Author: Shirakabe, Y.
Paper Title Page
WEPAB192 Simulation Study on Double Diffuser for Loss Reduction in Slow Extraction at J-PARC Main Ring 3069
 
  • R. Muto, Y. Arakaki, T. Kimura, S. Murasugi, K. Okamura, Y. Shirakabe, M. Tomizawa, E. Yanaoka
    KEK, Ibaraki, Japan
  • A. Matsumura
    Nihon Advanced Technology Co., Ltd, Ibaraki, Nakagun, Tokaimura, Japan
  
  J-PARC (Japan Pro­ton Ac­cel­er­a­tor Re­search Com­plex) Main Ring de­liv­ers slow-ex­tracted 30~GeV pro­ton beam to var­i­ous nu­clear and par­ti­cle physics ex­per­i­ments. In the slow ex­trac­tion the beam loss at the elec­tro­sta­tic sep­tum (ESS) is in­evitable, and the beam loss re­duc­tion is a key issue to re­al­ize the high-in­ten­sity beam de­liv­ery. We car­ried out sim­u­la­tion stud­ies on the ef­fec­tive­ness of the beam dif­fusers at the up­stream of the ESS for the beam loss re­duc­tion with var­i­ous ma­te­ri­als and di­men­sions of the dif­fusers. We found out that putting two dif­fusers si­mul­ta­ne­ously on the beam was ef­fec­tive for the beam loss re­duc­tion, and the ex­pected beam loss was 0.35 times as high as the op­er­a­tion with­out dif­fusers. Ac­cord­ing to the sim­u­la­tion re­sults we in­stalled the dif­fusers in the J-PARC Main Ring. We per­formed beam test with one dif­fuser and beam loss re­duc­tion of 60% was ob­served, which was in good agree­ment with the sim­u­la­tion re­sults.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB192  
About • paper received ※ 19 May 2021       paper accepted ※ 28 June 2021       issue date ※ 21 August 2021  
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