用MEGA程序模拟TAE频率啁啾期间的对流输运
Simulation of convective transport during frequency chirping of a TAE using the MEGA code
摘要：
本文提出了一种研究托卡马克等离子体中长程频率啁啾现象时高能粒子相空间的方法。为了应用所提出的方法，我们进行了自洽模拟使用MEGA代码和分析的模拟数据。我们证明了一个行波在相空间，并存在特定的切片相空间上的共振粒子在整个波的演变。对于非线性演化的n=6环形诱导Alfven本征模（TAE），我们的研究结果揭示了相干相空间结构（孔/团块）的形成后粗粒化的分布函数。这些结构导致相空间中的对流传输，这意味着共振粒子的径向漂移。我们还表明，频率啁啾率的TAE阻尼率的增加。我们观察到的TAE行为和相应的相空间动力学与Berk-Breizman（BB）理论是一致的。
英文摘要：
We present a procedure to examine energetic particle phase-space during long range frequency chirping phenomena in tokamak plasmas. To apply the proposed method, we have performed self-consistent simulations using the MEGA code and analyzed the simulation data. We demonstrate a travelling wave in phase-space and that there exist specific slices of phase-space on which the resonant particles lie throughout the wave evolution. For non-linear evolution of an n=6 toroidicity-induced Alfven eigenmode (TAE), our results reveal the formation of coherent phase-space structures (holes/clumps) after coarse-graining of the distribution function. These structures cause a convective transport in phase-space which implies a radial drift of the resonant particles. We also demonstrate that the rate of frequency chirping increases with the TAE damping rate. Our observations of the TAE behaviour and the corresponding phase-space dynamics are consistent with the Berk-Breizman (BB) theory.
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