Author: Ishii, K.
Paper Title Page
THPS035 Collimator Upgrade Plan of the J-PARC Main Ring 3496
 
  • M.J. Shirakata, K. Ishii, C. Kubota, T. Oogoe, J. Takano
    KEK, Ibaraki, Japan
  • Y. Kuniyasu
    MELCO SC, Tsukuba, Japan
  • Y. Takiyama
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  
  A halo col­li­ma­tion sys­tem is pre­pared in the mid­dle of in­jec­tion-straight sec­tion in order to lo­cal­ize the beam loss oc­curred in main ring. It con­sists of three col­li­ma­tor units. The first unit scat­ters halo com­po­nents, and the other two units work as halo catch­ers. The per­mit­ted amount of beam loss­es in the col­li­ma­tor sec­tion is de­signed to be 450 W at the pre­sent. The up­grade plan of halo col­li­ma­tion sys­tem is run­ning in order to achieve about ten times larg­er beam loss ca­pa­bil­i­ty for high-pow­er beam op­er­a­tion. The col­li­ma­tor up­grade is planned by in­stalling a new col­li­ma­tor set and ra­di­a­tion shields which cover the col­li­ma­tor sec­tion. New col­li­ma­tor units are de­signed to be able to line-out the jaw with a part of ra­di­a­tion shield in­clud­ing the me­chan­i­cal de­vices. The de­sign work of col­li­ma­tor units and ra­di­a­tion shields is pre­sent­ed in this re­port.