to pro­vide sci­en­tific com­mu­nity with high qual­ity syn­chro­tron light. To achieve this, it is necessary to constantly monitor many subsystems responsible for beam stability and to analyze data about the beam itself from various diagnostic beamlines. In this work a deep neural net­work for transverse beam profile classification is pro­posed. Main task of the system is to automatically assess and classify transverse beam profiles based solely on the evaluation of the beam image from the Pinhole diagnostic beamline at SOLARIS. At the present stage, a binary assignment of each profile is performed: stable beam operation or unstable beam operation / no beam. Base model architecture consists of a pre-trained con­vo­lu­tional neural net­work followed by a densely-connected classifier and the system reaches accuracy at the level of 90%. The model and the results obtained so far are discussed, along with plans for future development.
poster icon Poster TUP38 [0.376 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP38  
About • Received ※ 30 August 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 October 2022
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TUP39 Neural Network Inverse Models for Implicit Optics Tuning in the AGS to RHIC Transfer Line quadrupole, network, diagnostics, controls 327
  • J.P. Edelen, N.M. Cook, J.A. Einstein-Curtis
    RadiaSoft LLC, Boulder, Colorado, USA
  • K.A. Brown, V. Schoefer
    BNL, Upton, New York, USA
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Award Number DE-SC0019682
One of the fundamental challenges of using machine-learning-based inverse models for optics tuning in accelerators, particularly transfer lines, is the degenerate nature of the magnet settings and beam envelope functions. Moreover, it is challenging, if not impossible, to train a neural network to compute correct quadrupole settings from a given set of measurements due to the limited number of diagnostics available in operational beamlines. However, models that relate BPM readings to corrector settings are more forgiving, and have seen significant success as a benchmark for machine learning inverse models. We recently demonstrated that when comparing predicted corrector settings to actual corrector settings from a BPM inverse model, the model error can be related to errors in quadrupole settings. In this paper, we expand on that effort by incorporating inverse model errors as an optimization tool to correct for optics errors in a beamline. We present a toy model using a FODO lattice and then demonstrate the use of this technique for optics corrections in the AGS to RHIC transfer line at BNL.
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP39  
About • Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 12 November 2022
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TUP40 Photon Polarization Switch at ALBA polarization, electron, radiation, synchrotron 331
  • L. Torino, G. Benedetti, F.F.B. Fernández, U. Iriso, Z. Martí, J. Moldes, D. Yépez
    ALBA-CELLS, Cerdanyola del Vallès, Spain
  The polarization of the synchrotron radiation produced by a bending magnet can be selected by properly choosing the vertical emission angle. At beamlines this can be done by moving a slit to cut out unwanted polarization: this method is time consuming and not very reproducible. Another option is to fix the slit position and generate a local bump with the electron beam, and vary the emission angle at the source point such that the slit is illuminated with the desired polarization. At ALBA, we have implemented this option within the Fast Orbit Feedback, which allows to perform the angle switch in less than one minute without affecting the other beamlines. This report describes the implementation of this technique for the dipole beamline MISTRAL at the ALBA Synchrotron.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP40  
About • Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 10 November 2022
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WE2C2 Beam Stability in the MAX IV 3 GeV Storage Ring electron, storage-ring, feedback, synchrotron 370
  • J. Breunlin, G. Felcsuti
    MAX IV Laboratory, Lund University, Lund, Sweden
  The MAX IV Laboratory, inaugurated in 2016, hosts a 3 GeV ultra-low emittance storage ring, a 1.5 GeV storage ring and a linear accelerator driven Short Pulse Facility to deliver synchrotron radiation to scientific users. A Stability Task Force has been assigned to ensure the delivery of stable beams since early on in the design phase of the laboratory and is continuing its work in an ongoing and multi-disciplinary effort. Measurements of the electron beam stability resulting from the passive stabilization approach taken for the two storage rings will be presented, as well as figures of beam stability with the Fast Orbit Feedback system in operation. Each ID beamline in the 3 GeV storage ring is equipped with a pair photon beam position monitors that are currently used to complement the electron beam position monitors. In the light of the city development around the MAX IV campus, maintaining the good mechanical stability of the laboratory has to be seen as an ongoing effort. A number of studies are being performed to identify possible risks and to decide where measures need to be taken.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WE2C2  
About • Received ※ 12 September 2022 — Accepted ※ 15 September 2022 — Issue date ※ 12 October 2022  
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WEP06 An LHC Protection System Based on Fast Beam Intensity Drops Windows, FPGA, detector, emittance 387
  • M. Gąsior, T.E. Levens
    CERN, Meyrin, Switzerland
  The Large Hadron Collider (LHC) is protected against potentially dangerous beam losses by a distributed system based on some four thousand beam loss monitors. To provide an additional level of safety, the LHC has been equipped with a system to detect fast beam intensity drops and trigger a beam dump for potentially dangerous rates. This paper describes the architecture of the system and its signal processing, optimized to cope with dump thresholds in the order of 0.01 % of the circulating beam intensity. The performance of the installed system is presented based upon beam measurements.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP06  
About • Received ※ 10 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 22 November 2022
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WEP08 Upgrade of the BPM Long Term Drift Stabilization Scheme Based on External Crossbar Switching at PETRA III electron, electronics, emittance, beam-losses 395
  • G. Kube, F. Schmidt-Föhre, K. Wittenburg
    DESY, Hamburg, Germany
  • A. Bardorfer, L. Bogataj, M. Cargnelutti, P. Leban, M.O. Oblak, P. Paglovec, B. Repič
    I-Tech, Solkan, Slovenia
  PETRA IV at DESY will be an upgrade of the present synchrotron radiation source PETRA III into an ultra low-emittance source with beam emittance of about 20 pm.rad which imposes stringent requirements on the machine stability. In order to measure beam positions and control orbit stability to the required level of accuracy, a high resolution BPM system will be installed which consists of about 800 monitors with the readout electronics based on MTCA.4. In order to fulfill the requested long-term drift requirement (< 1 micron over 7 days), also the BPM cable paths have to be stabilized because of the PETRA-specific machine geometry. To achieve this, the crossbar switching concept was extended such that the analogue switching part is separated from the read-out electronics and brought as close as possible to the BPM pickup. While first measurements were presented before, meanwhile the system has undergone a major revision, especially the external switching matrix changed from a prototype setup to a system close to the final design. This contribution summarizes the latest measurements from PETRA III, demonstrating the high performance of the external stabilization concept.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP08  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 18 October 2022
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WEP21 Merits of Pulse Mode Operation of Residual Gas Ionization Profile Monitor for J-PARC Main Ring electron, injection, emittance, ECR 434
  • K. Satou, Y. Sato
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • S. Igarashi
    KEK, Ibaraki, Japan
  Funding: Accelerator and Beamline Research and Technology Development for High-Power Neutrino Beams in the U.S.-Japan Science and Technology Cooperation Program in High Energy Physics.
The measurement accuracy of the ionization profile monitor (IPM) of J-PARC main ring (MR) depends on the flatness and stability of the gain of the position-sensitive microchannel plate (MCP). The flatness of the MCP deteriorates after long-term operation; the gain of the central area selectively decreases as the integrated output charge increases. The beam-based calibration, where the local bump shifts the beam and the reconstructing beam profiles determine the gain distribution, is used to calibrate the flatness. The immediate gain drop occurs when the output current from the MCP becomes comparable to the bias current is problematic. This gain drop depends on the bias voltage and the output current; thus, it is difficult to calibrate. A pulsed HV module of 30 kV, which collects ionized electrons and ions, was installed to solve these problems. The pulse mode operation can modulate the averaged output current from the MCP to improve gain stability. Profiles of the intense beam up to 3.3·1013 ppb were measured and compared with those measured by destructive profile monitors in beam transport lines 3’50 BT, and the Abort line. Estimated emittances were consistent at ±20%.
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP21  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 16 October 2022
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WEP22 Experimental Investigation of Gold Coated Tungsten Wires Emissivity for Applications in Particle Accelerators detector, experiment, vacuum, controls 438
  • A. Navarro Fernandez, M. Martin Nieto, F. Roncarolo
    CERN, Meyrin, Switzerland
  The operation of wire grids and wire scanners as beam profile monitors can be heavily affected, both in terms of measurement accuracy and wire integrity, by the thermal response of the wires to the energy deposited by the charged particles. Accurate measurements of material emissivity are crucial, as Radiative Cooling represent the most relevant cooling process. In this work, we present a method for emissivity measurements of gold-coated tungsten wires based on calorimetric techniques. The dedicated electrical setup allowed allowed transient and steady state measurements for temperatures up to 2000 K. A theoretical description of the measurement technique will be followed up by the electrical set up description and a detailed discussion about the measured results and uncertainties.  
poster icon Poster WEP22 [1.586 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP22  
About • Received ※ 06 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 16 September 2022
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WEP26 Status of a Monitor Design for Single-Shot Electro-Optical Bunch Profile Measurements at FCC-ee laser, electron, simulation, wakefield 455
  • M. Reißig, E. Bründermann, S. Funkner, B. Härer, A.-S. Müller, G. Niehues, M.M. Patil, R. Ruprecht, C. Widmann
    KIT, Eggenstein-Leopoldshafen, Germany
  Funding: Supported by the Doctoral School KSETA. C. W. achnowledges funding by BMBF contract number 05K19VKD. FCCIS is funded by the EU’s Horizon 2020 research and innovation programme under grant No 951754.
At the KIT electron storage ring KARA (Karlsruhe Research Accellerator) an electro-optical (EO) near-field monitor is in operation performing single-shot, turn-by-turn measurements of the longitudinal bunch profile using electro-optical spectral decoding (EOSD). In context of the Future Circular Collider Innovation Study (FCCIS), a similar setup is investigated with the aim to monitor the longitudinal bunch profile of each bunch for dedicated top-up injection at the future electron-positron collider FCC-ee. This contribution presents the status of a monitor design adapted to cope with the high-current and high-energy lepton beams foreseen at FCC-ee.
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP26  
About • Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 24 September 2022
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WEP28 Studies on Radially Coupled Fast Faraday Cups to Minimize Field Dilution and Secondary Electron Emission at Low Intensities of Heavy Ions impedance, electron, insertion, simulation 460
  • G.O. Rodrigues, S. Kumar, K. Mal, R. Mehta, C.P. Safvan
    IUAC, New Delhi, India
  • R. Singh
    GSI, Darmstadt, Germany
  Fast Faraday Cups (FFCs) are interceptive beam diagnostic devices used to measure fast signals from sub-nanosecond bunched beams and the operation of these devices is a well-established technique. However, for short bunch length measurements in non-relativistic regimes with ion beams, the measured profile is diluted due to field elongation and distortion by the emission of secondary electrons. Additionally, for short bunches with the expected intensities envisaged in the High Current Injector at the Inter University Accelerator Centre, the impedance matching of the EM structure puts severe design constraints. This work presents a detailed study on the modification of a radially-coupled coaxial FFC [1]. The field dilution and secondary electron emission aspects are modelled through EM simulations and techniques to minimise these effects are explored. This has resulted in a new design, which has a better signal to noise ratio and benefits from a more accurate bunched beam measurement.
[1] Carneiro, J.-P., et al. ’Longitudinal Beam Dynamics Studies at the Pip-II Injector Test Facility.’ International Journal of Modern Physics A, vol. 34, no. 36, 2019, p.1942013
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP28  
About • Received ※ 03 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 25 October 2022 — Issue date ※ 28 November 2022
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