Monochromatic 2D Kα Emission Images Revealing Short-Pulse Laser Isochoric Heating Mechanism.
Monochromatic 2D Kα Emission Images Revealing Short-Pulse Laser Isochoric Heating Mechanism.
复制标题
单色 2D Kα 发射图像揭示了短脉冲激光等容加热机制。
作者：
H. Sawada;Y. Sentoku;T. Yabuuchi;U. Zastrau;E. Förster;F. Beg;H. Chen;A. Kemp;H. McLean;P. Patel;Y. Ping
利用二维窄带 X 射线成像和 X 射线光谱研究了高强度亚皮秒激光对薄钛箔的快速加热。使用调谐至 4.51 keV Ti Kα 的新型单色成像诊断成功地可视化了固体密度等离子体的显着电离区域 (⟨Z⟩>17±1)，该区域位于横向直径为 ∼35 μm 的点内，深度为 2 μm。测量和二维碰撞颗粒细胞模拟表明，在强激光对固体箔进行快速等容加热时，固体钛中如此高的电离态是通过脉冲结束后几皮秒内热前等离子体的热扩散实现的。 Kα 的移动和缺失 Kα 的形成无法用现有的原子物理模型来解释。仅当包含阈值电离为 ⟨Z⟩=17 的 Kα 位移唯象模型时，才会再现测量的 Kα 图像。这项工作揭示了等容加热非平衡等离子体的电离态和电子温度如何独立增加。
The rapid heating of a thin titanium foil by a high intensity, subpicosecond laser is studied by using a 2D narrow-band x-ray imaging and x-ray spectroscopy. A novel monochromatic imaging diagnostic tuned to 4.51 keV Ti Kα was used to successfully visualize a significantly ionized area (⟨Z⟩>17±1) of the solid density plasma to be within a ∼35 μm diameter spot in the transverse direction and 2 μm in depth. The measurements and a 2D collisional particle-in-cell simulation reveal that, in the fast isochoric heating of solid foil by an intense laser light, such a high ionization state in solid titanium is achieved by thermal diffusion from the hot preplasma in a few picoseconds after the pulse ends. The shift of Kα and formation of a missing Kα cannot be explained with the present atomic physics model. The measured Kα image is reproduced only when a phenomenological model for the Kα shift with a threshold ionization of ⟨Z⟩=17 is included. This work reveals how the ionization state and electron temperature of the isochorically heated nonequilibrium plasma are independently increased.
影响因子：
2.2
作者：
P. Neumayer;B. Aurand;R. A. Costa Fraga;B. Ecker;R. E. Grisenti;A. Gumberidze;D. C. Hochhaus;A. Kalinin;M. C. Kaluza;T. Kühl;J. Polz;R. Reuschl;T. Stöhlker;D. Winters;N. Winters;Z. Yin
通讯作者：
Z. Yin
影响因子：
2.1
作者：
Schulz, Wolfgang;Eppelt, Urs;Poprawe, Reinhart
通讯作者：
Poprawe, Reinhart
观察拍瓦激光加热在固体中发射的极强冲击波
影响因子：
2.2
作者：
Lancaster K
通讯作者：
Lancaster K