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The PALS iodine laser-driven jets

机译：PALS碘激光驱动射流

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摘要

Investigations of plasma jets produced by the action of a defocused laser beam on planar metallic targets and the interaction of supersonic plasma jets with dense gases (He at d Ar) are presented. The experiment was carried out at the iodine laser facility (Prague Asterix Laser System (PALS)) using the third harmonic of laser radiation (0.438 mu m) with a pulse duration of 250 ps (FWHM). In order to optimize the plasma jet parameters, the laser beam energy and the focal spot radius were changed in the ranges of 13-160 J and 35-600 mu m, respectively. Besides, the focal point was located both before and inside the targets. The study was performed with the use of target materials of different mass densities (Cu, Ag and Ta). Finally, the optimized Cu plasma jets were used for shock wave generation in ambient gases of different pressures. Information about the geometry of plasma expansion, plasma dynamics and electron density distributions was obtained by means of a 3-frame laser interferometric system. Additionally, a Photonic Science PE7051 x-ray pinhole camera and the crater replica method for the reconstruction of crater parameters were used. Our experiment has shown that the plasma jet forming is a fundamental process which accompanies the expansion of the laser plasma produced by irradiating a massive planar target, made of a material of a relatively high atomic number, with a partly defocused laser beam. One can suppose that there are no laser energy limitations for the plasma jet creation. Illustrations of applications of such plasma jets for astrophysical and inertial confinement fusion investigations are also presented.
机译：提出了对由散焦激光束作用在平面金属靶上产生的等离子体射流以及超音速等离子体射流与致密气体（He在d Ar处）的相互作用的研究。该实验是在碘激光设备（布拉格Asterix激光系统（PALS））上使用激光辐射的三次谐波（0.438μm），脉冲持续时间为250 ps（FWHM）进行的。为了优化等离子体射流参数，分别在13-160 J和35-600μm的范围内改变激光束能量和焦点半径。此外，联络点位于目标之前和内部。使用不同质量密度（铜，银和钽）的靶材进行了研究。最后，将优化的铜等离子体射流用于在不同压力的环境气体中产生冲击波。关于等离子体膨胀的几何形状，等离子体动力学和电子密度分布的信息是通过3帧激光干涉系统获得的。另外，使用了Photonic Sc​​ience PE7051 X射线针孔照相机和陨石坑复制方法来重建陨石坑参数。我们的实验表明，等离子体射流形成是一个基本过程，伴随着通过用散焦的激光束照射由原子量较高的材料制成的大块平面靶所产生的激光等离子体的膨胀。可以假设等离子体射流的产生没有激光能量限制。还介绍了此类等离子体射流在天体物理和惯性约束聚变研究中的应用实例。

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