Development of a bellows duct with a semi-remote handling system at J-PARC Hadron Facility

A new proton beamline at 30 GeV, referred to as High-P beamline, has been constructed for nuclear-physics experiments at the J-PARC Hadron Facility. A first beam commissioning of the High-P beamline has been successfully carried out in May and June, 2020. The beam for the High-P beamline is branched using a Lambertson-type magnet from an existing primary-proton beamline. Since a portion of the primary beam is injected to a pole piece of the magnet, the branching point is expected to be fairly radioactive. To reduce radiation exposure for maintenance workers, a bellows duct with a semi-remote handling system for vacuum connections was newly developed. In this paper, a design of the bellows, and several examination results are reported. (author)