Unstable ion cyclotron harmonic waves generated by inhomogeneity and the ion beam in an ion-beam-plasma system

被引：4

作者：

Utsunomiya, S ^{[1
]}

Iwamoto, S ^{[1
]}

Kondo, T ^{[1
]}

Sugawa, M ^{[1
]}

Maehara, T ^{[1
]}

Sugaya, R ^{[1
]}

机构：

[1] Ehime Univ, Fac Sci, Dept Phys, Matsuyama, Ehime 7908577, Japan

来源：

JOURNAL OF PLASMA PHYSICS | 2001年 / 66卷

关键词：

D O I：

10.1017/S0022377801001209

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

In an ion-beam-inhomogeneous-plasma system, when the drift. frequency omega* exceeds a harmonic of the ion cyclotron frequency nomega(ci), ion cyclotron harmonic waves are excited via the plasma inhomogeneity. These waves are strongly enhanced by ion-beam injection parallel to the magnetic field. As the plasma inhomogeneity is increased, the number of unstable modes increases as does their amplitude. Ion cyclotron harmonic waves with frequencies up to 4omega(ci) are observed experimentally; at least five modes become unstable, and these unstable waves have different, azimuthal mode. numbers l = 1 or 2. The dispersion relations of observed multiple ion cyclotron harmonic waves agree well with the theoretical ones, taking into account. the plasma inhomogeneity and the ion beam.

引用

页码：27 / 37

页数：11

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