验证静电turbulence中α粒子的模拟假设
Validating modelling assumptions of alpha particles in electrostatic turbulence
摘要：
为了严格模拟聚变等离子体中的快离子，必须使用非麦克斯韦平衡分布。本文分析了几种不同托卡马克参数下高能α粒子对静电湍流的响应。我们的结果与已知的尺度和实验证据一致，即α粒子通常被很好地限制：大约几秒。它也被证实，在现实中的低浓度，与线性理论一致的α的湍流的影响是可以忽略不计的。它表明，通常的做法，使用高温麦克斯韦给出不正确的估计径向α粒子通量，并提供了一种方法来纠正它。此外，我们看到与碰撞和运输相关的时间尺度在中等能量下竞争，这对α粒子仍然局限于用于推导减速分布的通量表面的假设提出了质疑。
英文摘要：
To rigorously model fast ions in fusion plasmas, a non-Maxwellian equilibrium distribution must be used. In the work, the response of high-energy alpha particles to electrostatic turbulence has been analyzed for several different tokamak parameters. Our results are consistent with known scalings and experimental evidence that alpha particles are generally well-confined: on the order of several seconds. It is also confirmed that the effect of alphas on the turbulence is negligible at realistically low concentrations, consistent with linear theory. It is demonstrated that the usual practice of using a high-temperature Maxwellian gives incorrect estimates for the radial alpha particle flux, and a method of correcting it is provided. Furthermore, we see that the timescales associated with collisions and transport compete at moderate energies, calling into question the assumption that alpha particles remain confined to a flux surface that is used in the derivation of the slowing-down distribution.
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