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H_2 optimal control techniques for resistive wall mode feedback in tokamaks

机译：托卡马克电阻墙模式反馈的H_2最优控制技术

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摘要

DIII-D experiments show that a new, advanced algorithm enables resistive wall mode (RWM) stability control in high performance discharges using external coils. DIII-D can excite strong, locked or nearly locked external kink modes whose rotation frequencies and growth rates are on the order of the magnetic flux diffusion time of the vacuum vessel wall. Experiments have shown that modern control techniques like linear quadratic Gaussian (LQG) control require less current than the proportional controller in use at DIII-D when using control coils external to DIII-D's vacuum vessel. Experiments were conducted to develop control of a rotating n - 1 perturbation using an LQG controller derived from VALEN and external coils. Feedback using this LQG algorithm outperformed a proportional gain only controller in these perturbation experiments over a range of frequencies. Results from high β_N experiments also show that advanced feedback techniques using external control coils may be as effective as internal control coil feedback using classical control techniques.
机译：DIII-D实验表明，新的先进算法可使用外部线圈在高性能放电中实现电阻壁模式（RWM）稳定性控制。 DIII-D可以激发强，锁定或几乎锁定的外部扭结模式，其旋转频率和增长率约为真空容器壁的磁通量扩散时间。实验表明，当使用DIII-D真空容器外部的控制线圈时，诸如线性二次高斯（LQG）控制之类的现代控制技术所需的电流要小于DIII-D所使用的比例控制器。进行实验以开发使用源自VALEN和外部线圈的LQG控制器控制旋转n-1扰动的方法。在这些扰动实验中，使用LQG算法的反馈在一定频率范围内的性能优于仅比例增益控制器。高β_N实验的结果还表明，使用外部控制线圈的高级反馈技术可能与使用传统控制技术的内部控制线圈反馈一样有效。

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  • 来源
    《Nuclear fusion》 |2018年第4期|046017.1-046017.16|共16页
  • 作者

    Mitchell Clement; Jeremy Hanson; Jim Bialek; Gerald Navratil;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093, United States of America,Department of Applied Physics and Math, Columbia University, New York, NY 10027, United States of America;

    Department of Applied Physics and Math, Columbia University, New York, NY 10027, United States of America;

    Department of Applied Physics and Math, Columbia University, New York, NY 10027, United States of America;

    Department of Applied Physics and Math, Columbia University, New York, NY 10027, 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

    resistive wall mode; optimal control; LQG control; Tokamak; advanced Tokamak; feedback control; plasma control;

    机译：电阻壁模式;最佳控制;LQG控制;托卡马克先进的托卡马克反馈控制;等离子控制;

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