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Effect of electron cyclotron beam width to neoclassical tearing mode stabilization by minimum seeking control in ITER

机译：电子回旋加速器束宽对ITER中最小搜寻控制对新古典撕裂模式稳定的影响

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摘要

We report the effect of the electron cyclotron (EC) beam width on the full suppression time of neoclassical tearing mode (NTM) using the finite difference method (FDM) based minimum seeking controller in ITER. An integrated numerical system is setup for time-dependent simulations of the NTM evolution in ITER by solving the modified Rutherford equation together with the plasma equilibrium, transport, and EC heating and current drive. The calculated magnetic island width and growth rate is converted to the Mirnov diagnostic signal as an input to the controller to mimic the real experiment. In addition, 10% of the noise is enforced to this diagnostic signal to evaluate the robustness of the controller. To test the dependency of the NTM stabilization time on the EC beam width, the EC beam width scan is performed for a perfectly aligned case first, then for cases with the feedback control using the minimum seeking controller. When the EC beam is perfectly aligned, the narrower the EC beam width, the smaller the NTM stabilization time is observed. As the beam width increases, the required EC power increases exponentially. On the other hand, when the minimum seeking controller is applied, NTM stabilization sometimes fails as the EC beam width decreases. This is consistently observed in the simulation with various representations of the noise as well as without the noise in the Mirnov signal. The higher relative misalignment, misalignment divided by the beam width, is found to be the reason for the failure with the narrower beam widths. The EC stabilization effect can be lower for the narrower beam widths than the broader ones even at the same misalignment due to the smaller ECCD at the island O-point. On the other hand, if the EC beam is too wide, the NTM stabilization time takes too long. Accordingly, the optimal EC beam width range is revealed to exist in the feedback stabilization of NTM.
机译：我们在ITER中使用基于有限差分法（FDM）的最小搜寻控制器报告了电子回旋加速器（EC）束宽度对新古典撕裂模式（NTM）的完全抑制时间的影响。通过求解修正的Rutherford方程以及等离子平衡，输运以及EC加热和电流驱动，为ITER中NTM演化的时变模拟建立了集成的数值系统。计算出的磁岛宽度和增长率将转换为Mirnov诊断信号，作为对控制器的输入，以模拟实际实验。此外，此诊断信号会产生10％的噪声，以评估控制器的鲁棒性。为了测试NTM稳定时间对EC束宽度的依赖性，首先对完全对齐的情况进行EC束宽度扫描，然后对使用最小搜寻控制器进行反馈控制的情况进行EC束宽度扫描。当EC光束完全对准时，EC光束宽度越窄，观察到的NTM稳定时间越短。随着光束宽度的增加，所需的EC功率成倍增加。另一方面，当应用最小搜寻控制器时，由于EC波束宽度减小，NTM稳定有时会失败。在仿真中始终可以观察到这一点，其中包含噪声的各种表示形式以及Mirnov信号中没有噪声的形式。发现较高的相对未对准，即未对准除以束宽度，是造成束宽度较窄的原因。即使在相同的未对准情况下，由于孤岛O点的ECCD较小，因此，对于较窄的光束宽度，EC稳定效果可能会比较宽的光束宽度低。另一方面，如果EC光束太宽，则NTM稳定时间会花费太长时间。因此，发现最佳EC波束宽度范围存在于NTM的反馈稳定中。

著录项

  • 来源
    《Nuclear fusion》 |2018年第1期|016042.1-016042.12|共12页
  • 作者

    Minho Park; Yong-Su Na; Jaemin Seo; M. Kim; Kyungjin Kim;

  • 作者单位

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea;

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea;

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea;

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea,Future&Challenge Co., Ltd, Yongin, Gyunggi-Do, Republic of Korea;

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea,Oak Ridge National Laboratory, Oak Ridge, TN, 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

    neoclassical tearing mode; integrated modeling; minimum seeking controller; ITER hybrid scenario; electron cyclotron beam width;

    机译：新古典的撕裂模式集成建模;最低限度寻求控制者;ITER混合情景;电子回旋加速器束宽;

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