Numerical analysis of hydrodynamic instability in magnetized laser ablation flow

被引:2
|
作者
Ohnishi, Naofumi [1 ]
Ishii, Ayako [1 ]
Kuramitsu, Yasuhiro [2 ]
Morita, Taichi [3 ]
Sakawa, Youichi [3 ]
Takabe, Hideaki [3 ]
机构
[1] Tohoku Univ, Dept Aerosp Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan
[2] Natl Cent Univ, Dept Phys, Taoyuan 320, Taiwan
[3] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan
基金
日本学术振兴会;
关键词
Radiation magneto-hydrodynamics; Laser ablation; Hydrodynamic instability; Laboratory astrophysics; RICHTMYER-MESHKOV INSTABILITY; FIELD AMPLIFICATION; ACCELERATION; MAGNETOHYDRODYNAMICS; SCHEME;
D O I
10.1016/j.hedp.2014.11.006
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
We have conducted radiation magneto-hydrodynamics (RMHD) simulations of Richtmyer-Meshkov instability (RMI) in a magnetized counter flow produced by intense lasers. A jet-like plasma from a planar plastic target is formed and maintained in several-tens of nanoseconds by expanding plasma from rear side of two separated laser spots, and parallelly located another target is ablated by the radiation from the plasma, reproducing past experimental works. A planar shock driven by the radiation interacts with the jet as a nonuniform density structure, resulting in the RMI. The magnetic field is amplified up to similar to 40 times greater than the background value at the interface at which the instability occurs. However, a certain extent of the amplification results from the compression effect induced by the counter flow, and the obtained amplification level is difficult to be measured in the experiments. An experiment for observing a clear amplification must be designed through the RMHD simulations so that the RMI takes place in the low-density area between two targets. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:18 / 23
页数:6
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