title: Extraction of negative hydrogen ions from a compact 14 GHz microwave ion source.
abstract: A pair of permanent magnets has formed enough intensity to realize electron cyclotron resonance condition for a 14 GHz microwave in a 2 cm diameter 9 cm long alumina discharge chamber. A three-electrode extraction system assembled in a magnetic shielding has formed a stable beam of negative hydrogen ions (H(-)) in a direction perpendicular to the magnetic field. The measured H(-) current density was about 1 mA∕cm(2) with only 50 W of discharge power, but the beam intensity had shown saturation against further increase in microwave power. The beam current decreased monotonically against increasing pressure.
authors.affiliation: Faculty of Life and Medical Sciences, Doshisha University, Kyoto 610-0321, Japan. mwada@mail.doshisha.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Wada
authors.forename: T
authors.initials: T
authors.lastname: Kasuya
authors.forename: T
authors.initials: T
authors.lastname: Kenmotsu
authors.forename: S
authors.initials: S
authors.lastname: Maeno
authors.forename: T
authors.initials: T
authors.lastname: Nishida
authors.forename: M
authors.initials: M
authors.lastname: Nishiura
authors.forename: K
authors.initials: K
authors.lastname: Shinto
authors.forename: H
authors.initials: H
authors.lastname: Yamaoka
mesh_terms: D004566:Electrodes; D006859:Hydrogen / Q000737:chemistry*; D008872:Microwaves; D011874:Radiometry / Q000295:instrumentation*
chemical_list: D006859:Hydrogen