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首页> 外文期刊>Nuclear fusion >Feedforward and feedback control of locked mode phase and rotation in DIII-D with application to modulated ECCD experiments
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Feedforward and feedback control of locked mode phase and rotation in DIII-D with application to modulated ECCD experiments

机译：DIII-D中锁定模式相位和旋转的前馈和反馈控制及其在调制ECCD实验中的应用

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摘要

The toroidal phase and rotation of otherwise locked magnetic islands of toroidal mode number n = 1 are controlled in the DIII-D tokamak by means of applied magnetic perturbations of n = 1. Pre-emptive perturbations were applied in feedforward to 'catch' the mode as it slowed down and entrain it to the rotating field before complete locking, thus avoiding the associated major confinement degradation. Additionally, for the first time, the phase of the perturbation was optimized in real-time, in feedback with magnetic measurements, in order for the mode's phase to closely match a prescribed phase, as a function of time. Experimental results confirm the capability to hold the mode in a given fixed-phase or to rotate it at up to 20 Hz with good uniformity. The control-coil currents utilized in the experiments agree with the requirements estimated by an electromechanical model. Moreover, controlled rotation at 20 Hz was combined with electron cyclotron current drive (ECCD) modulated at the same frequency. This is simpler than regulating the ECCD modulation in feedback with spontaneous mode rotation, and enables repetitive, reproducible ECCD deposition at or near the island O-point, X-point and locations in between, for careful studies of how this affects the island stability. Current drive was found to be radially misaligned relative to the island, and resulting growth and shrinkage of islands matched expectations of the modified Rutherford equation for some discharges presented here. Finally, simulations predict the as designed ITER 3D coils can entrain a small island at sub-10 Hz frequencies.
机译：在DIII-D托卡马克中，通过施加n = 1的磁扰动来控制环形模式编号n = 1的否则已锁定的磁岛的环形相位和旋转。在前馈中应用先发性扰动以“捕获”该模式因为它放慢了速度，并在完全锁定之前将其夹带到旋转场中，因此避免了相关的主要限制条件退化。另外，第一次，在磁测量的反馈下，对扰动的相位进行了实时优化，以使该模式的相位与时间密切相关，与规定的相位匹配。实验结果证实了将模式保持在给定固定相位或以高达20 Hz的频率均匀旋转的能力。实验中使用的控制线圈电流与机电模型估算的要求一致。此外，将20 Hz的受控旋转与以相同频率调制的电子回旋电流驱动器（ECCD）相结合。这比通过自发模式旋转在反馈中调节ECCD调制更简单，并且可以在岛O点，X点及其之间的位置或附近进行重复，可复制的ECCD沉积，以便仔细研究这对岛稳定性的影响。发现当前驱动相对于该岛在径向上未对准，并且岛的增长和收缩与此处提出的某些放电的修正的卢瑟福方程式的期望相符。最后，仿真预测，按照设计的ITER 3D线圈可以在低于10 Hz的频率上夹带一个小岛。

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  • 来源
    《Nuclear fusion》 |2018年第3期|036022.1-036022.12|共12页
  • 作者

    W. Choi; R.J. La Haye; M.J. Lanctot; K.E.J.Olofsson; E.J.Strait; R. Sweeney; F.A. Volpe; The DIII-D Team;

  • 作者单位

    Columbia University, New York, NY 10027, United States of America;

    General Atomics, San Diego, CA 92121, United States of America;

    General Atomics, San Diego, CA 92121, United States of America;

    Columbia University, New York, NY 10027, United States of America;

    General Atomics, San Diego, CA 92121, United States of America;

    Columbia University, New York, NY 10027, United States of America;

    Columbia University, New York, NY 10027, United States of America;

    General Atomics, San Diego, CA 92121, United States of America;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic island; modulated ECCD; feedback control;

    机译：磁岛调制的ECCD;反馈控制;

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