Transverse Beam Matching and Orbit Corrections at J-PARC LINAC

In high intensity H beam of J-PARC LINAC, precise control of transverse beam dynamics is extremely important to suppress beam loss. Transverse matching has been performed at several matching sections in LINAC, which consist of knob quadruple magnets (QM’s) and wire scanners (WS’s) for profile measurements. Mismatch factors of less than 5% have been achieved. Matching of Twiss parameters and dispersion at the RCS injection point has been also done with quadruple magnets at L3BT injection region with beam profiles measured with WS’s and also multi-wire profile monitors (MWPM’s) at RCS. Orbit corrections along the whole LINAC have been done with steering dipole magnets in the upstream of beam position monitors (BPM’s). Orbit deviations were suppressed within 1mm in the whole LINAC.