Angular distribution and conversion of multi-keV L-shell X-ray sources produced from nanosecond laser irradiated thick-foil targets

被引：17
|
作者：
Hu, G. -Y. [1 ,2 ,3 ]
Zhang, J. -Y. [2 ]
Zheng, J. [3 ]
Shen, B. -F. [1 ]
Liu, S. -Y. [2 ]
Yang, J. -M. [2 ]
Ding, Y. -K. [2 ]
Hu, X. [2 ]
Huang, Y. -X. [2 ]
Du, H. -B. [2 ]
Yi, R. -Q. [2 ]
Lei, A. -L. [1 ]
Xu, Z. -Z. [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China
[2] CAEP, Res Ctr Laser Fus, Mianyang, Peoples R China
[3] Univ Sci & Technol China, Dept Modern Phys, CAS Key Lab Basic Plasma Phys, Hefei 230026, Peoples R China
来源：
LASER AND PARTICLE BEAMS | 2008年 / 26卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Angular distribution; Laser plasma; X-ray source;
D O I：
10.1017/S0263034608000682
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
An experimental study on the angular distribution and conversion of multi-keV X-ray sources produced from 2 ns-duration 527nm laser irradiated thick-foil targets on Shenguang II laser facility (SG-II) is reported. The angular distributions measured in front of the targets can be fitted with the function of f(theta) = alpha+ (1- alpha)cos(beta) theta (theta is the viewing angle relative to the target normal), where alpha = 0.41 +/- 0.014, beta = 0.77 +/- 0.04 for Ti K-shell X-ray Sources (similar to 4.75 keV for Ti K-shell), and alpha = 0.085 +/- 0.06, beta = 0.59 +/- 0.07 for Ag/Pd/Mo L-shell X-ray Sources (2-2.8 keV for Mo L-shell, 2.8-3.5 keV for Pd L-shell, and 3-3.8 keV for Ag L-shell). The isotropy of the angular-distribution of L-shell emission is worse than that of the K-shell emission at larger viewing angle (>70 degrees), due to its larger optical depth (stronger self-absorption) in the cold plasma side lobe Surrounding the central emission region, and in the central hot plasma region (emission region). There is no observable difference in the angular distributions of the L-shell X-ray emission among Ag, Pd, and Mo. The conversion efficiency of Ag/Pd/Mo L-shell X-ray sources is higher than that of the Ti K-shell X-ray sources, but the gain relative to the K-shell emission is not as high as that by using short pulse lasers. The conversion efficiency of the L-shell X-ray sources decrease, with increasing atomic numbers (or X-ray photon energy), similar to the behavior of the K-shell X-ray Source.
引用
收藏
页码：661 / 670
页数：10
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