简单磁化环形等离子体中非扩散超热离子输运
Nondiffusive suprathermal ion transport in simple magnetized toroidal plasmas
摘要：
本文研究了在理想交换不稳定性驱动的静电湍流存在下，简单磁化环形等离子体中的超热离子动力学。从流体模拟的湍流场中使用的非相对论方程的离子运动计算超热示踪离子轨迹。超热离子分散开始于一个短暂的弹道阶段，在此期间粒子不与等离子体相互作用，随后是湍流相互作用阶段。在这个简单的系统中，我们观察到整个光谱的超热离子动力学，从亚扩散到超扩散，取决于束能量和湍流振幅。我们估计的弹道阶段的持续时间，并确定在相互作用阶段的基本机制，确定超热离子分散的光束能量和湍流波动幅度的字符。
英文摘要：
We investigate suprathermal ion dynamics in simple magnetized toroidal plasmas in the pres- ence of electrostatic turbulence driven by the ideal interchange instability. Turbulent fields from fluid simulations are used in the non-relativistic equation of ion motion to compute suprathermal tracer ion trajectories. Suprathermal ion dispersion starts with a brief ballistic phase, during which particles do not interact with the plasma, followed by a turbulence interaction phase. In this one simple system, we observe the entire spectrum of suprathermal ion dynamics, from subdiffusion to superdiffusion, depending on beam energy and turbulence amplitude. We estimate the duration of the ballistic phase and identify basic mechanisms during the interaction phase that determine the character of suprathermal ion dispersion upon the beam energy and turbulence fluctuation amplitude.
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