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Extremely low intrinsic non-axisymmetric field in KSTAR and its implications

机译：KSTAR中极低的固有非轴对称场及其含义

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摘要

A surprisingly low level of intrinsic non-axisymmetric field (called 'error field') has been measured in KSTAR, suggesting at least an order of magnitude lower than in other major tokamaks. Specifically, the KSTAR was found to have an extremely low level of pitch resonant intrinsic error field at the m =2/1 surface in the order of 10~(-5) of the magnetic field at the geometric centre, instead of 10~(-4) typically observed in other devices. Using a single array of in-vessel control coils (IVCCs) at the outboard midplane, the n = 1 intrinsic error field was diagnosed. Such a low level of intrinsic non-axisymmetric field as measured in KSTAR is less than or comparable to the Earth's magnetic field or a remanent field in the KSTAR plasma chamber. Considering that a very low level of n = 1 intrinsic error field (mostly associated with kink-resonance) helps the plasma to be less vulnerable to mode-locking, this might have allowed the n = 1 resonant magnetic perturbation (RMP) currents (configured to be dominantly pitch-resonant for edge localized mode (ELM) suppression) to increase without invoking a kink-resonant mode-locking, consistent with experimental observation and poloidal mode spectra calculations in KSTAR. Further clarification of the influence of the intrinsic error field in terms of a 3D structure is expected to provide a solid foundation to understand the n = 1 RMP-driven ELM suppression uniquely observed in KSTAR.
机译：在KSTAR中已经测量到令人惊讶的低水平的固有非轴对称场（称为“误差场”），这表明至少比其他主要托卡马克要低一个数量级。具体而言，发现KSTAR在m / n = 2/1表面上具有极低的螺距共振固有误差场，约为几何中心磁场的10〜（-5）而不是10 〜（-4）通常在其他设备中观察到。使用舷外中平面的一个阵列的船内控制线圈（IVCC），诊断出n = 1的固有误差场。在KSTAR中测得的这种低水平的固有非轴对称场小于或可与KSTAR等离子室中的地球磁场或剩磁场相媲美。考虑到非常低的n = 1固有误差场水平（主要与扭结共振有关）有助于使等离子体不易受到锁模的影响，这可能允许n = 1共振磁扰动（RMP）电流（配置（主要是针对边沿局部模式（ELM）抑制的音调共振）增加，而无需调用扭结共振模式锁定，这与KSTAR中的实验观察和多态模式光谱计算相符。期望以3D结构的形式进一步阐明固有误差字段的影响，为理解在KSTAR中唯一观察到的n = 1 RMP驱动的ELM抑制提供坚实的基础。

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  • 来源
    《Nuclear fusion》 |2015年第4期|043004.1-043004.9|共9页
  • 作者

    Y. In; J.K. Park; J.M. Jeon; J. Kim; M. Okabayashi;

  • 作者单位

    National Fusion Research Institute, Daejeon, Korea;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543-0451, USA;

    National Fusion Research Institute, Daejeon, Korea;

    National Fusion Research Institute, Daejeon, Korea;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543-0451, USA;

  • 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

    intrinsic error field; mode-locking; non-axisymmetric field; tokamak; RMP ELM suppression;

    机译：固有误差字段;锁模非轴对称场托卡马克RMP ELM抑制;

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