Simulations of magnetic field effects on 3-GeV proton beam brought by magnets for muon beam in future proton beam transport line of J-PARC

A high-power 3-GeV proton beam from a rapid cycling synchrotron (RCS) is transported to targets for muon and neutron production at Materials and Life Science Experimental Facility (MLF) by a 3-GeV RCS to Neutron facility Beam Transport (3NBT) line in J-PARC. Recently, the design power of 1 MW has been achieved, which has initiated a future plan of MLF second target station (TS2). For the future plan, design studies have been started for a new beam transport line to the TS2 target, which works as a source for both muon and neutron. In this study, 3-GeV proton beam transport is simulated in the vicinity of the TS2 target, where a bending magnet for muon separation and a capture solenoid are aligned. In this presentation, we report magnetic field effects on the proton beam brought by those magnets and correction of the effects.