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Calculation of Geometry Matrices for IRVBs for Application to 3D Tomography of Radiative Phenomena in LHD

Byron J. PETERSON, Masahiro KOBAYASHI, Ryuichi SANO¹⁾, Shwetang N. PANDYA²⁾ and the LHD Experiment Group

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

1)

Hokkaido University, Sapporo 060-0808, Japan

2)

The Graduate University for Advance Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan

(Received 9 December 2011 / Accepted 18 January 2012 / Published 26 July 2012)

Abstract

InfraRed imaging Video Bolometers (IRVBs) can provide hundreds of channels of bolometric data forming an image of the plasma radiation [B.J. Peterson, Rev. Sci. Instrum. 71, 3696 (2000)]. By calculating the geometry matrix (or response matrix) of the detector field of view (FoV) with respect to a predefined three dimensional (3D) plasma grid of plasma voxels these geometry matrices can be used for 3D tomography of the plasma radiation. This is done by assuming that the plasma reproduces itself every half field period. Then by combining the FOV of 3 IRVBs with different views of the plasma (top, tangential, semi-tangential), one large geometry matrix can be derived relating 1968 IRVB channels to 13,161 plasma voxels. Results indicate that FoVs should be modified or supplemented to view plasma voxels near the helical divertor xpoints of the diagonal cross-sections (5° < φ < 13° ) which are in the shadows of the helical coils.

Copyright (c) 2012 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

Infrared Imaging Video Bolometer, 3D tomography, LHD

DOI: 10.1585/pfr.7.2402041

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References

• [1] B.J. Peterson, Rev. Sci. Instrum. 71, 3696 (2000).
• [2] B.J. Peterson et al., Plasma Fusion Res. 5, S2095 (2010).
• [3] V.S. Voitsenya et al., Plasma Dev. Op. 13, 291 (2005).
• [4] Y. Feng et al., Contrib. Plasma Phys. 44, 57 (2004).
• [5] D. Reiter et al., Fusion Sci. Technol. 47, 172 (2005).

This paper may be cited as follows:

Byron J. PETERSON, Masahiro KOBAYASHI, Ryuichi SANO, Shwetang N. PANDYA and the LHD Experiment Group, Plasma Fusion Res. 7, 2402041 (2012).