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Title: Enhanced x-ray emissions from Au-Gd mixture targets ablated by a high-power nanosecond laser

As an important x-ray source, enhancement of x-ray emissions from laser-produced plasmas is imperative for various applications. High-Z Au-Gd mixture targets are proposed to enhance the laser to x-ray conversion efficiency compared to pure Au target. In the experiments, a 1 ns frequency-tripled (351 nm wavelength) laser light was used to obtain an intensity of 3×10{sup 14} W/cm{sup 2} on the targets. The x-ray spectra, total absolute x-ray emissions of all space, M-band fraction and backscattering from pure Au and Au-Gd mixture have been measured, respectively. It is shown that the absolute laser to x-ray conversion efficiency for the Au-Gd mixture containing 60% gold by atom is 47.7%, which has a 15% enhancement compared with that of the pure Au target. The experimental results are consistent with the radiation hydrodynamic simulations.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ; ; ;  [1] ;  [3]
  1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900 (China)
  2. (China)
  3. Department of Engineering Physics, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22275644
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BACKSCATTERING; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; GADOLINIUM; GOLD; LASER RADIATION; LASER TARGETS; LASER-PRODUCED PLASMA; PHOTON EMISSION; PLASMA SIMULATION; SOLID STATE LASERS; X RADIATION; X-RAY SOURCES; X-RAY SPECTRA