Author: Shobuda, Y.
Paper Title Page
MOPS004 Mitigation of Beam Instability due to Space Charge Effects at 3 GeV RCS in J-PARC 595
 
  • Y. Shobuda, M. Yamamoto
    JAEA/J-PARC, Tokai-mura, Japan
  • Y.H. Chin
    KEK, Ibaraki, Japan
  • F. Tamura
    KEK/JAEA, Ibaraki-Ken, Japan
  
  In order to ac­com­plish high in­ten­si­ty pro­ton beams, it is im­por­tant to iden­ti­fy the impedance source in ac­cel­er­a­tors. At 3 GeV rapid cy­cling syn­chrotron (RCS) in Japan Pro­ton Re­search Com­plex (J-PARC), the kick­er impedance is the most dom­i­nant among such impedance sources. Beam in­sta­bil­i­ty can be ob­served by cor­rect­ing chro­matic­i­ty dur­ing the ac­cel­er­a­tion. Growth rate due to the beam in­sta­bil­i­ty can be re­duced by mak­ing peak cur­rent larg­er (bunch­ing fac­tor small­er). In other words, it is ex­per­i­men­tal­ly found that space charge ef­fects mit­i­gate the beam in­sta­bil­i­ty.