title: Line spectrum and ion temperature measurements from tungsten ions at low ionization stages in large helical device based on vacuum ultraviolet spectroscopy in wavelength range of 500-2200 Å.
abstract: Vacuum ultraviolet spectra of emissions released from tungsten ions at lower ionization stages were measured in the Large Helical Device (LHD) in the wavelength range of 500-2200 Å using a 3 m normal incidence spectrometer. Tungsten ions were distributed in the LHD plasma by injecting a pellet consisting of a small piece of tungsten metal and polyethylene tube. Many lines having different wavelengths from intrinsic impurity ions were observed just after the tungsten pellet injection. Doppler broadening of a tungsten candidate line was successfully measured and the ion temperature was obtained.
authors.affiliation: National Institute for Fusion Science, 322-6, Oroshi-cho, Toki 509-5292, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Oishi
authors.affiliation: National Institute for Fusion Science, 322-6, Oroshi-cho, Toki 509-5292, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Morita
authors.affiliation: Department of Fusion Science, Graduate University for Advanced Studies, 322-6, Oroshi-cho, Toki 509-5292, Japan.
authors.forename: X L
authors.initials: XL
authors.lastname: Huang
authors.affiliation: Department of Fusion Science, Graduate University for Advanced Studies, 322-6, Oroshi-cho, Toki 509-5292, Japan.
authors.forename: H M
authors.initials: HM
authors.lastname: Zhang
authors.affiliation: National Institute for Fusion Science, 322-6, Oroshi-cho, Toki 509-5292, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Goto