Avalanche transport of energetic-ions in magnetic confinement plasmas: nonlinear multiple wave-number simulation
Avalanche transport of energetic-ions in magnetic confinement plasmas: nonlinear multiple wave-number simulation
复制标题
磁约束等离子体中高能离子的雪崩传输：非线性多波数模拟
DOI：
10.1088/1741-4326/ac38c6
复制
发表时间：
2021-11
期刊：
影响因子：
3.3
通讯作者：
Z.X. Wang
中科院分区：
文献类型：
--
作者：
X.L. Zhu;W. Chen;M. Podestà;F. Wang;D. Liu;Z.X. Wang
抽象的。在国家球形环实验（NSTX）中，中性束加热等离子体中经常发生大爆发活动，即环形阿尔文本征模（TAE）雪崩。基于NSTX上TAE雪崩的典型实验观测，提出了一种自洽的非线性多波数（k。利用TAE雪崩发生前的实验参数和剖面作为M3 D-K输入，进行了与TAE雪崩相关的模拟。在非线性多波数模拟中，发现了TAE雪崩过程中不同模式之间的波-波非线性耦合以及不同模式与能量离子之间的共振相互作用。在模拟中清楚地观察到TAE雪崩期间的共振重叠。研究发现，有效的波-波耦合和足够强的驱动力是TAE雪崩发生的两个重要因素。TAE雪崩被认为是一个强非线性过程，它总是伴随着同时快速的频率啁啾和大幅度的多个模式的爆发和显着的能量离子损失。在NSTX上观察到的实验现象，并定性地再现了在这项工作中的模拟结果。这些发现表明雪崩的发生是由系统的非线性触发的，也有助于理解未来燃烧等离子体（如国际热核聚变实验堆）中高能粒子雪崩输运的潜在机制。
Abstract. Large burst activity, identified as toroidal Alfvén eigenmode (TAE) avalanche, occurs frequently in neutral-beam heated plasmas in National Spherical Torus Experiment (NSTX). Based on the typical experimental observation of TAE avalanche on NSTX, a self-consistent nonlinear multiple wave-number (k. ∥ ≃ n/R, where n toroidal mode-number and R major radius) simulation associated with TAE avalanches is performed using the experimental parameters and profiles before the occurrence of TAE avalanche as the M3D-K input. The wave–wave nonlinear coupling among different modes and the resonant interaction between different modes and energetic-ions during TAE avalanches are identified in the nonlinear multiple wave-number simulations. The resonance overlap during the TAE avalanche is clearly observed in the simulation. It is found that the effective wave–wave coupling and a sufficiently strong drive are two important ingredients for the onset of TAE avalanches. TAE avalanche is considered to be a strongly nonlinear process and it is always accompanied by the simultaneous rapid frequency-chirping and large amplitude bursting of multiple modes and significant energetic-ion losses. The experimental phenomenon is observed on NSTX and is qualitatively reproduced by the simulation results in this work. These findings indicate that the onset of avalanche is triggered by nonlinearity of the system, and are also conducive to understanding the underlying mechanism of avalanche transport of energetic particles in the future burning plasmas, such as International Thermonuclear Experiment Reactor.
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DOI：
10.1007/s41614-018-0022-9
发表时间：
2018-12
期刊：
Reviews of Modern Plasma Physics
影响因子：
--
作者：
Y. Todo
通讯作者：
Y. Todo
影响因子：
3.3
作者：
M. Podestà;R. Bell;A. Bortolon;N. Crocker;D. Darrow;A. Diallo;E. Fredrickson;Guoyong Fu;
通讯作者：
M. Podestà;R. Bell;A. Bortolon;N. Crocker;D. Darrow;A. Diallo;E. Fredrickson;Guoyong Fu;
DOI：
10.2172/750291
发表时间：
1999-04
期刊：
--
影响因子：
--
作者：
W. Park;E. Belova;G. Fu
通讯作者：
W. Park;E. Belova;G. Fu
影响因子：
8.6
作者：
Hao Wang;Y. Todo;T. Ido;Yasuhiro Suzuki
通讯作者：
Hao Wang;Y. Todo;T. Ido;Yasuhiro Suzuki
影响因子：
2.2
作者：
Weiqiao Shen;G. Fu;Z. Sheng;J. Breslau;Feng Wang
通讯作者：
Weiqiao Shen;G. Fu;Z. Sheng;J. Breslau;Feng Wang