Keyword: injection
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MOP008 Consideration of Beam Instrumentation for SOLARIS Linac Upgrade linac, diagnostics, lattice, emittance 45
  • A.I. Wawrzyniak, J.B. Biernat, R. Panaś, J.J. Wiechecki, M.T. Ünal
    NSRC SOLARIS, Kraków, Poland
  • A. Curcio
    LNF-INFN, Frascati, Italy
  SOLARIS linac currently operates at 540 MeV and is used as an injector to the storage ring, where after the accumulation the energy is ramped up to 1.5 GeV via two active RF cavities. Top-up injection would be of extreme benefits for user operation, therefore a new 1.5 GeV linac is being designed. The idea is to replace the current machine without infrastructural interventions in terms of tunnel expansion. Performed studies demonstrate that the best solution is provided by a Hybrid S-band/C-band LINAC. One of the main goals is to achieve bunch compression below the picosecond level and low-emittance beams for a future short-pulse facility or a Free Electron Laser. Within this presentation the results of performed simulations will be presented together with the concept of different diagnostics as BPMs, current transformers, YAG screens, coherent diffraction radiation monitor distribution.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP008  
About • Received ※ 08 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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MOP013 Expansion of the MTCA Based Direct Sampling LLRF at MedAustron for Hadron Synchrotron Applications synchrotron, pick-up, diagnostics, hadron 63
  • M. Wolf, M. Cerv, C. Kurfürst, S. Myalski, M. Repovž, C. Schmitzer
    EBG MedAustron, Wr. Neustadt, Austria
  • A. Bardorfer, B. Baričevič, P. Leban, P. Paglovec, M. Škabar
    I-Tech, Solkan, Slovenia
  The MedAustron Ion Therapy Centre is a synchrotron-based particle therapy facility located in Lower Austria, which delivers proton and carbon ion beams for cancer treatments. Currently the facility treats over 400 patients per year and is expected to double this number in the future. Six years since the start of clinical operation, MedAustron is experiencing end-of-life issues concerning the digital Low Level RF components in the injector and the synchrotron. Replacements for these applications are under development and the chosen hardware is suitable to also update multiple beam diagnostic devices in the facility. Main targets for updates are the Schottky monitors, which were never properly integrated into the MedAustron Control system and the position pickup measurement system, which currently does not support turn by turn measurements. Comparison measurements with other state of the art diagnostic devices are ongoing to demonstrate the capabilities of the generic hardware. Furthermore, these measurements should show the increased usability and diagnostic potential compared to the legacy devices.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP013  
About • Received ※ 07 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023
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MOP022 Replacement of the Single-Pass BPM System with MicroTCA.4-based Versatile Electronics at SPring-8 electron, electronics, kicker, timing 74
  • H. Maesaka, N. Hosoda, S. Takano
    RIKEN SPring-8 Center, Hyogo, Japan
  • H. Dewa, T. Fujita, N. Hosoda, H. Maesaka, M. Masaki, S. Takano
    JASRI, Hyogo, Japan
  We have developed MicroTCA.4-based versatile BPM readout electronics for the SPring-8 upgrade project, SPring-8-II (*). The input signals are processed by an rf front-end rear transition module (RTM) with band-pass filters, amplifiers, and step attenuators and digitized by 16-bit 370 MSPS high-speed digitizers on an advanced mezzanine card (AMC). The field-programmable gate array (FPGA) on the AMC calculates both single-pass and COD beam positions. The current BPM system at SPring-8 consists of approximately twenty single-pass dedicated BPMs and over two hundred other COD dedicated ones. In advance of SPring-8-II, so far, we renewed half of the single-pass dedicated BPM electronics to the MicroTCA.4. A graphical user interface (GUI) for the new BPM system was also developed and ready for tuning. The single-pass BPM resolution was confirmed to be better than 100 um for a 100 pC single bunch, sufficient for SPring-8-II. The other existing single-pass BPM electronics will also be renewed this summer. The full renewal of remaining COD dedicated BPM electronics to the versatile MicroTCA.4 ones is planned in the subsequent years before the construction of SPring-8-II.
(*) H. Maesaka et al., "Development of MTCA.4-based BPM Electronics for SPring-8 Upgrade", Proc. IBIC’19, doi:10.18429/JACoW-IBIC2019-WEBO03
poster icon Poster MOP022 [1.074 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP022  
About • Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 30 September 2023
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MOP037 Tune Feedback at the Canadian Light Source feedback, quadrupole, operation, storage-ring 106
  • W.A. Wurtz, C.K. Baribeau, A.M. Duffy
    CLS, Saskatoon, Saskatchewan, Canada
  In order to maintain good injection efficiency for top-up operation at the Canadian Light Source, we must keep the betatron tunes constant even as changes in insertion device fields cause the tunes to vary. To meet this requirement, we implemented a tune feedback system. We measure the tunes at a rate of 1 Hz using Dimtel bunch-by-bunch systems. The transverse feedback function of the bunch-by-bunch systems provides tune measurements without disturbing the electron beam. We adjust two quadrupole families at a rate of 0.25 Hz to control the horizontal and vertical tunes. In this article we describe the tune feedback system, its development and its performance. The system has proven to be very robust, enabling reliable top-up operation.  
poster icon Poster MOP037 [1.284 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP037  
About • Received ※ 24 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 21 September 2023
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MOP044 "Instantaneous" Lifetime Measurement in Storage Ring with Top-Up Injection operation, storage-ring, electron, collider 125
  • I. Pinayev
    BNL, Upton, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
Top-up operation becomes routine in the light sources. The goal of the top-up operation is to keep the current of the circulating beam stable to avoid variations of the heat load on the beamline optics. It is also considered for the electron-ion collider to maintain the polarization of the electron beam. Frequent re-injection makes measurement of the beam lifetime very difficult if possible. Since, only part of the bunch train is refreshed during the injection cycle then the distribution of the bunch charges in the train has a characteristic saw-tooth distribution. The slope of saw tooth and step in the bunch charge distribution is defined by the lifetime and filling frequency. Both parameters can be used for the measurement. The data for processing can be obtained either from fast current transformer or from the raw ADC signal from beam position monitor. In this paper we present the theoretical considerations as well as experimental data from NSLS-II storage ring.
poster icon Poster MOP044 [0.284 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP044  
About • Received ※ 25 August 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 18 September 2023
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WE3I01 Gas Jet-Based Fluorescence Profile Monitor for Low Energy Electrons and High Energy Protons at LHC electron, experiment, photon, distributed 312
  • O. Sedláček, A.R. Churchman, A. Rossi, G. Schneider, C.C. Sequeiro, K. Sidorowski, R. Veness
    CERN, Meyrin, Switzerland
  • M. Ady, S. Mazzoni, M. Sameed
    European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • P. Forck, S. Udrea
    GSI, Darmstadt, Germany
  • O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
  • O. Sedláček, O. Stringer, C.P. Welsch, H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A. Webber-Date
    Cockcroft Institute, University of Liverpool, Liverpool, United Kingdom
  The ever-developing accelerator capabilities of increasing beam intensity, e.g. for High Luminosity LHC (HL-LHC), demand novel non-invasive beam diagnostics. As a part of the HL-LHC project a Beam Gas Curtain monitor (BGC), a gas jet-based fluorescence transverse profile monitor, is being developed. The BGC uses a supersonic gas jet sheet that traverses the beam at 45° and visualizes a two-dimensional beam-induced fluorescent image. The principle of observing photons created by fluorescence makes the monitor insensitive to present electric or magnetic fields. Therefore, the monitor is well suited for high-intensity beams such as low-energy electron beam of Hollow Electron Lens (HEL), and HL-LHC proton beam, either as a profile or an overlap monitor. This talk will focus on the first gas jet measured transverse profile of the 7keV hollow electron beam. The measurements were carried out at the Electron Beam Test Stand at CERN testing up to 5A beam for HEL. A comparison with Optical Transition Radiation measurements shows consistency with the BGC results. The BGC installation of January 2023 at LHC is shown, including past results from distributed gas fluorescence tests.  
slides icon Slides WE3I01 [7.338 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE3I01  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 27 September 2023 — Issue date ※ 02 October 2023
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WEP019 Study of Single Wire Scanner Monitor for FETS-FFA Test Ring simulation, proton, scattering, linac 377
  • E. Yamakawa, S. Machida, A. Pertica, D.W. Posthuma de Boer
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • Y. Ishi
    Kyoto University, Research Reactor Institute, Osaka, Japan
  • A.P. Letchford
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • T. Uesugi
    Kyoto University, Institute for Integrated Radiation and Nuclear Science, Osaka, Japan
  To confirm the use of Fixed Field Alternating gradient accelerator (FFA) as a high power pulsed neutron spallation source, a prototype called FETS-FFA is studied at Rutherford Laboratory (RAL). A single Wire Scanner Monitor (WSM) is planned to be used to measure a beam position and a beam profile in the ring. One of the concerns of this monitor is the thermal damage on the Carbon Nano Tube (CNT) wire due to high energy deposition of low energy proton beam in FETS-FFA (3 - 12 MeV). Furthermore, to measure a beam profile during beam acceleration in the ring, a diameter of CNT wire needs to be smaller than the orbit displacements in turns. To confirm whether a single WSM is suitable for FETS-FFA ring, two different beam tests were performed at RAL and at the Institute for Integrated Radiation and Nuclear Science, Kyoto University (KURNS). Both measurements demonstrated that the single WSM is applicable for FETS-FFA ring if the diameter of CNT is smaller than the orbit separation in turns. In this paper, the detail of the design study of the single WSM as well as the performance tests are presented.  
poster icon Poster WEP019 [8.196 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP019  
About • Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 01 October 2023
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WEP031 Image Acquisition System for the Injection Dump at the Spallation Neutron Source controls, shielding, LabView, radiation 421
  • W. Blokland
    ORNL, Oak Ridge, Tennessee, USA
  • N.J. Evans, A.R. Oguz, W.D. Willis
    ORNL RAD, Oak Ridge, Tennessee, USA
  Funding: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE).
We describe the Image Acquisition system for the Injection Dump. This system visualizes the different beamlets, on the vacuum window after the H beam is stripped of its electrons by two stripper foils. One beamlet is from H with its electrons stripped by the first foil and the second beamlet has it final electron stripped by the second foil. We used the PXI platform to implement the data-acquisition including timing decoder. We describe the hardware and software for the system. We use a standard non-radhard GigE camera to acquire the image from the luminescent coating on the dump vacuum window. To lower the radiation damage to the camera, we shield it with stainless steel blocks. We present radiation measurements before and after shielding. We also show the radiation damage over time to estimate the camera’s lifetime.
poster icon Poster WEP031 [1.267 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP031  
About • Received ※ 06 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 27 September 2023
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