M3D-K simulations of sawteeth and energetic particle transport in tokamak plasmas
M3D-K simulations of sawteeth and energetic particle transport in tokamak plasmas
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DOI：
10.1063/1.4896341
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发表时间：
2013-11
影响因子：
2.2
通讯作者：
Weiqiao Shen;G. Fu;Z. Sheng;J. Breslau;Feng Wang
中科院分区：
文献类型：
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作者：
Weiqiao Shen;G. Fu;Z. Sheng;J. Breslau;Feng Wang
使用动力学/磁流体动力学（MHD）混合程序M3 D-K进行锯齿和相关高能粒子输运的非线性模拟。MHD模拟表明，重复的托卡马克模型平衡的周期。此外，进行了试验粒子模拟，以研究高能粒子输运由于一个碰撞。结果表明，高能粒子在等离子体核中径向重新分布，这取决于俯仰角和能量。对于被捕获的粒子，重新分配发生在粒子能量低于临界值与现有理论一致。对于共同通过的粒子，重分布是强的，几乎不依赖于粒子能量。相反，反向通过粒子的再分布水平随着粒子能量的增加而降低。
Nonlinear simulations of sawteeth and related energetic particle transport are carried out using the kinetic/magnetohydrodynamic (MHD) hybrid code M3D-K. MHD simulations show repeated sawtooth cycles for a model tokamak equilibrium. Furthermore, test particle simulations are carried out to study the energetic particle transport due to a sawtooth crash. The results show that energetic particles are redistributed radially in the plasma core, depending on pitch angle and energy. For trapped particles, the redistribution occurs for particle energy below a critical value in agreement with existing theories. For co-passing particles, the redistribution is strong with little dependence on particle energy. In contrast, the redistribution level of counter-passing particles decreases with increasing particle energy.