Time-dependent measurement of high-power laser light reflection by low-Z foam plasma
Time-dependent measurement of high-power laser light reflection by low-Z foam plasma
复制标题
低 Z 泡沫等离子体对高功率激光反射的时间依赖性测量
DOI：
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发表时间：
2021
影响因子：
4.8
通讯作者：
M. Salvadori
中科院分区：
文献类型：
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作者：
M. Cipriani;S. Gus’kov;F. Consoli;R. De Angelis;A. Rupasov;P. Andreoli;G. Cristofari;G. Di Giorgio;M. Salvadori
摘要 多孔材料在与惯性约束聚变相关的激光-物质相互作用实验中具有许多应用。获得有关激光产生的多孔介质等离子体特性的新知识是一项具有挑战性的任务。在这项工作中，我们据我们所知首次报告了对超临界密度低Z泡沫材料激光产生的等离子体的太瓦激光脉冲的反射光的时间依赖性测量。实验是用 ABC 激光器进行的，目标由超临界密度的泡沫和相同化学成分的固体介质构成。我们在 MULTI-FM 代码中实现了光反射模型，以再现和解释实验结果。通过将模拟与实验结果结合起来，我们提出了估计激光产生的等离子体的均匀化时间的标准，其测量对于直接诊断技术来说具有挑战性，并且尚未实现。
Abstract Porous materials have many applications for laser–matter interaction experiments related to inertial confinement fusion. Obtaining new knowledge about the properties of the laser-produced plasma of porous media is a challenging task. In this work, we report, for the first time to the best of our knowledge, the time-dependent measurement of the reflected light of a terawatt laser pulse from the laser-produced plasma of low-Z foam material of overcritical density. The experiments have been performed with the ABC laser, with targets constituted by foam of overcritical density and by solid media of the same chemical composition. We implemented in the MULTI-FM code a model for the light reflection to reproduce and interpret the experimental results. Using the simulations together with the experimental results, we indicate a criterion for estimating the homogenization time of the laser-produced plasma, whose measurement is challenging with direct diagnostic techniques and still not achieved.