Operation and development status of The J-PARC ion source

Yamazaki, Saishun

A cesium-free H ion source driven with a LaB filament is being operated at the Japan Proton Accelerator Research Complex (J-PARC) without any serious trouble since the restoration from the March 2011 earthquake. The beam current from the source is routinely restricted approximately 19 mA for the lifetime of the filament. To increase the beam power at the linac beam operation, the beam current from the source was increased to 22 mA. At this operation, the lifetime of the filament was estimated by the reduction in the filament current. According to the steep reduction in the filament current, the break of the filament was predicted. As a part of the beam current upgrade plan, the front end test stand consisting of the rf-driven H ion source developed for the J-PARC 2nd stage requirements and the RFQ is under preparation.