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Measurement of Impurity Emission Intensity Distribution in the Edge Region of LHD and Its Relation with Magnetic Field Structure

Taisuke KOBAYASHI¹⁾, Masahiro KOBAYASHI^1,2), Arseniy KUZMIN²⁾, Motoshi GOTO^1,2), Hirohiko TANAKA³⁾, Gakushi KAWAMURA^1,2), Byron J. PETERSON²⁾, Naofumi IWAMA²⁾ and LHD Experiment Group²⁾

1)

SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan

2)

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

3)

Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

(Received 28 December 2017 / Accepted 16 March 2018 / Published 24 April 2018)

Abstract

In order to understand plasma transport in the edge stochastic layers, a visible spectrometer has been developed. Two-dimensional impurity emission intensity distributions in the edge stochastic layer of LHD, including divertor plate, divertor legs, X-point, and the last closed flux surface, have been measured. Carbon emission intensities and their distributions are found to be clearly different depending on the different magnetic field configuration and on the charge state. Effects of the edge magnetic field structure on these results are discussed.

Copyright (c) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

impurity emission, stochastic magnetic field, spectroscopy, divertor, two-dimensional measurement

DOI: 10.1585/pfr.13.3402030

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References

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