BEAM BASED ALIGNMENT OF J-PARC LINAC

During the beam commissioning of J-PARC LINAC, a conventional method for the beam-based alignment is performed to find a relative alignment offset of a quadrupole magnet to a nearby beam-position monitor. It varies the field of a quadrupole magnet field and one of its upstream steering magnets, and measures the responses of downstream BPMs. The offset of magnetic center is extracted by analyzing the deviation of beam orbit. The measurement has been performed for singlet quadrupole magnets. Accuracy within a few 10 micrometers has been achieved. This paper describes a detail procedure and the measurement results.

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