title: Development and operation of a Cs-free J-PARC H(-) ion source.
abstract: A cesium-free H(-) ion source driven with a LaB(6) filament was developed for the J-PARC. It was operated for the J-PARC linac beam commissioning, which was started on 20 November 2006. Eight runs of 2 or 3 week beam commissioning were done until the end of June 2007. The source was mainly operated with a duty factor of 0.8% (320 micros and 25 Hz) while providing a 5 mA beam typically. Each interval of the runs, precise optimizations, such as the filament position, and so on, are examined. At present, a H(-) beam with a current of 38 mA and a rms normalized emittance of 0.22 pi mm mrad is extracted with a duty factor of 0.8% (320 micros and 25 Hz).
authors.affiliation: Japan Atomic Energy Agency (JAEA), Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan. oguri.hidetomo@jaea.go.jp
authors.forename: H
authors.initials: H
authors.lastname: Oguri
authors.forename: A
authors.initials: A
authors.lastname: Ueno
authors.forename: Y
authors.initials: Y
authors.lastname: Namekawa
authors.forename: K
authors.initials: K
authors.lastname: Ohkoshi
authors.forename: Y
authors.initials: Y
authors.lastname: Kondo
authors.forename: K
authors.initials: K
authors.lastname: Ikegami