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首页> 外文期刊>Nuclear fusion >Observation of resonant and non-resonant magnetic braking in the n = 1 non- axisymmetric configurations on KSTAR
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Observation of resonant and non-resonant magnetic braking in the n = 1 non- axisymmetric configurations on KSTAR

机译：在KSTAR上以n = 1的非轴对称配置观察共振和非共振电磁制动

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摘要

Toroidal rotation braking by neoclassical toroidal viscosity driven by non-axisymmetric (3D) magnetic fields, called magnetic braking, has great potential to control rotation profile, and thereby modify tokamak stability and performance. In order to characterize magnetic braking in the various 3D field configurations, dedicated experiments have been carried out in KSTAR, applying a variety of static n — 1, 3D fields of different phasing of -90, 0, and +90. Resonant-type magnetic braking was achieved by —90 phasing fields, accompanied by strong density pump-out and confinement degradation, and explained by excitation of kink response captured by ideal plasma response calculation. Strong resonant plasma response was also observed under +90 phasing at q95 ~ 6, leading to severe confinement degradation and eventual disruption by locked modes. Such a strong resonant transport was substantially modified to non-resonant-type transport at higher q95 ~ 7.2, as the resonant particle transport was significantly reduced and the rotation braking was pushed to plasma edge. This is well explained by ideal perturbed equilibrium calculations indicating the strong kink coupling at lower q95 is reduced at higher q95 discharge. The 0 phasing fields achieved quiescent magnetic braking without density pump-out and confinement degradation, which is consistent with vacuum and ideal plasma response analysis predicting deeply penetrating 3D fields without an excitation of strong kink response.
机译：由非轴对称（3D）磁场驱动的新古典环形粘度驱动的环形旋转制动（称为电磁制动）具有控制旋转轮廓的巨大潜力，从而可以改变托卡马克的稳定性和性能。为了表征各种3D场配置中的电磁制动，已在KSTAR中进行了专门的实验，应用了-90、0和+90不同相位的各种静态n_1、3D场。共振型电磁制动是通过-90相场实现的，伴随着强烈的密度泵出和约束退化，并通过理想等离子体响应计算所捕获的扭结响应的激发来解释。在q95〜6的+90相位下，也观察到了强烈的共振等离子体响应，从而导致严重的限制降解并最终被锁定模式破坏。在较高的q95〜7.2下，由于共振粒子的传输显着降低并且旋转制动被推至等离子体边缘，因此这种强的共振传输已基本上被修改为非共振型传输。理想的扰动平衡计算可以很好地解释这一点，表明在较高的q95放电下，较低q95的强扭结耦合会降低。 0相场实现了静态电磁制动，而没有密度抽出和限制退化，这与真空和理想的等离子体响应分析相一致，该分析预测了深穿透的3D场而没有强烈的扭结响应。

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  • 来源
    《Nuclear fusion》 |2017年第12期|415-424|共10页
  • 作者

    Kimin Kim; W. Choe; Y. ln; W.H. Ko; M.J. Choi; J.G. Bak; H.S. Kim; Y.M. Jeon; J.G. Kwak; S.W. Yoon; Y.K. Oh; J.-K. Park;

  • 作者单位

    Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea,National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    National Fusion Research Institute, Daejeon 34133, Republic of Korea;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, 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 braking; plasma response; non-axisymmetric magnetic fields; KSTAR;

    机译：电磁制动血浆反应非轴对称磁场;科士达;

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