Two-dimensional shock propagation and Mach stem formation induced by a laser-produced annular plasma

被引：0

作者：

Veloso, Felipe ^{[1
,2
]}

Rosales, Vicente ^{[1
]}

Favre, Mario ^{[1
,2
]}

Valenzuela, Julio ^{[1
]}

机构：

[1] Pontificia Univ Catolica Chile, Inst Fis, Santiago 7820436, Chile

[2] Pontificia Univ Catolica Chile, Ctr Invest Nanotecnol & Mat Avanzados CIEN UC, Santiago 7820436, Chile

来源：

PHYSICAL REVIEW E | 2024年 / 110卷 / 06期

关键词：

SPECTROSCOPY; WAVES;

D O I：

10.1103/PhysRevE.110.065210

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 experimentally studied the formation of shock waves in a laser-induced annular configuration. By locating an aluminum target in the focal plane of a 109 W/cm2 laser, an annular plasma is formed that acts as a piston for a shock wave in a background gas composed by either argon or nitrogen. According to shock wave dynamics, the annular shock follows a two-dimensional propagation profile that is attributed to the boundary conditions of the piston. In addition, we observe the formation of a Mach stem at the center of the configuration, at a position and timing predictable by the adiabatic index of the background gas and shock wave profile. This controlled laboratory setting for producing Mach stems can be used as a benchmark platform for testing conjectures on the observations of clumpy features in astrophysical objects. Moreover, the observed Mach stem propagates as a one-dimensional shock wave given the boundary conditions imposed by the annular configuration.

引用

页数：10

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