title: Hydrogen negative ion production in a 14 GHz electron cyclotron resonance compact ion source with a cone-shaped magnetic filter.
abstract: The plasma electrode structure of a 14 GHz ECR ion source was modified to enlarge the plasma volume of low electron temperature region. The result shows that the extracted beam current reached about 0.6 mA/cm(2) with about 40 W microwave power. To investigate the correlation between the volume of the low electron temperature region and the H(-) current, a vacuum ultraviolet (VUV) spectrometer had been installed to observe light emission in the VUV wavelength range from the plasma. From the results of the negative ion beam current and that from VUV spectrometry, production rate of vibrationally excited hydrogen molecule seems to be enhanced by increasing the volume of low electron temperature region.
authors.affiliation: Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ichikawa
authors.affiliation: Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kasuya
authors.affiliation: School of Biomedical Sciences, Doshisha University, Kyotanabe, Kyoto, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kenmotsu
authors.affiliation: Novelion Systems Co. Ltd., Kyotanabe, Kyoto, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Maeno
authors.affiliation: National Institute for Fusion Science, Toki, Gifu, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nishiura
authors.affiliation: National Institute for Fusion Science, Toki, Gifu, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shimozuma
authors.affiliation: RIKEN SPring-8 Center, Sayo, Hyogo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamaoka
authors.affiliation: Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Wada
mesh_terms: D017357:Cyclotrons / Q000295:instrumentation*; D004566:Electrodes; D004583:Electrons; D006859:Hydrogen / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014618:Vacuum
chemical_list: D006859:Hydrogen