University of Huddersfield Repository Generation of Warm Dense Matter using an Argon based Capillary Discharge Laser
University of Huddersfield Repository Generation of Warm Dense Matter using an Argon based Capillary Discharge Laser
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哈德斯菲尔德大学存储库使用基于氩的毛细管放电激光器生成热致密物质
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发表时间：
2021
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通讯作者：
G. Tallents
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作者：
A. Rossall;G. Tallents
基于氩的毛细管放电激光器在 46.9 nm 极紫外 (EUV) 下工作，每脉冲输出高达 0.5 mJ 能量，重复率高达 10 Hz，能够实现 10 9 - 10 12 W cm − 2 的聚焦辐照度，可用于通过照射固体材料在温暖的致密物质区域产生等离子体。为了模拟这种 EUV 激光器和固体材料之间的相互作用，二维辐射流体动力学代码 POLLUX 已被修改为包括通过直接光电离的吸收、描述电离相关电子配置的超配置模型以及用于入射 EUV 激光辐射光线追踪的等离子体折射率的计算。提出了一项模拟研究，展示了如何使用 1200 ps 脉冲持续时间的毛细管放电激光器来产生接近固体密度的温暖致密物质，温度为几个 eV，能量密度高达 1 × 10 5 J cm - 3 。由 EUV 激光照射产生的等离子体被证明可用于检查热致密物质的特性，例如，等离子体发射不会像可见光/红外激光目标照射时那样被更热、密度较低的等离子体发射所掩盖。
Argon based capillary discharge lasers operating in the extreme ultra violet (EUV) at 46.9 nm output up to 0.5 mJ energy per pulse at up to 10 Hz repe-tition rates are capable of focussed irradiances of 10 9 - 10 12 W cm − 2 and can be used to generate plasma in the warm dense matter regime by irradiating solid material. To model the interaction between such an EUV laser and solid material, the 2D radiative-hydrodynamic code POLLUX has been modified to include absorption via direct photo-ionisation, a super-configuration model to describe the ionisation dependant electronic configurations and a calculation of plasma refractive indices for ray tracing of the incident EUV laser radiation. A simulation study is presented, demonstrating how capillary discharge lasers of 1200 ps pulse duration can be used to generate warm dense matter at close to solid densities with temperatures of a few eV and energy densities up to 1 × 10 5 J cm − 3 . Plasmas produced by EUV laser irradiation are shown to be useful for examining the properties of warm dense matter as, for example, plasma emission is not masked by hotter, less dense plasma emission as occurs with visible/infra-red laser target irradiation.