Analysis on space charge effect mitigation using hybrid multipole magnet in J-PARC LINAC

Fuwa, Yasuhiro   ; Moriya, Katsuhiro  ; Takayanagi, Tomohiro   

In the high-intensity operation of the J-PARC Linac, it is necessary to suppress the beam loss caused by the emittance growth and the beam halo formation due to the space charge in the low-energy region. As a method to suppress the space charge effect, it has been proposed to cancel the effect of higher-order components of the space charge effect by using higher-order multipole fields such as octupole fields. In this presentation, we will report the characteristics of the multipole magnets fabricated for the MEBT1 of the J-PARC Linac and simulation results on the suppression of the space charge effect based on the magnetic field distribution generated by the fabricated magnet.