Water-window x-ray emission from laser-produced Au plasma under optimal target thickness and focus conditions

被引：3

作者：

Wang, Jiahao ^{[1
]}

Kishimoto, Maki ^{[1
]}

Jozaki, Tomoyuki ^{[1
,2
]}

Kumeda, Tomohiro ^{[1
]}

Higashiguchi, Takeshi ^{[3
]}

Sunahara, Atsushi ^{[2
,4
]}

Ohiro, Hikari ^{[1
]}

Yamasaki, Kotaro ^{[1
]}

Namba, Shinichi ^{[1
]}

机构：

[1] Hiroshima Univ, Dept Adv Sci & Engn, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 7398527, Japan

[2] Osaka Univ, Inst Laser Engn, 2-6 Yamadaoka, Suita, Osaka 5650871, Japan

[3] Utsunomiya Univ, Dept Elect & Elect Engn, 350 Minemachi, Utsunomiya, Tochigi 3218505, Japan

[4] Purdue Univ, Ctr Mat Extreme Environm, 610 Purdue Mall, W Lafayette, IN 47907 USA

来源：

PHYSICAL REVIEW E | 2023年 / 107卷 / 06期

关键词：

SPATIAL-RESOLUTION; MICROSCOPY; ABSORPTION; ENHANCEMENT;

D O I：

10.1103/PhysRevE.107.065211

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Optimal laser irradiation conditions for water-window (WW) x-ray emission (2.3-4.4 nm) from an Au plasma are investigated to develop a laboratory-scale WW x-ray source. A minimum Au target thickness of 1 mu m is obtained for a laser intensity of 1013 W/cm2 by observing the intensity drop in the WW spectra. Au targets produced by thermal evaporation are found to have a higher conversion efficiency than commercial foil targets for WW x-ray radiation. In addition, optimal laser spots for fixed laser energies (240 and 650 mJ) are found for an Au target 1 mm in front of the focal point, where suitable conditions for plasma temperature and plume volume coupling are achieved. The mechanism of the optimal target thickness and spot size can be well explained using a radiation hydrodynamic simulation code.

引用

页数：11

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