Operational experience with J-PARC injection and extraction systems

Saha, P. K.   ; J-PARC Team*

The Japan Proton Accelerator Complex (J-PARC) is now in a full operational stage and delivering relatively high power beam to all experimental facilities. There are two stages of injection and extraction schemes in the entire facility and each has very unique as well as common issues in terms of the design criteria so as to obtain a design beam power at each stage and finally to ensure a stable and fair operation keeping the beam loss to an acceptable limit. There has been a lot of understandings and achievements through systematic beam studies but operation with further high power beam, there remains few urgent issues to discuss. The foil scattering loss at the RCS (Rapid Cycling Synchrotron) injection area, slow rise time and heating problem with MR (Main Ring) fast extraction kicker for high power operation, low duty factor in MR slow extraction and finally a stable system to ensure less downtime can be mentioned.