[Table of Contents]

Plasma and Fusion Research

Volume 10, 3402031 (2015)

Regular Articles


Line Spectrum of Tungsten Ions at Low Ionization Stages in Large Helical Device in Wavelength Range of 300 - 2400 Å Measured Using 20 cm Normal Incidence VUV Spectrometers
Tetsutarou OISHI1,2), Shigeru MORITA1,2), Xianli HUANG2), Hongming ZHANG2), Motoshi GOTO1,2) and the LHD Experiment Group1)
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
Department of Fusion Science, Graduate University for Advanced Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 26 November 2014 / Accepted 22 February 2015 / Published 16 April 2015)

Abstract

Vacuum ultraviolet (VUV) spectra of emissions released from tungsten ions at lower ionization stages were measured in the Large Helical Device (LHD) using three 20 cm normal incidence spectrometers in the wavelength range of 300 to 2400 Å. Tungsten ions were introduced in the LHD plasma by injecting a pellet consisting of a small piece of tungsten metal and polyethylene tube. The VUV spectroscopy revealed that WVI 639.683 Å, 677.722 Å, and 639.683 × 2 Å lines were useful lines for monitoring tungsten ion behaviors because they had large intensities and were isolated from other intrinsic impurity lines.


Keywords

vacuum ultraviolet, plasma spectroscopy, magnetically confined fusion, impurity transport, tungsten

DOI: 10.1585/pfr.10.3402031


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This paper may be cited as follows:

Tetsutarou OISHI, Shigeru MORITA, Xianli HUANG, Hongming ZHANG, Motoshi GOTO and the LHD Experiment Group, Plasma Fusion Res. 10, 3402031 (2015).