Nonlocal aspects of electrostatic current‐driven ion cyclotron instability due to magnetic shear
作者:
G. Ganguli,
P. Bakshi,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1982)
卷期:
Volume 25,
issue 10
页码: 1830-1837
ISSN:0031-9171
年代: 1982
DOI:10.1063/1.863661
出版商: AIP
数据来源: AIP
摘要:
The effect of the magnetic shear on the current‐driven ion cyclotron instability has been studied. Taking into account the asymmetry introduced by the external current, an analytical theory to study the nonlocal behavior of this instability is given. The main consequences of the magnetic shear are to (i) localize the instability in space and (ii) reduce the growth rates in general. The damping influence of shear arises in two distinct ways; (a) a damping rate directly proportional to the shear strength, and (b) a damping rate (due to the nonlocal nature of the dispersion relation) not explicitly dependent on shear which can be quite strong for above marginal currents. Shear makes this instability more coherent by reducing the band of the perpendicular wavelengths which is unstable. The general physics of this instability and the parametric dependences of the growth rates are studied and marginal stability curves given.
点击下载:
PDF
(664KB)
返 回