文献类型：期刊文献

中文题名：EAST装置中捕获电子模线性增长率的回旋动理学模拟

英文题名：Gyrokinetic Simulation for Trapped Electron Mode Linear Growth Rate in EAST Tokamak

作者：陈卫栋[1];张先梅[1];薛二兵[1];虞立敏[1]

机构：[1]华东理工大学理学院

年份：2019

卷号：45

期号：5

起止页码：776

中文期刊名：东华大学学报（自然科学版）

外文期刊名：Journal of Donghua University(Natural Science)

收录：CSTPCD;;北大核心:【北大核心2017】；

基金：国家自然科学基金资助项目(11675053)

语种：中文

中文关键词：等离子体;捕获电子模;回旋动理学模拟;增长率

外文关键词：plasma;trapped electron mode;gyrokinetic simulation;growth rate

摘要：基于全超导托卡马克(experimental and advanced superconducting tokamak, EAST)中以电子加热为主的放电试验,使用GTC(Gyrokinetic Toroidal Code)代码进行线性回旋动理学模拟,研究等离子体参数对捕获电子模(trapped electron mode, TEM)线性增长率(γ)的影响。结果表明,γ随电子与离子温度比( T e / T i )和归一化电子温度梯度( R / L T e )的增大而增大,但随着归一化密度梯度( R / L n )的增加而降低。安全因子( q )和磁剪切( s ∧)对TEM线性增长率的影响与归一化半径范围内(ρ<0.4) s ∧值的大小有关。当 s ∧>0.3时,γ随着 q 的增大而增大,随着 s ∧的增大而减小,与简化模型的理论分析一致。然而,当 s ∧<0.3时出现了相反的结果,即γ随 q 的增大而减小,随着 s ∧的增大而增大,其原因可能是较小的 s ∧无法抑制TEM湍流。
Based on dominant electron heating experiments with trapped electron mode (TEM) turbulence in EAST (experimental and advanced superconducting tokamak), linear gyrokinetic simulation using the GTC (Gyrokinetic Toroidal Code ) code was carried out to study the effect of plasma parameters on TEM linear growth rate (γ). The results indicate that γ increases with temperature ratio T e / T i and normalized temperature gradient ( R / L T e ), but decreases with normalized density gradient ( R / L n ). The effects of safety factor (q) and magnetic shear (s ∧) on TEM linear growth rate are related to different s ∧ value in the range of normalized minor radius (ρ<0.4). When s ∧ is larger than 0.3 within ρ<0.4,γ increases with q increasing and decreases with s ∧ increasing, which is consistent with theoretical analysis by a reduced model. However, when s ∧ is smaller than 0.3 within ρ<0.4, the opposite results are obtained, namely γ decreases with q increasing and increases with s ∧ increasing, and the reason may be that the small s ∧ cannot suppress TEM turbulence.