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Resistive MHD modelling of the quasi-single helicity state in the KTX regimes

机译：KTX模式下准单螺旋状态的电阻MHD建模

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摘要

The potential formation of a quasi-single-helicity (QSH) state in the Keda Toms experiment (KTX) is investigated in resistive MHD simulations using the NIMROD code. We focus on the effects of finite resistivity on the mode structure and characteristics of the dominant linear and nonlinear resistive tearing-mode in a finite β, cylindrical configuration of a reversed field pinch model for KTX. In the typical resistive regimes of KTX where the Lundquist number S = 5 × 10~4, the plasma transitions to a steady QSH state after evolving through an initial transient phase with multiple helicities. The dominant mode of the QSH state develops from the dominant linear tearing mode instability. In the lower β regime, the QSH state is intermittent and short in duration; in the higherβ regime, the QSH state persists for a longer time and should be more easily observed in experiments.
机译：使用NIMROD代码在电阻MHD模拟中研究了Keda Toms实验（KTX）中准单螺旋（QSH）状态的电势形成。我们专注于有限电阻率对KTX反向场收缩模型的有限β圆柱配置中主导线性和非线性电阻撕裂模式的模式结构和特性的影响。在Lundquist数S = 5×10〜4的典型KTX电阻状态中，等离子体经过具有多个螺旋度的初始瞬变阶段后，转变为稳定的QSH状态。 QSH状态的主导模式是从主导线性撕裂模式不稳定性发展而来的。在较低的β态下，QSH状态是间歇性的，持续时间短。在较高的β态下，QSH状态持续时间更长，在实验中应更容易观察到。

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  • 来源
    《Nuclear fusion》 |2018年第1期|016049.1-016049.8|共8页
  • 作者

    Bing Luo; Ping Zhu; Hong Li; Wandong Liu;

  • 作者单位

    CAS Key Laboratory of Geospace Environment and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China,KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China;

    CAS Key Laboratory of Geospace Environment and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China,KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China,Department of Engineering Physics, University of Wisconsin-Madison, Madison, WI 53706, United States of America;

    KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China;

    KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, 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

    RFP; KTX; quasi-single helicity; MHD simulation; NIMROD;

    机译：RFP;KTX;准单螺旋MHD仿真;尼莫罗德;

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