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Energetic particle effects on n = 1 resistive MHD instabilities in a DIII-D hybrid discharge

机译：高能粒子对DIII-D混合放电中n = 1的电阻MHD不稳定性的影响

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摘要

The Sf kinetic-magnetohydrodynamic (MHD) model in the 3D extended-MHD code NIMROD is used to perform a linear simulation study of energetic particle effects on the n = 1 mode in a DIII-D hybrid discharge. The hybrid discharge has a long steady state with low q_(min)≥ 1 at high confinement, is useful for numerous physics studies, and is a candidate operational scenario for burning plasma experiments. But hybrid discharges are limited to moderate βn by the m = 2/1 instability, which onsets with small increases in βN. Using realistic equilibria based on experimental reconstructions from DIII-D, the stability of the n = 1 mode during the steady state of a hybrid discharge is computed over a (q_(min), βn) space. MHD stability analyses do not indicate instability to the n = 1 for small increases in βN above that of the experimental discharge. Our results show that energetic particles significantly change the stability map in (q_(min), βn) parameter space from the MHD-only result. Unstable modes are driven by energetic particles far into the MHD stable region in (q_(min),βn) space. Three different unstable regions are identified, each being defined by the fastest growing mode and distinctly different frequencies. We examine sample eigenmodes from these three regions. At low q_(min) ～ 1 the drive is associated with the fishbone mode, while the higher q_(min) ≥ 1.12 the drive is associated with the Beta induced Alfven eigenmode. Overlaying the experimental trajectory in the same (q_(min), βn) parameter space shows that all three regions are in proximity to the trajectory. In the higher q_(min) region a mode with a broad m = 2/1 dominant structure is most unstable, while in the region of the trajectory the most unstable mode has a m = 1/1 component localized near the axis. Experimentally, a nonlinearly saturated m = 1/1 structure is observed localized near the magnetic axis. This agreement suggests that the m = 2/1 mode may be triggered by energetic particles in these discharges.
机译：使用3D扩展MHD代码NIMROD中的Sf动力学磁流体动力学（MHD）模型对DIII-D混合放电中n = 1模式的高能粒子效应进行线性模拟研究。混合放电在高约束下具有长的稳态且q_（min）≥1低，可用于许多物理研究，并且是燃烧等离子体实验的候选操作方案。但是，由于m / n = 2/1的不稳定性，混合放电被限制在中等的βn值，βN的增加很小。使用基于DIII-D的实验重建的现实平衡，在（q_（min），βn）空间上计算混合放电稳态下n = 1模式的稳定性。 MHD稳定性分析并未表明对于βN的小幅增加（高于实验放电），n = 1是不稳定的。我们的结果表明，仅MHD结果，高能粒子会显着改变（q_（min），βn）参数空间中的稳定性图。不稳定模式由高能粒子驱动进入（q_（min），βn）空间中的MHD稳定区域。确定了三个不同的不稳定区域，每个区域由最快的增长模式和明显不同的频率定义。我们检查了这三个区域的样本本征模式。当q_（min）〜1低时，驱动器与鱼骨模式相关，而当q_（min）≥1.12时，驱动器与Beta诱导的Alfven本征模式相关。在相同的（q_（min），βn）参数空间中叠加实验轨迹表明，所有三个区域都靠近轨迹。在较高的q_（min）区域中，具有宽m / n = 2/1主导结构的模式最不稳定，而在轨迹区域中，最不稳定的模式具有位于轴附近的am / n = 1/1分量。 。实验上，在磁轴附近观察到非线性饱和的m / n = 1/1结构。该协议表明，m / n = 2/1模式可以由这些放电中的高能粒子触发。

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  • 来源
    《Nuclear fusion》 |2012年第3期|p.033004.1-033004.13|共13页
  • 作者

    D.P. Brennan; C.C. Kim; R.J. La Haye;

  • 作者单位

    Department of Physics, University of Tulsa, Tulsa, OK 74104, USA;

    Plasma Science and Innovation Center, University of Washington, Seattle, WA 98195, USA;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, 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);
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  • 正文语种 eng
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