Keyword: LEBT
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TUC1C2 The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator rfq, linac, MEBT, simulation 68
 
  • A.M. Hoover, A.V. Aleksandrov, S.M. Cousineau, K.J. Ruisard, A.P. Shishlo, A.P. Zhukov
    ORNL, Oak Ridge, TN, USA
 
  Hadron beams develop intensity-dependent transverse-longitudinal correlations within radio-frequency quadrupole (RFQ) accelerating structures. These correlations are only visible in six-dimensional phase space and are destroyed by reconstructions from low-dimensional projections. In this work, we estimate the effect of artificial decorrelation on the beam dynamics in the Spallation Neutron Source (SNS) linac and Beam Test Facility (BTF). We show that the evolution of a realistic initial distribution and its decorrelated twin converge during the early acceleration stages; thus, low-dimensional projections are probably sufficient for detailed predictions in high-power linacs.  
slides icon Slides TUC1C2 [6.573 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C2  
About • Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 13 October 2023
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TUA3I3 ESS Normal Conducting Linac Commissioning Results MMI, DTL, MEBT, linac 118
 
  • Y. Levinsen, M.E. Eshraqi, N. Milas, R. Miyamoto, D. Noll
    ESS, Lund, Sweden
 
  The European Spallation Source is designed to be the world’s brightest neutron source once in operation, driven by a 5 MW proton linac. The linac consists of a normal conducting front end followed by a superconducting linac. The normal conducting part has been commissioned in several stages, with the latest stage involving all but one DTL tank now in 2023. During this commissioning period, we successfully transported a 50 us pulse of the nominal 62.5 mA beam current. We will present an overview of the commissioning results, with a focus on what we achieved in this latest stage.  
slides icon Slides TUA3I3 [31.400 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA3I3  
About • Received ※ 04 October 2023 — Revised ※ 11 October 2023 — Accepted ※ 13 October 2023 — Issued ※ 15 October 2023
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THBP08 Simulation Studies on the Low Energy Beam Transfer (LEBT) System of the ISIS Neutron Spallation Source ion-source, rfq, solenoid, space-charge 454
 
  • S.A. Ahmadiannamin, D.C. Faircloth, S.R. Lawrie, A.P. Letchford, T.M. Sarmento, O.A. Tarvainen
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  The transmission efficiency and beam dynamic parameters of the low-energy beam transfer (LEBT) section of proton accelerators, serving as a neutron spallation source, have a critical impact on beam loss in subsequent sections of the linear accelerator. Due to variations and mismatches, the beam parameters at the entrance of the radio-frequency quadrupole (RFQ) change, significantly affecting the transmission efficiency of the RFQ and the matching between RFQ and drift tube linac (DTL) structures. Recognizing the importance of this concept, particle-in-cell studies were conducted to optimize the LEBT section of the ISIS accelerator. This study presents the results of simulations.  
poster icon Poster THBP08 [1.081 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP08  
About • Received ※ 01 October 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 30 October 2023
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FRA1I1 Status of the IOTA Proton Injector proton, rfq, electron, MEBT 629
 
  • D.R. Edstrom, D.R. Broemmelsiek, K. Carlson, J.-P. Carneiro, H. Piekarz, A.L. Romanov, A.V. Shemyakin, A. Valishev
    Fermilab, Batavia, Illinois, USA
 
  Funding: This work 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 IOTA Proton Injector (IPI), currently under installation at the Fermilab Accelerator Science and Technology facility, is a beamline capable of delivering 20-mA pulses of protons at 2.5 MeV to the Integrable Optics Test Accelerator (IOTA) ring. First beam in the IPI beamline is anticipated in 2023, when it will operate alongside the existing electron injector beamline to facilitate further fundamental physics research and continued development of novel accelerator technologies in the IOTA ring. This report details the expected operational profile, known challenges, and the current state of installation.
 
slides icon Slides FRA1I1 [6.466 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-FRA1I1  
About • Received ※ 08 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 11 October 2023
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FRC1I1 The Beam Destinations for the Commissioning of the ESS High Power Normal Conducting Linac DTL, proton, MMI, linac 643
 
  • E.M. Donegani, V. Grishin, E. Laface, C. Neto, A. Olsson, L. Page, T.J. Shea
    ESS, Lund, Sweden
  • V.V. Bertrand
    PANTECHNIK, Bayeux, France
  • I. Bustinduy
    ESS Bilbao, Zamudio, Spain
  • M. Ruelas
    RadiaBeam, Santa Monica, California, USA
 
  At the European Spallation Source (ESS) in Lund (Sweden), the commissioning of the high-power normal conducting linac started in 2018. This paper deals with the beam destinations for the commissioning phases with initially the proton source and LEBT, then the MEBT and lately four DTL sections. The beam destinations were designed to withstand the ESS commissioning beam modes (with proton current up to 62.5mA, pulse length up to 50E-6s and repetition rates up to 14Hz). The EPICS-based control system allows measurements of the proton current and pulse length in real-time; it controls the motion and the power suppliers, and it also monitors the water cooling systems. Special focus will be on the results of thermo-mechanical simulations in MCNP/ANSYS to ensure safe absorption and dissipation of the volumetric power-deposition. The devices’ materials were chosen not only to cope with the high-power proton-beam, but also to be vacuum-compatible, to minimize the activation of the beam destinations themselves and the residual dose nearby. The results of neutronics simulations will be summarized with special focus on the shielding strategy, the operational limits and relocation procedures.  
slides icon Slides FRC1I1 [6.348 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-FRC1I1  
About • Received ※ 29 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 13 October 2023
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