title: H- beam extraction from a cesium seeded field effect transistor based radio frequency negative hydrogen ion source.
abstract: H(-) beam was successfully extracted from a cesium seeded ion source operated using a field effect transistor inverter power supply as a radio frequency (RF) wave source. High density hydrogen plasma more than 10(19) m(-3) was obtained using an external type antenna with RF frequency of lower than 0.5 MHz. The source was isolated by an isolation transformer and H(-) ion beam was extracted from a single aperture. Acceleration current and extraction current increased with the increase of extraction voltage. Addition of a small amount of cesium vapor into the source enhanced the currents.
authors.affiliation: School of Engineering, Tohoku University, Sendai 980-8579, Japan. akira@ecei.tohoku.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Ando
authors.forename: T
authors.initials: T
authors.lastname: Matsuno
authors.forename: T
authors.initials: T
authors.lastname: Funaoi
authors.forename: N
authors.initials: N
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Tsumori
authors.forename: Y
authors.initials: Y
authors.lastname: Takeiri