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首页> 外文期刊>Plasma physics and controlled fusion >Observation of the m=1 mode during the ramp phase of the sawtooth oscillations in LHCD plasmas on the HT-7 tokamak
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Observation of the m=1 mode during the ramp phase of the sawtooth oscillations in LHCD plasmas on the HT-7 tokamak

机译：在HT-7托卡马克上LHCD等离子体的锯齿波振荡的斜坡阶段，观察到m = 1模式

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摘要

A new oscillation with m = 1 and n = 1, where m and n are the poloidal and toroidal mode numbers, respectively, has been observed with lower hybrid current drive (LHCD) on the HT-7 tokamak. This mode appears during the sawtooth ramp, saturates, damps and finally disappears before the subsequent sawtooth collapse and before the appearance of the precursor oscillations. The necessary condition for its observation is that the sawtooth period exceeds 6-7 ms and that the LHCD power exceeds the threshold value of about 90 kW. We propose that the mode may be destabilized by the current density gradient, the evolution of which is determined by the suprathermal electrons generated by the LHCD.
机译：在HT-7托卡马克上使用较低的混合电流驱动（LHCD）时，已经观察到m = 1和n = 1的新振荡，其中m和n分别是极谱模数和环形模数。该模式出现在锯齿形斜坡期间，并在随后的锯齿形塌陷之前和前体振荡出现之前饱和，衰减并最终消失。观察的必要条件是锯齿周期超过6-7 ms，LHCD功率超过大约90 kW的阈值。我们提出，该模式可能会因电流密度梯度而不稳定，电流密度梯度的演化取决于LHCD产生的超热电子。

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