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Observation of Ion Cyclotron Emission Owing to DD Fusion Product H Ions in JT-60U

Shoichi SATO, Makoto ICHIMURA, Yuusuke YAMAGUCHI, Makoto KATANO, Yasutaka IMAI, Tatsuya MURAKAMI, Yuichiro MIYAKE, Takuro YOKOYAMA, Shinichi MORIYAMA¹⁾, Takayuki KOBAYASHI¹⁾, Atsushi KOJIMA¹⁾, Koji SHINOHARA¹⁾, Yoshiteru SAKAMOTO¹⁾, Tsuguhiro WATANABE²⁾, Hitoshi HOJO and Tsuyoshi IMAI

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

1)

Japan Atomic Energy Agency, Naka 311-0193, Japan

2)

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 8 December 2009 / Accepted 17 February 2010 / Published 10 December 2010)

Abstract

High-frequency fluctuations in the ion cyclotron range of frequency (ICRF) are excited in magnetically confined plasmas because of the distortion of velocity distribution. In deuterium plasma experiments in JT-60U, ion cyclotron emission (ICE) detected as magnetic fluctuations is observed using ICRF antennas as pickup loops. The toroidal wave-numbers can be estimated using the phase differences between the signals from antenna elements arrayed in the toroidal direction. In this manuscript, ICE due to fusion product (FP) H ions, ICE(H), which is identified separately from the second-harmonic ICE caused by D ions, is newly reported. ICE is considered to result from spontaneous excitation of magnetosonic waves associated with FP high-energy ions. ICE caused by ³He ions and T ions has already been identified and confirmed to have finite toroidal wave-numbers. In contrast, ICE caused by ions originating in neutral beam injection has no toroidal wave-numbers. It is suggested that the appearance of ICE(H) depends strongly on the plasma density, and weak magnetic shear operation is one of the possible conditions for the observation of ICE(H).

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

ion cyclotron emission, ICRF antenna, H ion, DD fusion, JT-60U

DOI: 10.1585/pfr.5.S2067

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References

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This paper may be cited as follows:

Shoichi SATO, Makoto ICHIMURA, Yuusuke YAMAGUCHI, Makoto KATANO, Yasutaka IMAI, Tatsuya MURAKAMI, Yuichiro MIYAKE, Takuro YOKOYAMA, Shinichi MORIYAMA, Takayuki KOBAYASHI, Atsushi KOJIMA, Koji SHINOHARA, Yoshiteru SAKAMOTO, Tsuguhiro WATANABE, Hitoshi HOJO and Tsuyoshi IMAI, Plasma Fusion Res. 5, S2067 (2010).