title: Development of an H- ion source for Japan Proton Accelerator Research Complex upgrade.
abstract: A cesium (Cs) free H(-) ion source driven with a lanthanum hexaboride (LaB(6)) filament was adopted as an ion source for the first stage of the Japan Proton Accelerator Research Complex (J-PARC). At present, the maximum H(-) ion current produced by the ion source is 38 mA, using which J-PARC can produce a proton beam power of 0.6 MW by accelerating it with the 181 MeV linac and the 3 GeV rapid cycling synchrotron. In order to satisfy the beam power of 1 MW required for the second stage of the J-PARC in the near future, we have to increase the ion current to more than 60 mA. Therefore, we have started to develop a Cs-seeded ion source by adding an external Cs-seeding system to a J-PARC test ion source that has a structure similar to that of the J-PARC ion source except for the fact that the plasma chamber is slightly larger. As a result, a H(-) ion current of more than 70 mA was obtained from the ion source using a tungsten filament instead of a LaB(6) filament with a low arc discharge power of 15 kW (100 V, 150 A).
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan. ohkoshi.kiyonori@jaea.go.jp
authors.forename: K
authors.initials: K
authors.lastname: Ohkoshi
authors.forename: Y
authors.initials: Y
authors.lastname: Namekawa
authors.forename: A
authors.initials: A
authors.lastname: Ueno
authors.forename: H
authors.initials: H
authors.lastname: Oguri
authors.forename: K
authors.initials: K
authors.lastname: Ikegami