Magneto-Rayleigh-Taylor instability in compressible Z-pinch liner plasmas

In this paper, the characteristics of magneto-Rayleigh-Taylor（MRT） instability of liner plasmas in Mag LIF is theoretically investigated. A three-region slab model, based on ideal MHD equations, is used to derive the dispersion relation of MRT instability. The effect of compressibility on the develo...

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Bibliographic Details
Published inChinese physics B Vol. 26; no. 7; pp. 244 - 249
Main Author 杨学 肖德龙 丁宁 刘杰
Format Journal Article
LanguageEnglish
Published 01.06.2017
Subjects
MHD方程
Rayleigh
Taylor
Z箍缩等离子体
不可压缩
不稳定性
压缩条件
衬垫
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/26/7/075202

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Summary:In this paper, the characteristics of magneto-Rayleigh-Taylor（MRT） instability of liner plasmas in Mag LIF is theoretically investigated. A three-region slab model, based on ideal MHD equations, is used to derive the dispersion relation of MRT instability. The effect of compressibility on the development of MRT instability is specially examined. It is shown that the growth rate of MRT instability in compressible condition is generally lower than that in incompressible condition in the presence of magnetic field. In the case of zero magnetic field, the growth rate in compressible assumption is approximately the same as that in incompressible assumption. Generally, MRT instability in（x, y） plane can be remarkably mitigated due to the presence of magnetic field especially for short-wavelength perturbations. Perturbations may be nearly completely mitigated when the magnetic field is increased to over 1000 T during liner implosions. The feedthrough of MRT instability in liner outer surface on inner surface is also discussed.
Bibliography:Xue Yang1,2,De-Long Xiao1,Ning Ding1,Jie Liu1,3（ 1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China ;2 Graduate School, China Academy of Engineering Physics, Beijing 100088, China ; 3 HEDPS, CAPT, and CICIFSA MoE, Peking University, Beijing 100871, China）
magneto-Rayleigh-Taylor（MRT） instability; magnetized liner inertial fusion（Mag LIF）; Z-pinch; compressibility
In this paper, the characteristics of magneto-Rayleigh-Taylor（MRT） instability of liner plasmas in Mag LIF is theoretically investigated. A three-region slab model, based on ideal MHD equations, is used to derive the dispersion relation of MRT instability. The effect of compressibility on the development of MRT instability is specially examined. It is shown that the growth rate of MRT instability in compressible condition is generally lower than that in incompressible condition in the presence of magnetic field. In the case of zero magnetic field, the growth rate in compressible assumption is approximately the same as that in incompressible assumption. Generally, MRT instability in（x, y） plane can be remarkably mitigated due to the presence of magnetic field especially for short-wavelength perturbations. Perturbations may be nearly completely mitigated when the magnetic field is increased to over 1000 T during liner implosions. The feedthrough of MRT instability in liner outer surface on inner surface is also discussed.
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/26/7/075202