Hybrid magnetohydrodynamic‐gyrokinetic simulation of toroidal Alfvén modes
Hybrid magnetohydrodynamic‐gyrokinetic simulation of toroidal Alfvén modes
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DOI：
10.1063/1.871071
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发表时间：
1995-10
影响因子：
2.2
通讯作者：
S. Briguglio;G. Vlad;F. Zonca;C. Kar
中科院分区：
文献类型：
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作者：
S. Briguglio;G. Vlad;F. Zonca;C. Kar
共振高能粒子在确定环形阿尔芬本征模（TAE）的稳定性方面起着重要作用，它产生了众所周知的不稳定性驱动机制，并产生了有效的耗散，消除了剪切阿尔芬连续体局部振荡的奇异性，并产生了离散的动力学阿尔芬波（KAW）。两个反向传播的KAW的环形耦合产生TAE的动力学类似物，KTAE（动力学TAE）。这种现象的非微扰特性以及TAE和KAW之间的耦合，以及有限漂移轨道效应的相关性限制了分析方法对渐近状态的有效性，这很难与现实情况进行比较。发展了一个三维混合流-固初值程序，数值模拟了Alfven分支环形模的线性和非线性演化.结果表明，对于典型的参数KTAE，的确，比TAE更不稳定。
Resonant energetic particles play a major role in determining the stability of toroidal Alfven eigenmodes (TAE’s) by yielding the well‐known driving mechanism for the instability and by producing an effective dissipation, which removes the singular character of local oscillations of the shear‐Alfven continuum and gives discrete kinetic Alfven waves (KAW’s). Toroidal coupling of two counterpropagating KAW’s generates the kinetic analog of the TAE, the KTAE (kinetic TAE). The nonperturbative character of this phenomenon and of the coupling between TAE and KAW’s, and the relevance of finite drift‐orbit effects limit the effectiveness of the analytical approach to asymptotic regimes, which are difficult to compare with realistic situations. A three‐dimensional hybrid fluid‐particle initial‐value code for the numerical simulation of the linear and nonlinear evolution of toroidal modes of the Alfven branch has been developed. It is shown that for typical parameters the KTAE is, indeed, more unstable than the TAE.