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

  • G.-Y. Hu (a1) (a2) (a3), J.-Y. Zhang (a2), J. Zheng (a3), B.-F. Shen (a1), S.-Y. Liu (a2), J.-M. Yang (a2), Y.-K. Ding (a2), X. Hu (a2), Y.-X. Huang (a2), H.-B. Du (a2), R.-Q. Yi (a2), A.-L. Lei (a1) and Z.-Z. Xu (a1)...

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.

Copyright

Corresponding author

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

References

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Keywords

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

  • G.-Y. Hu (a1) (a2) (a3), J.-Y. Zhang (a2), J. Zheng (a3), B.-F. Shen (a1), S.-Y. Liu (a2), J.-M. Yang (a2), Y.-K. Ding (a2), X. Hu (a2), Y.-X. Huang (a2), H.-B. Du (a2), R.-Q. Yi (a2), A.-L. Lei (a1) and Z.-Z. Xu (a1)...

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