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Tangential SX Imaging for Visualization of Fluctuations in Toroidal Plasmas

Satoshi OHDACHI, Kazuo TOI, Gerhard FUCHS¹⁾ and the LHD experimental Group

National Institute for Fusion Science, 509-5292, Japan

1)

Institut fuer Plasmaphysik, Forschungszentrum Juelich, D-52425, Germany

(Received 20 December 2006 / Accepted 16 May 2007 / Published 20 November 2007)

Abstract

When the ratio of the plasma pressure to the magnetic pressure increases, Various kinds of instabilities evolve. Among them, magnetohydrodynamic instabilities, by which the plasma is deformed macroscopically, are in concern. Non-linear evolution of them is fairly complicated and two-dimensional structure of them is the key to understanding the phenomena. Tangentially viewing SX camera is promising diagnostics for 2D visualization, because most of the perturbations tend to have the equal phase along the field lines, the tangential view, which is almost parallel to the field lines, give a good opportunity to resolve the structure. Issues in this kind of camera are discussed. Improved system using multi-layer mirror is also described.

Copyright (c) 2007 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

imaging diagnostics, soft X-ray radiation, MHD instabilities, multi-layer mirror

DOI: 10.1585/pfr.2.S1016

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This paper may be cited as follows:

Satoshi OHDACHI, Kazuo TOI, Gerhard FUCHS and the LHD experimental Group, Plasma Fusion Res. 2, S1016 (2007).