Stability analysis of viscous Z-pinch plasma with a sheared axial flow |
| |
Authors: | Zhang Yang and Ding Ning |
| |
Institution: | Institute of Applied Physics and Computational Mathematics,
PO Box 8009, Beijing 100088, China |
| |
Abstract: | Within the magnetohydrodynamics (MHD) frame, we analyse the effect
of viscosity on magneto-Rayleigh--Taylor (MRT) instability in a
Z-pinch configuration by using an exact method and an approximate
method separately. It is demonstrated that the plasma viscosity
indeed has a stabilization effect on the MRT mode in the whole
wavenumber region, and its influence increases with the perturbation
wavenumber increasing. After the characteristics and feasibility of
the approximate method have been investigated, we apply it to the
stability analysis of viscous plasma where a sheared axial flow
(SAF) is involved, and we attain an analytical dispersion relation.
It is suggested that the viscosity and the SAF are complemental with
each other, and a wide wavenumber range of perturbation is possible
to be restrained if the SAF and the viscosity are large enough.
Finally, we calculate the possible value of viscosity parameter
according to the current experimental conditions, and the results
show that since the value of viscosity is much less than the
threshold value, its mitigation effect is small enough to be
neglected. The role of the viscosity in the stabilization becomes
considerable only if special techniques are so developed that the
Z-pinch plasma viscosity can be increased greatly. |
| |
Keywords: | Z-pinch magneto-Rayleigh-Taylor
(MRT) instability viscosity sheared axial flow |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|