Nonlinear Hybrid Simulations of Energetic Particle Modes in Realistic Tokamak Flux Surface Geometry
Nonlinear Hybrid Simulations of Energetic Particle Modes in Realistic Tokamak Flux Surface Geometry
复制标题
DOI：
10.1585/pfr.6.2403109
复制
发表时间：
2011-08
影响因子：
0.8
通讯作者：
A. Bierwage;Y. Todo;N. Aiba;K. Shinohara;Masao Ishikawa;M. Yagi
中科院分区：
文献类型：
--
作者：
A. Bierwage;Y. Todo;N. Aiba;K. Shinohara;Masao Ishikawa;M. Yagi
提出了使用真实托卡马克几何结构对高能粒子模式进行非线性模拟以及由此产生的高能离子输运的第一个结果，并将其与通过平移圆模型平衡和其他等效参数获得的结果进行了比较。两种情况下激发的模式具有相似的频率和模式结构，并且在非线性演化的前几百个阿尔文时间期间引起相似量的高能离子传输。传输方面的相似性很有趣，因为它与非圆形情况下降低的线性增长率和饱和水平形成对比：对于所选择的参数，与圆形情况相比，两者都减少了 2 倍。这些结果激发了进一步的研究，包括用其他代码验证我们的结果，澄清线性稳定的机制，以及对非线性演化过程中的模式活动和粒子重新分布的详细分析。
First results from nonlinear simulations of energetic particle modes and the resulting transport of energetic ions using realistic tokamak geometry are presented and compared with results obtained with a shifted-circle model equilibrium and otherwise equivalent parameters. The modes excited in both cases have similar frequen- cies and mode structuresand cause a similar amount of energetic ion transport during the first few hundred Alfven times of the nonlinear evolution. The similarity in transport is interesting since it stands in contrast to the reduced linear growth rate and saturation level in the non-circular case: for the parameters chosen, both are reduced by a factor of 2 compared to the circular case. These results motivate further studies, including a verification of our results with other codes, a clarification of the mechanisms underlying the linear stabilization, and a detailed analysis of the mode activity and particle redistribution during the nonlinear evolution.