keV x‐ray production using 50 mJ KrF laser produced plasmas at 1 and 100 ps
keV x‐ray production using 50 mJ KrF laser produced plasmas at 1 and 100 ps
复制标题
使用 50 mJ KrF 激光产生 1 和 100 ps 等离子体的 keV X 射线
DOI：
10.1063/1.354518
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发表时间：
1993
影响因子：
3.2
通讯作者：
R. Fedosejevs
中科院分区：
文献类型：
--
作者：
J. Broughton;R. Fedosejevs
用不同的金属靶研究了KrF放电激光脉冲产生的800-1400 eV x射线的发射，脉冲宽度为1~100ps，能量高达50mJ。在真空中测量了2π锶的发射光谱、角分布和X射线转换效率。当脉冲功率为90ps，50mJ时，铁、钴、镍、铜和锌的峰值转换效率为10%-13%。2ps，40mJ的脉冲产生了8%-10%的转换效率，其中等离子体反射率是转换效率降低的原因。在850ps，35mJ的脉冲下，铜的产额降低了4%。在氦气为1atm的背景气体中，观察到90ps脉冲的转换效率降低了15%。
The emission of 800–1400 eV x rays from plasmas produced by KrF discharge laser pulses with durations in the range of 1 and 100 ps with energies up to 50 mJ has been studied using various metal targets. The emission spectra, angular distribution, and x‐ray conversion efficiencies into 2π Sr have been measured in vacuum. Peak conversion efficiencies of 10%–13% were obtained for Fe, Co, Ni, Cu, and Zn when a 90 ps, 50 mJ pulse was used. A 2 ps, 40 mJ pulse yielded efficiencies of 8%–10% with plasma reflectivity accounting for the reduction in conversion efficiency. An 850 fs, 35 mJ pulse gave reduced yields of 4% for Cu. In a background gas of 1 atm helium a reduction of conversion efficiency by 15% was observed for 90 ps pulses.