MO3 —  Monday Session 3   (11-Sep-23   13:30—15:40)
Chair: K. Satou, KEK, Tokai, Ibaraki, Japan
Paper Title Page
The Art of Sensing Beam Orbits in Mile-long Accelerators on a Nanometer Scale  
  • D. Padrazo
    BNL, Upton, New York, USA
  The "eyes" that enable us to see the particle beams are called Beam Position Monitors. BPM design is based on detection of electric fields of the bunches passing through electrodes located inside the vacuum chamber. The weak electric signals are filtered, amplified and digitized to provide us with the orbit data. The progress with advancing the BPM accuracy, sensitivity, speed and data volume has escalated manyfold in the last few decades following the rapid growth of capabilities of the modern electronics. In my presentation I will go over the basic principles, the history and the future prospects of BPM diagnostics for particle accelerators. Concurrently I will introduce our home-grown solution for NSLS-II RF BPMs and present the accomplishments to date, experience from operations and studies and an outlook at the future developments in both Analog and Digital domains of our devices. NSLS-II has 250 BPMs that include several generations and our units demonstrate an outstanding level of both reliability and performance.  
slides icon Slides MO3I01 [8.998 MB]  
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Dielectric Pick-Up for Short Bunches  
  • E. Senes, T. Lefèvre
    CERN, Meyrin, Switzerland
  Novel acceleration schemes pose new challenges to the beam instrumentation required. This contribution presents a novel device to measure the beam position, enabling the discrimination of different co-propagating beams. The method leverages the characteristic properties of the Coherent Cherenkov-Diffraction Radiation (ChDR) emitted from dielectric inserts in the beampipe. The beam discrimination is performed in the frequency domain, exploiting the bunch length difference of the two beams. This device was developed for the AWAKE experiment, where not only an electron beam co-propagates with a more intense proton beam, but also traditional pickups are impacted by the environment polluted with spurious charges from the plasma. The electron beam discrimination takes place in a narrow band around 30 GHz. The overall design and results from the AWAKE experiment are presented. The utilisation of coherent ChDR to distinguish different co-propagating beams is a substantial novelty in the field, pushing the instruments capabilities for novel accelerating technologies, such as plasma-based accelerators.  
slides icon Slides MO3I02 [8.860 MB]  
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MO3C03 Development of the SLS 2.0 BPM System 15
  • B. Keil, R. Ditter, F. Marcellini, G.M. Marinkovic, J. Purtschert, M. Rizzi, M. Roggli, D. Stephan, X. Wang
    PSI, Villigen PSI, Switzerland
  After more than 20 years of operation, the storage ring of the Swiss Light Source (SLS) will be replaced. The new ring called SLS 2.0 will have 40 times higher brilliance than SLS, thanks to an innovative low-emittance magnet lattice and a beam pipe with smaller aperture. For SLS 2.0, the ageing SLS BPM electronics will be incrementally replaced for the whole accelerator, including linac, booster, transfer lines and storage ring. This contribution presents the development status and latest prototype test results of the SLS 2.0 BPM system, including BPM pickups, mechanics, and electronics.  
slides icon Slides MO3C03 [5.240 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO3C03  
About • Received ※ 09 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 21 September 2023
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MO3C04 A MTCA Based BPM-System for PETRA IV 19
  • G. Kube, H.T. Duhme, J.L. Lamaack, 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
  The PETRA IV project aims to upgrade the present PETRA III synchrotron into an ultra low-emittance source. The small emittances translate directly into much smaller beam sizes, thus imposing stringent requirements on the machine stability. In order to measure beam positions and control orbit stability to the level of 10% of beam size and divergence, a high resolution BPM system will be installed which consists of 788 individual monitors with the readout electronics based on MTCA.4. In order to fulfil the long-term drift requirement (< 1 micron over 7 days), several analog, digital and SW parts were taken from the Libera Brilliance+ and a new RTM module has been developed to be used as BPM electronics RFFE. In addition, its analogue RF switch matrix used for long-term stabilization was separated and placed close to the BPM pickup, hence enabling an additional stabilization of the RF cables. At present, a fully populated MTCA crate with 6 AMC boards for the readout of 12 BPMs is installed at PETRA III and is extensively being tested. This contribution summarizes the latest beam measurements, demonstrating the high performance of the BPM system and the external stabilization concept.  
slides icon Slides MO3C04 [3.604 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO3C04  
About • Received ※ 06 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 02 October 2023
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MO3C05 Canadian Light Source Beam Position Visualization Tool 24
  • M. Bree, T. Batten, C.W. Stevens, J.M. Vogt
    CLS, Saskatoon, Saskatchewan, Canada
  The CLS Orbit Correction (OC) system acquires, collates, and publishes storage ring beam centroid position information from 48 beam position monitors (BPMs) at a rate of 1000 samples per second. We present a "Storage Ring Beam Position Visualization Tool" that computes and displays dynamic Fast Fourier Transforms (FFTs) and Cumulative Power Spectral Densities (CPSDs) for all BPMs in real-time using full resolution data. The computed FFTs and CPSDs can be plotted in various combinations and in waterfall plots that allow visualization of changes over long periods of time. In addition, correlations between all BPM channel combinations are computed and ranked. Data from any two BPM channels can be selected for plotting in two dimensions wherein correlations are visually apparent. Computed CPSDs are further binned and published in scalar EPICS PVs which are archived for further analysis. Preliminary results from the Beam Position Visualization Tool have proven useful in characterizing beam position noise at the CLS.  
slides icon Slides MO3C05 [197.014 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO3C05  
About • Received ※ 17 July 2023 — Revised ※ 16 August 2023 — Accepted ※ 13 September 2023 — Issue date ※ 26 September 2023
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Industry Introductions  
  • T. Batten
    CLS, Saskatoon, Saskatchewan, Canada
  Opportunity for Industry to provide a brief introduction to the audience.  
slides icon Slides MO3I06 [3.378 MB]  
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