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Simultaneous evaluation of potential fluctuation from the core plasma to the end region in GAMMA 10

M. Yoshikawa, M. Sakamoto, Y. Miyata, M. Aoyama, M. Mizuguchi, M. Hirata, M. Ichimura, T. Imai, T. Kariya, I. Katanuma2013年被引用 9Nuclear FusionIF 3出版社

A correlation between drift-type fluctuations and anomalous radial transport was observed in GAMMA 10, and these fluctuations were suppressed by the electron-cyclotron-heating-driven radial electric field. We developed new diagnostics to conduct these studies: a simultaneous two-point-measurement gold neutral beam probe (GNBP) for the radial electric field and potential fluctuations, and a high-speed end-plate potential fluctuation measurement system. The electric field and its fluctuations were successfully obtained in a single plasma shot for the first time. Coherence between the drift-type potential fluctuations measured in the core plasma by the GNBP and those obtained by end-plate measurements was clearly observed. These potential and electric field fluctuations were clearly suppressed by the positive electric fields measured by two-point potential measurements using the GNBP and the end-plate system. We can obtain a powerful tool for probing the radial electric field and potential fluctuations in the core plasma because the end-plate potential fluctuation is the same as that in the core plasma measured using the new GNBP.

日本語訳

GAMMA 10において、ドリフト型揺動と異常径方向輸送との間の相関が観測され、これらの揺動は電子サイクロトロン加熱駆動の径方向電場によって抑制された。我々はこれらの研究を行うための新しい診断装置を開発した:径方向電場と電位揺動のための同時2点測定金中性粒子ビームプローブ(GNBP)、および高速端板電位揺動測定システムである。電場とその揺動は、単一のプラズマショットにおいて初めて成功裏に得られた。GNBPによってコアプラズマで測定されたドリフト型電位揺動と、端板測定によって得られたものとの間のコヒーレンスが明確に観測された。これらの電位および電場揺動は、GNBPと端板システムを用いた2点電位測定によって測定された正の電場によって明確に抑制された。端板電位揺動は、新しいGNBPを用いて測定されたコアプラズマ内のものと同じであるため、コアプラズマ内の径方向電場および電位揺動を調べるための強力なツールを得ることができる。

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