Plasma and Fusion Research

Volume 8, 2402037 (2013)

Regular Articles

Imaging Bolometers for Visualization of Plasma Radiation and Cross-Validation of Three Dimensional Impurity Transport Models for the Large Helical Device

Byron J. PETERSON, Evgeny A. DRAPIKO¹⁾, Kiyofumi MUKAI, Masahiro KOBAYASHI, Shwetang N. PANDYA²⁾, Ryuichi SANO²⁾ and the LHD Experiment Group

: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
1): Kurchatov Institute, Moskow 123182, Russia
2): Graduate University for Advanced Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan

(Received 7 December 2012 / Accepted 8 March 2013 / Published 22 May 2013)

Abstract

The InfraRed imaging Video Bolometer (IRVB) measures the radiation from the plasma in two dimensions, giving an image of the plasma radiation power loss. Using a geometry matrix calculated from a model of the LHD first wall, the IRVB sightline geometry and a three dimensional (3D) plasma grid, a synthetic instrument is developed using the 3D carbon impurity radiation results of the EMC3-EIRENE edge impurity transport code as an input. The output of the synthetic instrument are images of the plasma radiation at the IRVB foil due to the EMC3-EIRENE code, which are qualitatively compared with preliminary experimental images from the IRVB. Such a comparison for detached discharges in LHD in which an externally induced m/n = 1/1 magnetic island is applied shows that when the magnetic island is moved 36 degrees toroidally the enhanced radiation in the x-points of the magnetic island also moves as predicted by the EMC3-EIRENE code.

Keywords

bolometer, imaging, plasma radiation, LHD, synthetic instrument

DOI: 10.1585/pfr.8.2402037

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References

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This paper may be cited as follows:

Byron J. PETERSON, Evgeny A. DRAPIKO, Kiyofumi MUKAI, Masahiro KOBAYASHI, Shwetang N. PANDYA, Ryuichi SANO and the LHD Experiment Group, Plasma Fusion Res. 8, 2402037 (2013).