Laser astrophysics experiment on the amplification of magnetic fields by shock-induced interfacial instabilities,Physical Review E

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Laser astrophysics experiment on the amplification of magnetic fields by shock-induced interfacial instabilities
Physical Review E ( IF 2.2 ) Pub Date : 2021-09-17 , DOI: 10.1103/physreve.104.035206
Takayoshi Sano ₁ , Shohei Tamatani ₁ , Kazuki Matsuo ₁ , King Fai Farley Law _{1,

2} , Taichi Morita ₃ , Shunsuke Egashira ₁ , Masato Ota ₁ , Rajesh Kumar ₁ , Hiroshi Shimogawara ₁ , Yukiko Hara ₁ , Seungho Lee ₁ , Shohei Sakata _{1,

4} , Gabriel Rigon _{5,

6} , Thibault Michel ₅ , Paul Mabey ₅ , Bruno Albertazzi ₅ , Michel Koenig _{5,

7} , Alexis Casner _{8,

9} , Keisuke Shigemori ₁ , Shinsuke Fujioka ₁ , Masakatsu Murakami ₁ , Youichi Sakawa ₁

Affiliation

Laser experiments are becoming established as tools for astronomical research that complement observations and theoretical modeling. Localized strong magnetic fields have been observed at a shock front of supernova explosions. Experimental confirmation and identification of the physical mechanism for this observation are of great importance in understanding the evolution of the interstellar medium. However, it has been challenging to treat the interaction between hydrodynamic instabilities and an ambient magnetic field in the laboratory. Here, we developed an experimental platform to examine magnetized Richtmyer-Meshkov instability (RMI). The measured growth velocity was consistent with the linear theory, and the magnetic-field amplification was correlated with RMI growth. Our experiment validated the turbulent amplification of magnetic fields associated with the shock-induced interfacial instability in astrophysical conditions. Experimental elucidation of fundamental processes in magnetized plasmas is generally essential in various situations such as fusion plasmas and planetary sciences.

中文翻译：

激波诱导界面不稳定性放大磁场的激光天体物理实验

激光实验正逐渐成为天文研究的工具，补充观测和理论建模。在超新星爆炸的激波前沿已经观察到局部强磁场。对这一观测物理机制的实验确认和鉴定对于理解星际介质的演化具有重要意义。然而，在实验室中处理流体动力学不稳定性与环境磁场之间的相互作用一直具有挑战性。在这里，我们开发了一个实验平台来检查磁化 Richtmyer-Meshkov 不稳定性 (RMI)。测得的生长速度与线性理论一致，磁场放大与 RMI 生长相关。我们的实验验证了与天体物理条件下冲击引起的界面不稳定性相关的磁场的湍流放大。在诸如聚变等离子体和行星科学等各种情况下，磁化等离子体基本过程的实验阐明通常是必不可少的。

更新日期：2021-09-17

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