Approaches to high power operation of J-PARC accelerator

J-PARC加速器の高出力化へのアプローチ

小栗 英知  

Oguri, Hidetomo

The J-PARC linac started beam operation with an energy of 181 MeV in 2006. To realize the nominal performance of 1 MW at a 3 GeV Rapid Cycling Synchrotron (RCS) and 0.75 MW at a Main Ring synchrotron (MR), the linac beam energy was increased to 400 MeV and the beam current was also increased from 30 to 50 mA. After the upgrade, the RCS demonstrated 1 MW equivalent beam operation and currently operates 500 kW for the Material and Life Science Facility. The MR beam power is increasing and becomes about 490 kW beam to the Neutrino Facility and about 51 kW at the Hadron Experimental. At present, we are considering two further upgrade plans increasing the RCS beam power to 1.5 MW and doubling the linac repetition rate to 50 Hz for a Transmutation Experimental Facility. To achieve 1.5 MW from the RCS, it is necessary to increase both the beam current and the pulse length about 20% at the linac.