title: Electron density measurement of cesium seeded negative ion source by surface wave probe.
abstract: Electron density measurements of a large-scaled negative ion source were carried out with a surface wave probe. By comparison of the electron densities determined with the surface wave probe and a Langmuir probe, it was confirmed that the surface wave probe is highly available for diagnostic of the electron density in H(-) ion sources. In addition, it was found that the ratio of the electron density to the H(-) ion density dramatically decreases with increase of a bias voltage and the H(-) ions become dominant negative particles at the bias voltage of more than 6 V.
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan. kisaki.masashi@LHD.nifs.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Kisaki
authors.forename: K
authors.initials: K
authors.lastname: Tsumori
authors.forename: H
authors.initials: H
authors.lastname: Nakano
authors.forename: K
authors.initials: K
authors.lastname: Ikeda
authors.forename: M
authors.initials: M
authors.lastname: Osakabe
authors.forename: K
authors.initials: K
authors.lastname: Nagaoka
authors.forename: M
authors.initials: M
authors.lastname: Shibuya
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: H
authors.initials: H
authors.lastname: Sekiguchi
authors.forename: S
authors.initials: S
authors.lastname: Komada
authors.forename: T
authors.initials: T
authors.lastname: Kondo
authors.forename: H
authors.initials: H
authors.lastname: Hayashi
authors.forename: E
authors.initials: E
authors.lastname: Asano
authors.forename: Y
authors.initials: Y
authors.lastname: Takeiri
authors.forename: O
authors.initials: O
authors.lastname: Kaneko