title: Development of a high current H(-) ion source for cyclotrons.
abstract: A multi-cusp DC H(-) ion source has been designed and fabricated for medical applications of cyclotrons. Optimization of the ion source is in progress, such as the improvement of the filament configuration, magnetic filter strength, extraction electrode's shape, configuration of electron suppression magnets, and plasma electrode material. A small quantity of Cs has been introduced into the ion source to enhance the negative ion beam current. The ion source produced 16 mA of DC H(-) ion beam with the Cs-seeded operation at a low arc discharge power of 2.8 kW.
authors.affiliation: Technology Research Center, Sumitomo Heavy Industries, Ltd., Yokosuka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Etoh
authors.affiliation: Technology Research Center, Sumitomo Heavy Industries, Ltd., Yokosuka, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Aoki
authors.affiliation: Technology Research Center, Sumitomo Heavy Industries, Ltd., Yokosuka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Mitsubori
authors.affiliation: Technology Research Center, Sumitomo Heavy Industries, Ltd., Yokosuka, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Arakawa
authors.affiliation: Industrial Equipment Division, Sumitomo Heavy Industries, Ltd., Niihama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Mitsumoto
authors.affiliation: Industrial Equipment Division, Sumitomo Heavy Industries, Ltd., Niihama, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yajima
authors.affiliation: Technology Research Center, Sumitomo Heavy Industries, Ltd., Yokosuka, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Sakuraba
authors.affiliation: Technology Research Center, Sumitomo Heavy Industries, Ltd., Yokosuka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kato
authors.affiliation: Fusion Research and Development Directorate, Japan Atomic Energy Agency, Aomori, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Okumura
mesh_terms: D002586:Cesium; D017357:Cyclotrons / Q000295:instrumentation*; D006859:Hydrogen; D059346:Magnets; D013696:Temperature
chemical_list: D002586:Cesium; D006859:Hydrogen