title: Electron density profile measurements at a self-focusing ion beam with high current density and low energy extracted through concave electrodes.
abstract: The self-focusing phenomenon has been observed in a high current density and low energy ion beam. In order to study the mechanism of this phenomenon, a special designed double probe to measure the electron density and temperature is installed into the chamber where the high current density ion beam is injected. Electron density profile is successfully measured without the influence of the ion beam components. Estimated electron temperature and density are ∼0.9 eV and ∼8 × 10(8) cm(-3) at the center of ion beam cross section, respectively. It was found that a large amount of electrons are spontaneously accumulated in the ion beam line in the case of self-forcing state.
authors.affiliation: Department of Engineering Mechanics and Energy, University of Tsukuba, Ibaraki, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Fujiwara
authors.affiliation: Innovative Plasma Technologies Group, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hirano
authors.affiliation: Innovative Plasma Technologies Group, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kiyama
authors.affiliation: Department of Engineering Mechanics and Energy, University of Tsukuba, Ibaraki, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Nakamiya
authors.affiliation: Innovative Plasma Technologies Group, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Koguchi
authors.affiliation: Department of Engineering Mechanics and Energy, University of Tsukuba, Ibaraki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sakakita