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On current drive by Ohkawa mechanism of electron cyclotron wave in large inverse aspect ratio tokamaks

机译：大反长宽比托卡克斯电子回旋波的大川机制驱动电流的研究

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摘要

A localized and efficient current drive method in the outer-half region of the tokamak with a large inverse aspect ratio is proposed via the Ohkawa mechanism of electron cyclotron (EC) waves. Further off-axis Ohkawa current drive (OKCD) via EC waves was investigated in high electron beta β_e HL-2M-like tokamaks with a large inverse aspect ratio, and in EAST-like tokamaks with a low inverse aspect ratio. OKCD can be driven efficiently, and the driven current profile is spatially localized in the radial region, ranging from 0.62 to 0.85, where the large fraction of trapped electrons provides an excellent advantage for OKCD. Furthermore, the current drive efficiency increases with an increase in minor radius, and then drops when the minor radius beyond a certain value. The effect of trapped electrons greatly enhances the current driving capability of the OKCD mechanism. The highest current drive efficiency can reach 0.183 by adjusting the steering mirror to change the toroidal and poloidal incident angle, and the total driven current by OKCD can reach 20-32 kA MW~(-1) in HL-2M-like tokamaks. The current drive is less efficient for the EAST-like scenario due to the lower inverse aspect ratio. The results show that OKCD may be a valuable alternative current drive method in large inverse aspect ratio tokamaks, and the potential capabilities of OKCD can be used to suppress some important magnetohydrodynamics instabilities in the far off-axis region.
机译：通过电子回旋加速器（EC）波的大川机理，提出了一种具有高反长宽比的托卡马克外半部局部有效的电流驱动方法。在具有高反长宽比的高电子ββ_eHL-2M样托卡马克以及在具有低反长宽比的EAST样托卡马克中，研究了通过EC波进一步进行的离轴Ohkawa电流驱动（OKCD）。 OKCD可以被有效地驱动，并且被驱动的电流分布在空间上位于径向区域，范围从0.62到0.85，其中很大一部分被捕获的电子为OKCD提供了出色的优势。此外，电流驱动效率随着短半径的增加而增加，然后在短半径超过特定值时下降。捕获电子的作用大大增强了OKCD机制的电流驱动能力。通过调节转向镜改变环形和多角形入射角，最高电流驱动效率可以达到0.183，在类似HL-2M的托卡马克中，OKCD的总驱动电流可以达到20-32 kA MW〜（-1）。由于较低的反高宽比，对于类似EAST的方案，当前驱动器的效率较低。结果表明，OKCD在大的反长宽比托卡马克中可能是有价值的替代电流驱动方法，并且OKCD的潜在能力可用于抑制远轴外区域的一些重要的磁流体动力学不稳定性。

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  • 来源
    《Nuclear fusion》 |2018年第3期|036010.1-036010.11|共11页
  • 作者

    Pingwei Zheng; Xueyu Gong; Xingqiang Lu; Lihua He; Jingjia Cao; Qianhong Huang; Sheng Deng;

  • 作者单位

    School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, People's Republic of China;

    School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, People's Republic of China;

    School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, People's Republic of China;

    School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, People's Republic of China;

    School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, People's Republic of China;

    School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, People's Republic of China;

    School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, People's Republic of China;

  • 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

    current drive; Ohkawa mechanism; electron cyclotron wave; off-axis; MHD instabilities;

    机译：当前驱动器;大川机制电子回旋波离轴MHD不稳定性;

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