Energetic particles and multi-scale dynamics in fusion plasmas
Energetic particles and multi-scale dynamics in fusion plasmas
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DOI：
10.1088/0741-3335/57/1/014024
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发表时间：
2014
影响因子：
2.2
通讯作者：
F. Zonca;Liu Chen;S. Briguglio;G. Fogaccia;A. Milovanov;Z. Qiu;G. Vlad;Xingan Wang
中科院分区：
文献类型：
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作者：
F. Zonca;Liu Chen;S. Briguglio;G. Fogaccia;A. Milovanov;Z. Qiu;G. Vlad;Xingan Wang
高能粒子（EP）在聚变等离子体中的作用是独特的，因为它们可以作为跨尺度耦合的介质。更具体地说，EP可以驱动宏观和中尺度上的不稳定性，以及微观热离子拉莫尔半径和宏观等离子体平衡尺度长度之间的中间。一方面，EP驱动的剪切Alfvén波（SAW）可以通过等离子体平衡和聚变反应性分布的相互作用向宏观系统提供非线性反馈。另一方面，EP驱动的不稳定性也可以激发SAW连续共振处的奇异径向模式结构，通过模式转换，产生微观波动，其可以传播并在其他地方被吸收，从而诱导非局部行为。因此，上述观察结果表明，基于EP和热等离子体的先进动力学处理的理论方法更适合于燃烧聚变等离子体。此外，高能粒子可以线性和非线性地（通过SAW）激发带状结构，从而作为非线性平衡的发生器，这些非线性平衡通常在与基础波动相同的时间尺度上演变。这些问题是在一个一般的理论框架内，讨论的证据，从数值模拟结果和实验观察。在凝聚态物理，非线性动力学和加速器物理问题的融合等离子体动力学的类比也被强调。
The role of energetic particles (EPs) in fusion plasmas is unique as they could act as mediators of cross-scale couplings. More specifically, EPs can drive instabilities on the macro- and meso-scales and intermediate between the microscopic thermal ion Larmor radius and the macroscopic plasma equilibrium scale lengths. On one hand, EP driven shear Alfvén waves (SAWs) could provide a nonlinear feedback onto the macro-scale system via the interplay of plasma equilibrium and fusion reactivity profiles. On the other hand, EP-driven instabilities could also excite singular radial mode structures at SAW continuum resonances, which, by mode conversion, yield microscopic fluctuations that may propagate and be absorbed elsewhere, inducing nonlocal behaviors. The above observations thus suggest that a theoretical approach based on advanced kinetic treatment of both EPs and thermal plasma is more appropriate for burning fusion plasmas. Energetic particles, furthermore, may linearly and nonlinearly (via SAWs) excite zonal structures, acting, thereby, as generators of nonlinear equilibria that generally evolve on the same time scale of the underlying fluctuations. These issues are presented within a general theoretical framework, discussing evidence from both numerical simulation results and experimental observations. Analogies of fusion plasmas dynamics with problems in condensed matter physics, nonlinear dynamics, and accelerator physics are also emphasized.