Keyword: neutron
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MOP033 1L Target Harp Diagnostic Display Tool target, operation, diagnostics, status 99
  • A.D. Walker, E.L. Kerstiens
    LANL, Los Alamos, New Mexico, USA
  The Los Alamos Neutron Science Center (LANSCE) completed upgrades to its 1L Target Facility, which included installing the new Mark IV target assembly. This added a third tungsten target located upstream of the other two targets. Prior to Mark IV, beam centering on target was achieved by using thermocouples mounted to the quadrants and center of the upper target coolant chamber. It is slightly offset from center of the old upper target and it shadows several of the thermocouples previously used to center beam on target. This required adjustments to the diagnostic tools utilized to monitor position of the H beam that is being delivered to the 1L target. The original display included the thermocouple readouts and displayed a visual beam profile and position taken from an upstream harp. With some of the thermocouples now being shadowed, an image overlay was added to show where the harp¿s measured beam position is relative to both the upper and middle targets. This gives the beam operations team an additional level of awareness when it comes to thermocouple temperatures, beam steering, and beam tuning. Details of the display tool and its associated upgrades are presented.
LANL Report #: LA-UR-23-25004
poster icon Poster MOP033 [0.825 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP033  
About • Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 20 September 2023
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TU1I02 Beam Instrumentation Performance During Commissioning of the ESS Normal Conducting LINAC DTL, linac, MMI, MEBT 136
  • I.D. Kittelmann, R.A. Baron, E.C. Bergman, E.M. Donegani, V. Grishin, H. Hassanzadegan, H. Kocevar, N. Milas, R. Miyamoto, M. Mohammednezhad, F. Nilen, D. Noll, K.E. Rosengren, T.J. Shea, R. Tarkeshian, C.A. Thomas
    ESS, Lund, Sweden
  Once constructed, the European Spallation Source (ESS) will be a 5MW pulsed neutron source based on a 2 GeV proton linac delivering 2.86 ms long pulses at a 14 Hz repetition rate. This paper focuses on the beam instrumentation performance during the recent linac beam commissioning up to drift tube linac (DTL) tank 4 with 74 MeV output energy. Instrumentation and measurement results will be presented for beam parameters such as current, position, energy, emittance and beam loss.
Proposal by Peter, same proposal as ID 1283 by Wim. Alternative speaker Cyrille Thomas (ESS).
slides icon Slides TU1I02 [6.143 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU1I02  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 01 October 2023
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TUP004 Detector Response Studies of the ESS Ionization Chamber detector, linac, simulation, target 183
  • I. Dolenc Kittelmann, V. Grishin
    ESS, Lund, Sweden
  • P. Boutachkov
    GSI, Darmstadt, Germany
  • E. Effinger, A.T. Lernevall, W. Viganò, C. Zamantzas
    CERN, Meyrin, Switzerland
  The European Spallation Source (ESS), currently under construction in Lund, Sweden, will be a pulsed neutron source based on a proton linac. The ESS linac is designed to deliver a 2GeV beam with peak current of 62.5mA at 14 Hz to a rotating tungsten target for neutron production. One of the most critical elements for protection of an accelerator is a Beam Loss Monitoring (BLM) system. The system is designed to protect the accelerator from beam-induced damage and unnecessary activation of the components. The main ESS BLM system is based on ionization chamber (IC) detectors. The detector was originally designed for the LHC at CERN resulting in production of 4250 monitors in 2006-2008. In 2014-2017 a new production of 830 detectors with a modified design was carried out to replenish spares for LHC and make a new series for ESS and GSI. This contribution focuses on the results from a measurement campaigns performed at the HRM (High-Radiation to Materials) facility at CERN, where detector response of the ESS type IC has been studied. The results may be of interest for other facilities, that are using existing or plan to use new generation of LHC type IC monitors as BLM detectors.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP004  
About • Received ※ 04 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 16 September 2023 — Issue date ※ 21 September 2023
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TUP014 Design and Test of a Prototype 324 MHz RF Deflector in the Bunch Shape Monitor for CSNS-II Linac Upgrade linac, electron, cavity, proton 219
  • W.L. Huang, X.J. Nie
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • M.Y. Liu, X.Y. Liu, Y.F. Sui
    IHEP, Beijing, People’s Republic of China
  • Q.R. Liu
    UCAS, Beijing, People’s Republic of China
  Funding: Natural Science Foundation of Guangdong Province, 2021A1515010269 National Natural Science Foundation, 11475204
During the upgrade of linac in CSNS-II, the beam in-jection energy will increase from 80.1MeV to 300MeV and the beam power from 100kW to 500kW. A com-bined layout of superconducting spoke cavities and ellip-tical cavities is adopted to accelerate H beam to 300MeV. Due to a ~10ps short bunch width at the exit of the spoke SC section, the longitudinal beam density dis-tribution will be measured by bunch shape monitors using low energy secondary emission electrons. As the most important part of a bunch shape monitor, a prototype 324MHz RF deflector is designed and tuned on the basis of a quasi-symmetric λ/2 325MHz coaxial resona-tor, which was fabricated for the C-ADS proton accelera-tor project. Preliminary parameters of the bunch shape monitor are presented. Simulation of the RF deflector and test results in the laboratory are described and analysed.
poster icon Poster TUP014 [0.648 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP014  
About • Received ※ 30 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
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WEP030 First Results for a 50 MeV Beam Induced Fluorescence Monitor for Beam Profile Measurements experiment, vacuum, diagnostics, operation 418
  • G.B. Rosenthal, J.I. Anderson, A. Cao, E. Cramer, T. Gordon, K. Kuhn, O.O. Ledezma Vazquez, J. Lopez, S. Lynam, J.B. Ringuette, L. Szeto, J. Zhou
    Nusano, Valencia, CA, USA
  • E.F. Dorman, R.C. Emery, B. Smith
    University of Washington Medical Center, Seattle, Washington, USA
  Nusano is developing a 50 MeV alpha (4He++) particle accelerator*, primarily to produce medical radionuclides. The accelerator produces an average current of 3 mAe with 20 mAe average macro pulse current. This results in an average beam power of 75 kW, and an average beam power within the macro pulse of 500 kW. The beam profile at the exit of the DTL is approximately gaussian with a diameter (FWHM) of about 3 mm. Designing diagnostics for this beam is challenging, as any diagnostics that intercept beam will receive a very high heat load. A BIFM (Beam Induced Fluorescence Monitor) is being developed to measure beam profiles. Nitrogen gas is leaked into the beamline. Excitation of the nitrogen by beam particles is captured using an image intensifier. The signal generated is directly proportional to the beam current. A prototype system has been constructed and tested on a lower intensity alpha beam. First results indicate we can measure beam profile to a 100 µm accuracy. Production system is currently being designed.
* The Nusano accelerator can also accelerate 2H+, 3He++, 6Li3+, 7Li3+, and a few other heavier ions.
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP030  
About • Received ※ 05 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 01 October 2023
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