Structure-preserving electromagnetic– kinetic simulations of lower hybrid-wave injection and current drive
Structure-preserving electromagnetic– kinetic simulations of lower hybrid-wave injection and current drive
复制标题
较低混合波注入和电流驱动的结构保持电磁动力学模拟
DOI：
10.1088/1361-6587/abc297
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Hong An
中科院分区：
文献类型：
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作者：
Jiangshan Zheng;Junshi Chen;Fan Lu;Jianyuan Xiao;Hong An
本文用第一性原理电磁动力学方法模拟了具有真实离子-电子质量比的电子-氢等离子体中低杂波的慢波分支。用不同的等离子体参数构造了几个含有格栅天线的二维板结构模型。基于我们最近发展的完全动力学、电荷守恒的电磁非正则辛粒子格子方法，研究了热等离子体中低杂波的耦合、传输、吸收和电流驱动效应，得到了格栅天线的耦合系数、可及条件和电子朗道阻尼率，与理论和以前的模拟结果符合得很好。还给出了低杂波的长期非线性能量和电流沉积，与线性理论预测相比，加热效率和电流驱动效率都有所降低。电子和离子之间的碰撞效应实际上对驱动电流是很重要的。给出了产生电流密度与低杂波幅值之间的关系，与一维理论预测定性一致。
In this article, we present a first-principles electromagnetic–kinetic simulation of the slow-wave.branch of the lower hybrid waves (LHWs) in electron–deuterium plasmas with real ion–electron.mass ratios. Several models of two-dimensional slab configuration containing a grill antenna are.constructed using different plasma parameters. Based on our recently developed fully kinetic.charge-conservative electromagnetic non-canonical symplectic particle-in-cell method, we.studied the coupling, propagation, absorption and current driving effect of LHWs in hot plasmas..The results for the coupling coefficient of the grill antenna, accessibility condition, and electron.Landau damping rate show good agreement with theory and previous simulation. The long-term.non-linear energy and current deposition of propagating LHWs are also presented, which show.a decrement of heating and current-driving efficiency compared with the linear theoretical.prediction. The collision effect between electrons and ions is shown to be important for actually.driving the current. The relation between the density of the current generated and the amplitude.of the LHW is given, which shows a qualitative agreement with the 1D theoretical prediction.