Design of injection and extraction at an 8-GeV booster ring and the J-PARC Main Ring for Multi-MW output beam power

Harada, Hiroyuki  ; Hotchi, Hideaki  ; Igarashi, Susumu*; Sato, Yoichi*; Koseki, Tadashi

The 240-kW output beam power in the J-PARC 50-GeV Main Ring (MR) has been achieved for the 30-GeV user operation with the cycle time of 2.48 sec and the injected beam intensity with the output beam power of 380-kW equivalent from 3-GeV Rapid Cycling Synchrotron (RCS). The target of output beam power in MR is 750-kW by faster cycling and the injected beam intensity of 600-kW equivalent beam from the RCS. The MR are developing the new type power supplies of the MR main magnets and the high-impedance core of the MR RF cavities. The RCS will aim the designed output beam power of 1-MW from the beam commissioning on October 2014 after the peak current upgrade of Linac from 30 to 50-mA. For higher beam power of MR, we have explored the accelerator options. As one of options, 8-GeV Booster Ring (BR) is also designed for increasing the injection energy of the MR. The increasement of injection energy leads to the reducing a space charge force and the increasing the acceptance clearance from the physical aperture of the MR. In this paper, the realistic injection and extraction system of the BR and the new injection system of the MR for Multi-MW output beam power are also described.