文献类型：期刊文献

英文题名：Study of Reversed Shear Alfven Eigenmodes with Down Sweeping Frequency in HL-2A Experiment at qmin ～ 1

作者：Zhang, Xianmei[1];Chen, Wei[2];Yu, Limin[1];Sheng, Zheng-Mao[3];Xue, Erbing[1]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Southwestern Inst Phys, Chengdu 610041, Peoples R China;[3]Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China

年份：2016

卷号：85

期号：9

外文期刊名：JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000382254400030)】；

基金：One of authors (Limin Yu) gratefully acknowledges Dr. G. Y. Fu for fruitful discussions. This work is supported in part by the National Magnetic Confinement Fusion Science Program under Grant Nos. 2013GB104000, 2013GB106000, and 2015GB110005, and by the National Natural Science Foundation of China under Grant Nos. 11475058, 11075140, 11205060, and 11405058.

语种：英文

摘要：The reserved shear Alfven eigenmodes (RSAEs) whose frequencies sweep down have been observed in HL-2A plasmas at q similar to 1 during current ramp-up and NBI+ECRH recently. The kinetic Alfvn eigenmode code (KAEC), which is a non-perturbative kinetic/magnetohydrodynamic eigenvalue code for calculating kinetic damping of shear Alfvn eigenmodes, is used to investigate the modes according to the experimental data. It is found that the kinetic reversed shear Alfven eigenmodes (KRSAEs) with downsweeping frequency and localized radial structure would appear, which are consistent with the observations. The theoretical analysis for the existence of the mode and the scaling of the mode width are provided. It is shown that the mode width of KRSAEs is proportional to the square root of thermal ion Larmor radius.