目标电流:表征激光-物质相互作用动力学的适当参数

J. Krása, D. Klír, K. Rezac, J. Cikhardt, A. Velyhan, M. Pfeifer, J. Dostál, M. Krůs, R. Dudzak, S. Buryšková, V. Nassisi, D. Delle Side
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引用次数: 1

摘要

利用电阻式靶探针,通过观察返回电流来中和电子离开等离子体所引起的目标正电荷,从而获得激光与物质相互作用的独特动力学特性。实验结果表明,在108 Wcm-2的焦点处,激光产生的等离子体有三个阶段,即等离子体点火阶段、活跃阶段和余辉阶段。然后,在较高的强度下,前两相强烈占主导地位,目标电流达到10 kA的值。定义了最快电子离开等离子体时的等离子体势垒通量,并通过实验估计了其值。我们还提供了关键的实验证明,在整个强度范围内,电荷在目标上的持续时间远远长于激光-等离子体相互作用的持续时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Target current: an appropriate parameter for characterizing the dynamics of laser-matter interaction
A resistive target probes were employed to obtain unique characteristics of the dynamic of the laser-matter interaction through the observation of a return current neutralizing the positive target charge caused by electrons definitely leaving the plasma. Experimental observations show that three phases of the laser-produced plasma are well recognized, i.e. the plasma ignition phase, active plasma phase, and afterglow phase already for the lowest laser intensity at the focal point of 108 Wcm-2 . Then, at higher intensities the first two phases strongly dominate and the target current reaches a value of 10 kA. A throughput of plasma barrier for the fastest electrons leaving the plasma is defined, and its value is experimentally estimated. We also present key experiments proving that the duration of the electrical charge on the target is much longer than the duration of the laser-plasma interaction for the entire intensity range.
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