教授 硕士生导师
性别: 女
毕业院校: 大连理工大学
学位: 博士
所在单位: 物理学院
学科: 等离子体物理
办公地点: 物理楼401办公室
电子邮箱: zhengshu@dlut.edu.cn
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论文类型: 期刊论文
发表时间: 2011-03-01
发表刊物: NUCLEAR FUSION
收录刊物: Scopus、SCIE、EI
卷号: 51
期号: 3
ISSN号: 0029-5515
摘要: Scaling laws of fast growth of collisionless double tearing modes in the linear phase are studied numerically by a reduced magnetohydrodynamics model in a cylindrical plasma. It is found that in the case rho(s) << d(e), with d(e) the electron inertial skin depth and rho(s) the ion sound gyroradius, the scaling of the linear growth rate changes gradually from gamma similar to d(e)(1) to gamma similar to d(e)(3) as the rational surface separation Delta r(s) increases. In the case d(e) << rho(s), on the other hand, the scaling shifts gradually from gamma similar to d(e)(1/3) or gamma similar to rho(2/3)(s) to gamma similar to d(e)(1) or gamma similar to rho(1)(s) as Delta r(s) increases. In the small Delta r(s) regime, furthermore, it is shown that for short wavelength unstable modes, the scaling on d(e) and rho(s) as their poloidal mode number varies is similar to that as Delta r(s) does. In addition, rho(s) is found to play an important role in reducing the scaling dependence on d(e). These numerical scaling laws are testified to be reasonable in comparison with previous analytical theories, based on the similarity of physical characteristics of the same Delta' categories in tearing modes, where Delta' is the linear instability parameter for tearing modes. Finally, the characteristics of the second unstable eigenmode with different mode numbers, under the influence of d(e) and rho(s), are obtained and analysed.