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Tearing mode stabilization by electron cyclotron resonant heating in EAST tokamak experiments

Y. Zhang, X.J. Wang, X.D. Zhang, H.D. Xu, S. Gu, T.F. Zhou, T.H. Shi, H.Q. Liu, X.J. Wang, H.H. Wang2021年被引用 4Nuclear FusionIF 3出版社

Tearing mode stabilization by electron cyclotron waves (ECWs) has been carried out in Experimental advanced superconductiong tokamak (EAST) experiments. The effects of the amount of ECW power and the radial wave deposition location on stabilizing the m/n = 2/1 magnetic island are investigated, where m/n is the poloidal/toroidal mode number. The local heating is found to dominate the mode stabilization in these experiments. The stabilization is more effective when the wave is deposited closer to the radial island location, as expected. With increasing ECW power, however, the tearing modes are not stabilized completely, and the island width saturates at a finite width. Moreover, the island rotation frequency is found to decrease when the ECW deposition is close to the island such that the island width is reduced significantly. Using externally applied, rotating resonant magnetic perturbations to generate slowly rotating magnetic islands, the locked island stabilization by ECW has also been studied, and the island width reduction and nonuniform island rotation are observed when the island's center passes through the ECW deposition region.

日本語訳

EAST(Experimental Advanced Superconducting Tokamak)実験において、電子サイクロトロン波(ECW)によるテアリングモードの安定化が実施された。ECWパワーの大きさと径方向の波動堆積位置がm/n=2/1磁気島の安定化に及ぼす影響が調査された。ここで、m/nはポロイダル/トロイダルモード数を表す。局所加熱がこれらの実験におけるモード安定化を支配することが見出された。波動が径方向の島位置に近いほど堆積する場合、安定化はより効果的であることが期待どおりに示された。しかしながら、ECWパワーを増加させても、テアリングモードは完全には安定化されず、島幅は有限の値で飽和した。さらに、ECW堆積が島に近い場合、島の回転周波数が減少し、島幅が有意に低減されることが観測された。外部から印加された回転共鳴磁気摂動を用いてゆっくり回転する磁気島を生成し、ECWによるロックド島の安定化も研究された。島の中心がECW堆積領域を通過する際に、島幅の低減と非一様な島回転が観測された。

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