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Effect of electrode biasing on m/n  =  2/1 tearing modes in J-TEXT experiments

Hai Liu, Qiming Hu, Zhipeng Chen, Q. Yu, Lizhi Zhu, Zhifeng Cheng, Ge Zhuang, Zhongyong Chen2017年被引用 16Nuclear FusionIF 3出版社

The effects of electrode biasing (EB) on the m/n  =  2/1 tearing mode have been experimentally studied in J-TEXT tokamak discharges, where m and n are the poloidal and toroidal mode numbers. It is found that for a negative bias voltage, the mode amplitude is reduced, and the mode frequency is increased accompanied by the increased toroidal plasma rotation speed in the counter-Ip direction. For a positive bias voltage, the mode frequency is decreased together with the change of the rotation velocity towards the co-Ip direction, and the mode amplitude is increased. Statistic results show that the variations in the toroidal rotation speed, the 2/1 mode frequency and its amplitude linearly depend on the bias voltage. The threshold voltages for complete suppression and locking of the mode are found. The experimental results suggest that applied electrode biasing is a possible method for the avoidance of mode locking and disruption.

日本語訳

J-TEXTトカマク放電において、電極バイアス(EB)がm/n = 2/1テアリングモードに及ぼす影響を実験的に研究した。ここで、mおよびnはそれぞれポロイダルモード数およびトロイダルモード数である。負のバイアス電圧の場合、モード振幅は減少し、モード周波数は増加し、それに伴ってトロイダルプラズマ回転速度も反Ip方向に増加することが見出された。正のバイアス電圧の場合、モード周波数は減少し、回転は共Ip方向へ変化し、モード振幅は増加した。統計的結果は、トロイダル回転速度、2/1モード周波数およびその振幅の変化がバイアス電圧に線形に依存することを示している。モードの完全な抑制およびロックのための閾値電圧が見出された。実験結果は、印加電極バイアスがモードロックおよびディスラプションの回避のための有効な手法である可能性を示唆している。

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