title: Electron energy distribution function by using probe method in electron cyclotron resonance multicharged ion source.
abstract: We are constructing a tandem type electron cyclotron resonance (ECR) ion source (ECRIS). High-energy electrons in ECRIS plasma affect electron energy distribution and generate multicharged ion. In this study, we measure electron energy distribution function (EEDF) of low energy region (≦100 eV) in ECRIS plasma at extremely low pressures (10(-3)-10(-5) Pa) by using cylindrical Langmuir probe. From the result, it is found that the EEDF correlates with the electron density and the temperature from the conventional probe analysis. In addition, we confirm that the tail of EEDF spreads to high energy region as the pressure rises and that there are electrons with high energy in ECR multicharged ion source plasma. The effective temperature estimated from the experimentally obtained EEDF is larger than the electron temperature obtained from the conventional method.
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Sho
authors.initials: S
authors.lastname: Kumakura
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kurisu
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Daiju
authors.initials: D
authors.lastname: Kimura
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Yano
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Youta
authors.initials: Y
authors.lastname: Imai
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Fuminobu
authors.initials: F
authors.lastname: Sato
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Yushi
authors.initials: Y
authors.lastname: Kato
authors.affiliation: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Iida
mesh_terms: D017357:Cyclotrons; D004583:Electrons; D011312:Pressure