KrF laser-driven shock tube: Realization and first experiments

Fundamental Plasma Physics Pub Date : 2024-03-28 DOI:10.1016/j.fpp.2024.100046

V.D. Zvorykin, P.V. Veliev, I.A. Kozin, N.V. Morozov, E.V. Parkevich, K.T. Smaznova, N.N. Ustinovskii, A.V. Shutov

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Abstract

We report on the first implementation of a miniature laser-driven shock tube (LDST) of 5 × 5 mm cross section and 50-mm length for generating and studying strong shock waves (SW) and hypersonic gas flows with M > 10. Operation of the LDST is based on the acceleration of a thin CH-film by ablative plasma pressure produced when the film is irradiated by high-energy UV pulse of the GARPUN KrF laser (100 J & 100-ns). The film serves as a piston that pushes a SW in the gas filling the LDST. An optical system based on a multi-element prism raster provides focusing of KrF laser beam into 7 × 7 mm square spot with 100 J/cm² energy fluence (1 GW/cm² intensity) with inhomogeneity ∼3 % across the LDST aperture. It is expected that the LDST with KrF laser driver can be an effective tool for studying hydrodynamic phenomena, such as hydrodynamic instabilities and transition to a turbulence, hypersonic gas flow around bodies, reflection and cumulation of strong SW.

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KrF 激光驱动冲击管：实现和首次实验

我们首次报道了一种横截面为 5 × 5 毫米、长度为 50 毫米的微型激光驱动冲击管（LDST），用于产生和研究强冲击波（SW）以及 M > 10 的高超音速气体流。 LDST 的运行基于薄膜 CH 膜在 GARPUN KrF 激光高能紫外脉冲（100 J & 100-ns）照射下产生的烧蚀等离子压力的加速。薄膜就像一个活塞，推动着充入 LDST 气体中的 SW。基于多元素棱镜光栅的光学系统可将 KrF 激光束聚焦到 7 × 7 mm 的正方形光斑中，能量通量为 100 J/cm2（强度为 1 GW/cm2），整个 LDST 孔径的不均匀性为 ∼ 3 %。预计带有 KrF 激光驱动器的 LDST 可以成为研究流体力学现象的有效工具，例如流体力学不稳定性和向湍流的过渡、物体周围的高超音速气体流动、强 SW 的反射和累积。

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Fundamental Plasma Physics

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