title: An innovative high-power constant-current pulsed-arc power-supply for a high-density pulsed-arc-plasma ion-source using a LaB6-filament.
abstract: An innovative high-power constant-current (CC) pulsed-arc (PA) power-supply (PS) indispensable for a high-density PA plasma ion-source using a lanthanum hexaboride (LaB(6)) filament was devised by combining a constant-voltage (CV) PA-PS, which is composed of an insulated gate bipolar transistor (IGBT) switch, a CV direct-current (dc) PS and a 270 mF capacitor with a CC-PA-PS, which is composed of an IGBT-switch, a CC-dc-PS and a 400 microH inductor, through the inductor. The hybrid-CC-PA-PS succeeded in producing a flat arc-pulse with a peak power of 56 kW (400 A x 140 V) and a duty factor of more than 1.5% (600 micros x 25 Hz) for Japan Proton Accelerator Research Complex (J-PARC) H(-) ion-source stably. It also succeeded in shortening the 99% rising-time of the arc-pulse-current to about 20 micros and tilting up or down the arc-pulse-current arbitrarily and almost linearly by changing the setting voltage of its CV-dc-PS.
authors.affiliation: J-PARC Center, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan. akira.ueno@j-parc.jp
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
authors.forename: Y
authors.initials: Y
authors.lastname: Namekawa
authors.forename: K
authors.initials: K
authors.lastname: Ohkoshi
authors.forename: A
authors.initials: A
authors.lastname: Tokuchi