Plasma and Fusion Research

Volume 11, 2402095 (2016)

Regular Articles

Development of Electron Bernstein Emission Diagnostic for Heliotron J
Kazunobu NAGASAKI, Yuji NAKAMURA1), Sohei KAMIOKA1), Hiroe IGAMI2), Francesco VOLPE3), Torsten STANGE4), Kinzo SAKAMOTO, Hiroyuki OKADA, Takashi MINAMI, Shinichiro KADO, Shinji KOBAYASHI, Satoshi YAMAMOTO, Shinsuke OHSHIMA, Gavin WEIR, Shigeru KONOSHIMA, Naoki KENMOCHI1), Yoshiaki OTANI1), Yasuo YOSHIMURA2), Nikolai MARUSHCHENKO4) and Tohru MIZUUCHI
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
1)
Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan
2)
National Institute for Fusion Science, Toki 509-5292, Japan
3)
Applied Physics and Applied Mathematics, Columbia University, New York, USA
4)
Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, D-17491, Greifswald, Germany
(Received 25 November 2015 / Accepted 6 May 2016 / Published 30 June 2016)

Abstract

Electron Bernstein Emission (EBE) diagnostic system using Ordinary (O) - eXtraordinary (X) - Bernstein (B) mode conversion process has been developed for determining electron temperature profiles at overdense plasmas in a helical-axis heliotron device, Heliotron J. Ray-tracing calculation results show that the O-X mode conversion window is accessible with a current ECH/ECCD launcher and transmission system. The EBW radiation from the core region is expected to be measurable by adjusting the magnetic field strength. Effect of density fluctuation on O-X mode conversion efficiency is also discussed. Based on the calculations, a multi-channel radiometer of Ka-band range has been designed, assembled and tested.

Keywords

electron Bernstein emission, diagnostic, ray tracing, radiometer, Heliotron J

DOI: 10.1585/pfr.11.2402095

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