反剪切剖面下的非共振鱼骨模不稳定性混合模拟  

Hybrid simulation of non-resonant fishbone instabilitieswith reversed shear profile

作　　者：徐敬坤 任珍珍 汪卫华 XU Jing-kun;REN Zheng-zheng;WANG Wei-hua(School of Computer Science and Engineering,Anhui University,Hefei 230601;School of Physics and Optoelectronic Engineering,Anhui University,Hefei 230601;School of Physics and Materials Science,Anhui University,Hefei 230601)

机构地区：[1]安徽大学计算机科学与技术学院,合肥230601 [2]安徽大学物理与光电学院,合肥230601 [3]安徽大学物质科学与技术研究院,合肥230601

出　　处：《核聚变与等离子体物理》2024年第1期85-91,共7页Nuclear Fusion and Plasma Physics

基　　金：国家自然科学基金(11975022);国家重点研发计划(2018YFE0309100,2017YFE0300603,2018YFE0310400)。

摘　　要：利用磁流体动理学混合模拟程序M3D-K对具有反剪切剖面下的非共振鱼骨模不稳定性进行了线性模拟。在类EAST参数下,当安全因子最小值略大于1时,捕获高能量粒子可以激发非共振鱼骨模不稳定性。详细分析了高能量粒子比压的份额βhot/βtotal、中心螺旋角、注入能量、安全因子最小值qmin及其径向位置等参数对鱼骨模的影响。当螺旋角约为0.7时,模结构表现出双模扭曲特征。当qmin大于1.08时,不稳定性从鱼骨模向β诱导的比压阿尔芬本征模转移。从螺旋角为0.7的傅里叶分析和螺旋角为0.8的绝热系数扫描结果可以看出,非共振鱼骨模和β诱导的比压阿尔芬本征模可以同时存在,模频率与安全因子剖面向右移动的关系与理论分析一致。The linear simulation of non-resonant fishbone(NRF)instabilities with reversed shear profile has been investigated by M3D-K.Based on EAST-like parameters,the NRF instability can be driven by the trapped energetic ions as minimum safety factor is a little larger than unity.The effect of important parameters on the fishbone such as the fraction of energetic particle betaβhot/βtotal,central pitch angleΛ0,injection energy E,the minimum safety factor qmin,and radial position of qmin have been analyzed in detail,while beta-induced Alfvén Eigenmode(BAE)is found in some simulation cases.In addition,the instability transfers from the fishbone to BAE when qmin is larger than 1.08.Judging from the results obtained by the Fourier analysis withΛ0=0.7 and the specific heat coefficients scanned withΛ0=0.8,it is revealed that NRF and BAE can coexist when the central pitch angle is 0.7~0.9.Finally,the relation between mode frequency and the radial position of qmin is consistent with theoretical analysis.

关 键 词：鱼骨模不稳定性 反剪切剖面 捕获高能量粒子 比压阿尔芬本征模 

分 类 号：O534.2[理学—等离子体物理]