Effects of α particles on the resistive wall mode stability in ITER
Effects of α particles on the resistive wall mode stability in ITER
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DOI：
10.1088/0029-5515/50/9/095008
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发表时间：
2010-07
期刊：
影响因子：
3.3
通讯作者：
Yueqiang Liu
中科院分区：
文献类型：
--
作者：
Yueqiang Liu
针对ITER中的一种先进稳态方案，数值研究了聚变产生的α粒子对RWM稳定性的影响。与单独的热粒子动力学贡献相比，发现α贡献通常是稳定的。同样的结论是实现以下两个微扰和自洽的方法。后者通常比前者预测更少的稳定。在足够高的等离子体压力，自洽的方法预测两个不稳定的分支研究ITER等离子体在这里。α粒子的稳定作用一般较弱，特别是在稳定边界的修正方面。只有在等离子体旋转频率足够快的情况下，这种效应才会更加明显，与α进动频率大致匹配，α进动频率大约是ITER环形阿尔文频率的百分之几。一个简单的，基于能量原理，鱼骨状色散关系，提出了一个定性的理解的数值结果。
The effects of the fusion born α particles on the stability of the RWM are numerically investigated for one of the advanced steady state scenarios in ITER. The α contribution is found to be generally stabilizing, compared with the thermal particle kinetic contribution alone. The same conclusion is achieved following both a perturbative and self-consistent approach. The latter generally predicts less stabilization than the former. At high enough plasma pressure, the self-consistent approach predicts two unstable branches for the ITER plasma studied here. The stabilizing effect from α particles is found to be generally weak, in particular in terms of the modification of the stability boundary. The effect is more pronounced only at fast enough plasma rotation frequency, roughly matching the α precession frequency, which is in the order of a few per cent of the toroidal Alfvén frequency for ITER. A simple, energy principle based, fishbone-like dispersion relation is proposed to gain a qualitative understanding of the numerical results.