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Suppression of the m/n=2/1 tearing mode by ECH/ECCD on JFT-2M Tokamak

K Hoshino, K Takahashi, JFT-2M Group2001年Fusion Engineering and DesignIF 1.7出版社

AbstractA nonlinearly saturated large amplitude tearing mode (m/n=2/1) can be stabilized by heating of the center of the magnetic island by ECH in the JFT-2M tokamak. The effectiveness of the island O-point heating was shown by the feedback injection of the pulsed ECH pulse. The tearing mode causes the mode locking and plasma distuption occurs. It is observed that the mode locking is avoided by the ECH. The main mechanism of the present suppression seems to be the resistivity reduction due to the heating by ECH and not by the driven current by ECCD. The result was obtained from the counter ECCD experiment using a variable angle mirror antenna.

日本語訳

非線形的に飽和した大振幅テアリングモード(m/n=2/1)は、JFT-2MトカマクにおいてECHによる磁気島中心部の加熱によって安定化され得る。島のO点加熱の有効性は、パルスECHのフィードバック入射によって示された。テアリングモードはモードロックを引き起こし、プラズマのディスラプションが発生する。モードロックがECHによって回避されることが観測された。本抑制の主なメカニズムは、ECCDによる駆動電流ではなく、ECHによる加熱に起因する抵抗率の低減であると思われる。この結果は、可変角度ミラーアンテナを用いたカウンターECCD実験から得られた。

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Electron cyclotron heatingTearing modeElectron cyclotron current driveJFT-2M
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