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Influence of externally applied magnetic perturbations on neoclassical tearing modes at ASDEX Upgrade

机译：在ASDEX升级时，外部施加的磁扰动对新古典撕裂模式的影响

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摘要

The influence of externally applied magnetic perturbations (MPs) on neoclassical tearing modes (NTM) and the plasma rotation in general is investigated at the ASDEX Upgrade tokamak (AUG). The low n resonant components of the applied field exert local torques and influence the stability of NTMs. The non-resonant components of the error field do not influence MHD modes directly but slow down the plasma rotation globally due to a neoclassical toroidal viscous torque (NTV). Both components slow down the plasma rotation, which in consequence increases the probability for the appearance of locked modes. To investigate the impact of externally applied MPs on already existing modes and the influence on the rotation profile, experimental observations are compared to modelling results. The model used here solves a coupled equation system that includes the Rutherford equation and the equation of motion, taking into account the resonant effects and the resistive wall. It is shown that the NTV torque can be neglected in this modelling. To match the experimental frequency evolution of the mode the MP field strength at the resonant surface has to be increased compared to the vacuum approximation. This leads to an overestimation of the stabilizing effect on the NTMs. The reconstruction of the entire rotation profile via the equation of motion including radial dependencies, confirms that the NTV is negligibly small and that small resonant torques at different resonant surfaces have the same effect as one large one. This modelling suggests that in the experiment resonant torques at different surfaces are acting and slowing down the plasma rotation requiring a smaller torque at the specific resonant surface of the NTM. This additionally removes the overestimated influence on the island stability, whereas the braking of the island's rotation is caused by the sum of all torques. Consequently, to describe the effect of MPs on the evolution of one island, all other islands and the corresponding torques must also be taken into account.
机译：在ASDEX升级托卡马克（AUG）上研究了外部施加的磁扰动（MPs）对新古典撕裂模式（NTM）和等离子体旋转的总体影响。外加磁场的低n谐振分量施加局部扭矩并影响NTM的稳定性。误差场的非谐振分量不会直接影响MHD模式，但会由于新古典环形超粘滞转矩（NTV）而整体上降低等离子体的旋转速度。这两个分量都会减慢等离子体的旋转速度，因此增加了出现锁定模式的可能性。为了研究外部施加的MP对现有模式的影响以及对旋转轮廓的影响，将实验观察结果与建模结果进行了比较。此处使用的模型解决了耦合方程组，其中考虑了共振效应和电阻壁，该耦合方程组包括卢瑟福方程和运动方程。结果表明，在该模型中可以忽略NTV转矩。为了匹配模式的实验频率演变，与真空近似相比，必须增加谐振表面的MP场强度。这导致对NTM的稳定效果的高估。通过运动方程式（包括径向相关性）对整个旋转曲线的重构，证实了NTV很小，可以忽略不计，并且在不同共振表面处的较小共振扭矩具有与一个较大共振扭矩相同的效果。该模型表明，在实验中，不同表面上的共振扭矩正在起作用并减慢了等离子体旋转的速度，从而需要在NTM的特定共振表面上使用较小的扭矩。此外，这消除了对孤岛稳定性的高估影响，而孤岛旋转的制动是由所有扭矩的总和引起的。因此，为了描述MP对一个孤岛演变的影响，还必须考虑所有其他孤岛和相应的扭矩。

著录项

  • 来源
    《Nuclear fusion》 |2015年第1期|013018.1-013018.13|共13页
  • 作者

    S. Fietz; A. Bergmann; I. Classen; M. Maraschek; M. Garcia-Munoz; W. Suttrop; H. Zohm;

  • 作者单位

    Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany;

    Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany;

    FOM Institute DIFFER-Dutch Institute for Fundamental Energy Research, Association EURATOM-FOM, Nieuwegein, The Netherlands;

    Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany;

    Faculty of Physics, FAMN Department, University of Seville, Seville, Spain;

    Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany;

    Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany;

  • 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

    neoclassical tearing mode; tokamak; magnetic perturbation field; ASDEX Upgrade; locked mode;

    机译：新古典的撕裂模式托卡马克磁扰动场ASDEX升级;锁定模式;

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