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

Published online by Cambridge University Press:  12 December 2008

G.-Y. Hu ,
J.-Y. Zhang ,
J. Zheng ,
B.-F. Shen ,
S.-Y. Liu ,
J.-M. Yang ,
Y.-K. Ding ,
X. Hu ,
Y.-X. Huang  and
H.-B. Du
...Show all authors
G.-Y. Hu*
Affiliation:
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, China Research Center of Laser Fusion, CAEP, Mianyang, China CAS Key Laboratory of Basic Plasma Physics, Department of Modern Physics, University of Science and Technology of China, Hefei, China
J.-Y. Zhang
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
J. Zheng
Affiliation:
CAS Key Laboratory of Basic Plasma Physics, Department of Modern Physics, University of Science and Technology of China, Hefei, China
B.-F. Shen
Affiliation:
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, China
S.-Y. Liu
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
J.-M. Yang
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
Y.-K. Ding
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
X. Hu
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
Y.-X. Huang
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
H.-B. Du
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
R.-Q. Yi
Affiliation:
Research Center of Laser Fusion, CAEP, Mianyang, China
A.-L. Lei
Affiliation:
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, China
Z.-Z. Xu
Affiliation:
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, China
*
Address correspondence and reprint requests to: G.Y. Hu, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai 201800, China. E-mail: gyhu@siom.ac.cn
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Abstract

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(θ) = α+ (1−α)cosβθ (θ is the viewing angle relative to the target normal), where α = 0.41 ± 0.014, β = 0.77 ± 0.04 for Ti K-shell X-ray sources (~4.75 keV for Ti K-shell), and α = 0.085 ± 0.06, β = 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°), 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 decreases with increasing atomic numbers (or X-ray photon energy), similar to the behavior of the K-shell X-ray source.

Keywords

Angular distributionLaser plasmaX-ray source
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 4 , December 2008 , pp. 661 - 670
Copyright
Copyright © Cambridge University Press 2008

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