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Report No.

New injection scheme of J-PARC rapid cycling synchrotron

Yamamoto, Kazami  ; Kamiya, Junichiro  ; Saha, P. K.  ; Takayanagi, Tomohiro  ; Yoshimoto, Masahiro ; Hotchi, Hideaki ; Harada, Hiroyuki ; Takeda, Osamu*; Miki, Nobuharu*

The 3-GeV Rapid Cycling Synchrotron of Japan Proton Accelerator Research Complex aims to deliver 1-MW proton beam to the neutron target and Main Ring synchrotron. Present beam power of the Rapid Cycling Synchrotron is up to 500-kW and the higher radiation doses were concentrated in the injection area. These activations were caused by the interaction between the foil and the beam. To reduce the worker dose near the injection point, we have studied a new design of the injection scheme to secure enough space for radiation shielding and bellows. In the new system, two of four injection pulse bump magnets are replaced and we are able to ensure the additional space around the injection foil chamber. So far, new injection system seems not impossible. However, preliminary study result indicated that temperature of the duct and shielding metals would be slightly higher. The eddy current due to the shift bump magnet field generates heat. Thus we have to study details of above effect.



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