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Nonlinear fishbone dynamics in spherical tokamaks

机译：球形托卡马克中的非线性鱼骨动力学

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摘要

Linear and nonlinear kinetic-MHD hybrid simulations have been carried out to investigate linear stability and nonlinear dynamics of beam-driven fishbone instability in spherical tokamak plasmas. Realistic NSTX parameters with finite toroidal rotation were used. The results show that the fishbone is driven by both trapped and passing particles. The instability drive of passing particles is comparable to that of trapped particles in the linear regime. The effects of rotation are destabilizing and a new region of instability appears at higher q_(min) (> 1.5) values, q_(min) being the minimum of safety factor profile. In the nonlinear regime, the mode saturates due to flattening of beam ion distribution, and this persists after initial saturation while mode frequency chirps down in such a way that the resonant trapped particles move out radially and keep in resonance with the mode. Correspondingly, the flattening region of beam ion distribution expands radially outward. A substantial fraction of initially non-resonant trapped particles become resonant around the time of mode saturation and keep in resonance with the mode as frequency chirps down. On the other hand, the fraction of resonant passing particles is significantly smaller than that of trapped particles. Our analysis shows that trapped particles provide the main drive to the mode in the nonlinear regime.
机译：已经进行了线性和非线性动力学-MHD混合仿真，以研究球形托卡马克等离子体中束驱动鱼骨不稳定性的线性稳定性和非线性动力学。使用具有有限环形旋转的实际NSTX参数。结果表明，鱼骨受捕获粒子和经过粒子的驱动。在线性状态下，通过粒子的不稳定性驱动与捕获粒子的不稳定性驱动相当。旋转的影响变得不稳定，并且更高的q_（min）（> 1.5）值出现了一个新的不稳定区域，q_（min）是安全系数曲线的最小值。在非线性状态下，模态由于束离子分布的平坦化而饱和，并且在初始饱和后这种模式仍然存在，而模态频率则逐渐降低，以使共振捕获的粒子径向移出并与模态保持共振。相应地，束离子分布的平坦区域径向向外扩展。最初的非谐振陷波粒子的很大一部分在模式饱和时变为谐振，并随着频率线性下降而保持与模式谐振。另一方面，共振通过的粒子的比例明显小于捕获的粒子的比例。我们的分析表明，在非线性状态下，被捕获的粒子为该模式提供了主要驱动力。

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  • 来源
    《Nuclear fusion》 |2017年第1期|016034.1-016034.11|共11页
  • 作者

    Feng Wang; G.Y. Fu; Wei Shen;

  • 作者单位

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA,Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education),School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024,People's Republic of China;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA,Institute for Fusion Theory and Simulation and Department of Physics Hangzhou, Zhejiang University,Hangzhou, 310027, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, 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

    NSTX; fishbone; frequency chirping; nonlinear dynamics; wave-particle interaction;

    机译：NSTX;鱼骨频率chi非线性动力学;波粒相互作用;

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