Prepulse and amplified spontaneous emission effects on the interaction of a petawatt class laser with thin solid targets
Prepulse and amplified spontaneous emission effects on the interaction of a petawatt class laser with thin solid targets
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DOI：
10.1016/j.nima.2014.01.056
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发表时间：
2014-05-01
影响因子：
1.4
通讯作者：
Bulanov, Sergei V.
中科院分区：
文献类型：
--
作者：
Esirkepov, Timur Zh.;Koga, James K.;Bulanov, Sergei V.
当有限对比度的拍瓦激光脉冲照射微米厚的箔时，（包括放大的自发辐射）产生一个预等离子体，其中超短相对论强激光脉冲的一部分（主脉冲）由于相对论自聚焦而获得更高的强度，并且经历快速耗尽，将能量转移到快速电子。如果预等离子体厚度是最佳的，主脉冲可以比理想的、无限对比度的激光脉冲更有效地到达加速快离子的目标。建立了一个简单的预等离子体靶的解析模型，并预测了该靶中离子的辐射压加速。用耗散流体力学模拟方法分析了纳秒级预脉冲作用下预等离子体的形成过程。采用多参数粒子模拟方法研究了主脉冲与预等离子体的相互作用。数百兆电子伏离子加速的最佳条件被发现与诊断，包括高次谐波产生重要的伴随效应。(C)2014爱思唯尔有限公司版权所有。
When a finite contrast petawatt laser pulse irradiates a micron-thick foil, a prepulse (including amplified spontaneous emission) creates a preplasma, where an ultrashort relativistically strong portion of the laser pulse (the main pulse) acquires higher intensity due to relativistic self-focusing and undergoes fast depletion transferring energy to fast electrons, If the preplasma thickness is optimal, the main pulse can reach the target accelerating fast ions more efficiently than an ideal, infinite contrast, laser pulse. A simple analytical model of a target with preplasma formation is developed and the radiation pressure dominant acceleration of ions in this target is predicted. The preplasma formation by a nanosecond prepulse is analyzed with dissipative hydrodynamic simulations. The main pulse interaction with the preplasma is studied with multi-parametric particle-in-cell simulations. The optimal conditions for hundreds of MeV ion acceleration are found with accompanying effects important for diagnostics, including high-order harmonics generation. (C) 2014 Elsevier B.V. All rights reserved.