Upgrade of Beam Diagnostics in LEBT and MEBT of J-PARC LINAC

Front-end part (from an ion source, up to the first drift tube linac, DTL-1) of J-PARC LINAC [1] was transported to Tokai, after beam tests in Tsukuba [2]. From the coming December, commissioning with H beam in Tokai is scheduled. Before the commissioning, upgrade of beam diagnostics is taken; three beam current monitors (slow current transformer, SCT) and two beam phase monitors (fast current transformer, FCT) are added in the low-energy transport line (LEBT) and mediumenergy transport line (MEBT). The upgrade scheme of these additional monitors is described.