Influence of the Focus Position on Preplasma Formation and Ion Acceleration in Laser Irradiation of a Flat Target

IF 1.4 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2025-05-12 DOI:10.1134/S002136402560020X

K. V. Safronov, A. V. Brantov, V. A. Flegentov, N. N. Shamaeva, S. A. Gorokhov, A. S. Tishchenko, D. O. Zamuraev, N. A. Fedorov, S. F. Kovaleva, A. L. Shamraev, S. I. Glazyrin, M. A. Rakitina, V. Yu. Bychenkov

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Abstract

It has been demonstrated experimentally and in the theoretical calculation that the energy of protons accelerated by a 60-TW femtosecond laser pulse can be increased by choosing the optimal position of the focus spot relative to the surface of the irradiated target at a given nanosecond pedestal due to amplified spontaneous emission. This position is determined as the best focusing option that ensures a sufficiently efficient matching of incident and preplasma-trapped laser radiation under the conditions of emerging self-consistent spatial profiles of the preplasma and crater (i.e., the remaining thickness of the target) on the irradiated surface. At the same time, the focal spot does not lie on the surface of the target, but is shifted into the preplasma, which makes it possible to raise the maximum proton energy by a factor of 1.5.

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激光照射平面靶时焦点位置对预等离子体形成和离子加速的影响

实验和理论计算表明，在给定的纳秒基础上，通过选择聚焦光斑相对于被照射目标表面的最佳位置，可以提高60 tw飞秒激光脉冲加速的质子能量。在预等离子体和弹坑（即目标的剩余厚度）在辐照表面上出现自一致的空间轮廓的条件下，该位置被确定为确保入射和预等离子体捕获激光辐射足够有效匹配的最佳聚焦选择。同时，焦点光斑不位于靶体表面，而是被转移到预等离子体中，这使得最大质子能量提高1.5倍成为可能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.