Development and operation of a Cs-free J-PARC H ion source

Oguri, Hidetomo  ; Ueno, Akira  ; Namekawa, Yuya; Okoshi, Kiyonori ; Kondo, Yasuhiro   ; Ikegami, Kiyoshi*

A cesium-free negative hydrogen ion source driven with a LaB6 filament was developed for the J-PARC (Japan Proton Accelerator Research Complex). It is being operated for the J-PARC LINAC beam commissioning, which was started on 20 November 2006. Nine runs of 2-week beam commissioning will be done until the end of June 2007. The source is operated with a duty factor of 0.8 % (0.32 ms and 25 Hz) while providing a 5 mA beam typically. Each interval of the runs, optimizations, such as the filament position and so on, are examined. At present, a 39 mA beam is successfully extracted with a duty factor of 0.8 %.