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Development of High Power ECH Systems for High and ELM-like Heat Flux in GAMMA 10 Tandem Mirror

Ryutaro MINAMI, Tsuyoshi IMAI, Tsuyoshi KARIYA, Tomoharu NUMAKURA, Hidetaka NAKABAYASHI, Taku EGUCHI, Ryo KAWARASAKI, Kazuhiro NAKAZAWA, Yoichi ENDO, Mafumi HIRATA, Makoto ICHIMURA, Ryuya IKEZOE, Isao KATANUMA, Junko KOHAGURA, Yousuke NAKASHIMA, Kensuke OKI, Mizuki SAKAMOTO, Masayuki YOSHIKAWA and GAMMA 10 Group

Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

(Received 19 November 2012 / Accepted 23 April 2013 / Published 19 June 2013)

Abstract

Development of high power gyrotrons and electron cyclotron heating (ECH) systems for the power modulation experiments in GAMMA 10 have been started in order to generate and control the high heat flux and to make the ELM (edge localized mode) like intermittent heat load pattern for divertor simulation studies. ECH for potential formation at the plug region (P-ECH) produces the electron flow with high energy along the magnetic filed line. From the power scaling of confining potential and electron flux in GAMMA 10, the higher ECH power generates the higher confinement potential and the higher electron flux. The peak heat-flux of more than 10 MW/m² has been obtained during the ECH injection within the available power of ECH. This value almost corresponds to the steady-state heat load of the divertor plate of ITER. However, we need substantial upgrade of the heating power to approach the ITER level ELM energy density. For this purpose, MW power gyrotrons at 28 GHz have been started and the development is undergoing efficiently in the ECH system upgrade program with the collaboration of Japan Atomic Energy Agency (JAEA).

Copyright (c) 2013 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

ECH power modulation, high heat flux, ELM, gyrotron, GAMMA 10 tandem mirror

DOI: 10.1585/pfr.8.2402081

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References

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This paper may be cited as follows:

Ryutaro MINAMI, Tsuyoshi IMAI, Tsuyoshi KARIYA, Tomoharu NUMAKURA, Hidetaka NAKABAYASHI, Taku EGUCHI, Ryo KAWARASAKI, Kazuhiro NAKAZAWA, Yoichi ENDO, Mafumi HIRATA, Makoto ICHIMURA, Ryuya IKEZOE, Isao KATANUMA, Junko KOHAGURA, Yousuke NAKASHIMA, Kensuke OKI, Mizuki SAKAMOTO, Masayuki YOSHIKAWA and GAMMA 10 Group, Plasma Fusion Res. 8, 2402081 (2013).