Magnetorotational Instability in a Couette Flow of Plasma
作者:
Koichi Noguchi,
Vladimir I. Pariev,
期刊:
AIP Conference Proceedings
(AIP Available online 1903)
卷期:
Volume 692,
issue 1
页码: 285-292
ISSN:0094-243X
年代: 1903
DOI:10.1063/1.1635188
出版商: AIP
数据来源: AIP
摘要:
All experiments, which have been proposed so far to model the magnetorotational instability (MRI) in the laboratory, involve a Couette flow of liquid metals in a rotating annulus. All liquid metals have small magnetic Prandtl numbers, Pm ∼ 10−6, the ratio of kinematic viscosity to magnetic diffusivity. With plasmas both large and small Pm are achievable by varying the temperature and the density of plasma. Compressibility and fast rotation of the plasma result in radial stratification of the equilibrium plasma density. Evolution of perturbations in radially stratified viscous and resistive plasma permeated by an axial uniform magnetic field is considered. The differential rotation of the plasma is induced by theE×Bdrift in applied radial electric field. Global unstable eigenmodes are calculated by our newly developed matrix code. The plasma is shown to be MRI unstable for parameters easily achievable in experimental setup. © 2003 American Institute of Physics
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