Keyword: electronics
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MOP08 Development of a Waveguide BPM System GUI, electron, coupling, cavity 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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MOP13 Test and Measurements Results of the Pilot Tone Front End Industrialization for Elettra 2.0 electron, Ethernet, controls, instrumentation 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 icon 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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MOP33 Beam Current Measurements at the Nano-Ampere Level Using a Current Transformer experiment, proton, electron, controls 121
  • M. Xiao
    UMCG, Groningen, The Netherlands
  • S. Brandenburg, M.J. Goethem
    PARTREC, Groningen, The Netherlands
  • T. Delaviere, L. Dupuy, F. Stulle
    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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TUP03 The Beam Loss Monitoring System after the LHC Long Shutdown 2 at CERN electron, operation, 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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TUP12 First Application of a Multiprocessing System-on-Chip BPM Electronics Platform at SwissFEL electron, FEL, undulator, cavity 245
  • B. Keil, R. Ditter, M. Gloor, G. Marinkovic, J. Purtschert
    PSI, Villigen PSI, Switzerland
  We have developed a new BPM electronics platform based on a MultiProcessing System-on-Chip (MPSoC). This contribution introduces the first application of the platform at the Paul Scherrer Institute (PSI), which is the cavity BPM system for the SwissFEL soft X-ray undulator beamline called ’Athos’ [1], where a larger number of systems are now operational. Measurement results and differences to the predecessor system will also be presented.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP12  
About • Received ※ 02 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 26 September 2022
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WEP08 Upgrade of the BPM Long Term Drift Stabilization Scheme Based on External Crossbar Switching at PETRA III electron, operation, 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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WEP09 Preliminary Evaluation of the MTCA.4 BPM Electronics Prototype for the PETRA IV Project electron, brilliance, synchrotron, controls 399
  • P. Leban, A. Bardorfer, L. Bogataj, M. Cargnelutti, M.O. Oblak, P. Paglovec, B. Repič
    I-Tech, Solkan, Slovenia
  • G. Kube, F. Schmidt-Föhre, K. Wittenburg
    DESY, Hamburg, Germany
  Within the PETRA IV project at DESY, the synchrotron radiation source PETRA III will be upgraded into a low-emittance source. The small beam emittance and reduced beam size imply stringent requirements on the machine stability. To meet the requirements on position measurement and orbit stability, a high-resolution BPM system will be installed in the new machine, with about 800 BPMs and MTCA.4-based readout electronics. In the TDR phase of the project, I-Tech and DESY are cooperating on the realization of a BPM prototype that will demonstrate the feasibility of reaching the PETRA IV requirements. Several analog, digital and SW parts are taken from the Libera Brilliance+ instrument and are reused in the MTCA.4 BPM prototype, with some innovations. One of them is the separation of the RF switch matrix used for long-term stabilization: placing it near the BPM enables also the long RF cables to be stabilized. An 8 channel RTM board, able to acquire signals from two BPMs was developed and is also tested. This paper presents an overview of the BPM electronics prototype and the promising test results achieved in the Instrumentation Technologies’ laboratory with the first boards produced.  
poster icon Poster WEP09 [3.499 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP09  
About • Received ※ 01 September 2022 — Revised ※ 11 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 23 September 2022
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WEP12 HL-LHC BPM System Development Status cryogenics, vacuum, pick-up, electron 408
  • M. Krupa, I. Degl’Innocenti, D. Gudkov, G. Schneider
    CERN, Meyrin, Switzerland
  • D.R. Bett
    JAI, Oxford, United Kingdom
  The demanding instrumentation requirements of the future High Luminosity LHC (HL-LHC) require 44 newly designed Beam Position Monitors (BPM) to be installed around the ATLAS and CMS experiments in 2026-2028. Three BPM types are now in pre-series production, with two more variants under design. Close to the collision point, a set of cryogenic directive coupler BPMs equipped with a brand new acquisition system based on nearly-direct digitization will resolve the position of the two counter-rotating LHC beams occupying a common vacuum chamber. Other new button and stripline BPMs will provide not only the transverse beam position, but also timing signals for the experiments, and diagnostics for the new HL-LHC crab cavities. This contribution summarizes the HL-LHC BPM specifications, gives an overview of the new BPM designs, reports on the pre-series BPM production status and plans for series manufacturing, outlines the foreseen acquisition system architecture, and highlights the first beam measurements carried out with the proof-of-concept electronics for the directive stripline BPMs.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP12  
About • Received ※ 09 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 03 October 2022
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WEP14 Cavity BPM Electronics for SINBAD at DESY cavity, electron, dipole, interface 413
  • B. Lorbeer, H.T. Duhme, I. Krouptchenkov, T. Lensch, D. Lipka, S. Vilcins, M. Werner
    DESY, Hamburg, Germany
  The SINBAD(Short and INnovative Bunches and Accelerators at DESY ) R&D accelerator is planned for studying new concepts for high gradient electron beam acceleration and the generation of ultra-short electron bunches. The accelerator called ARES(Accelerator Research Experiment At DESY) is composed of S-band accelerating structures. In order to achieve the goal of very short electron bunches the electron beam charges generated in the RF Gun can vary in a range from 1nC down to 500fC. In order to measure the beam position with good resolution at the small charge end of 500fC a new cavity BPM(beam position monitor) has been developed. One key component in the BPM system is the custom RF electronics to meet the resolution requirements in the entire charge range. The entire BPM system with a focus on the system design requirements and the utca based RF electronics are presented in this paper.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP14  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 12 December 2022
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