Electron-Density Scaling of Conversion Efficiency of Laser Energy into L-shell X-rays

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Laser-produced plasmas at subcritical densities have proven to be efficient sources for x-ray production. In this context, they obtain new results from experiments performed in Kr and Xe gas-filled targets that were irradiated by the high-power OMEGA (Laboratory for Laser Energetics, University of Rochester) laser. Nearly 40% of the laser energy was converted into x-rays in the L-shell-photon-energy range ({ge} 1.6 keV) by a Kr-filled target. The conversion efficiency measurements were correlated with time-resolved plasma-temperature measurements done by means of a Thomson-scattering diagnostic. The measured range of temperatures, between 2-3.5 keV, is in good agreement with LASNEX radiation-hydrodynamics simulations. X-ray-cooling ... continued below

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Fournier, K B; Constantin, C; Back, C A; Suter, L; Chung, H; Miller, M C et al. January 10, 2005.

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Laser-produced plasmas at subcritical densities have proven to be efficient sources for x-ray production. In this context, they obtain new results from experiments performed in Kr and Xe gas-filled targets that were irradiated by the high-power OMEGA (Laboratory for Laser Energetics, University of Rochester) laser. Nearly 40% of the laser energy was converted into x-rays in the L-shell-photon-energy range ({ge} 1.6 keV) by a Kr-filled target. The conversion efficiency measurements were correlated with time-resolved plasma-temperature measurements done by means of a Thomson-scattering diagnostic. The measured range of temperatures, between 2-3.5 keV, is in good agreement with LASNEX radiation-hydrodynamics simulations. X-ray-cooling rates and charge-state distributions were computed using detailed atomic data from the HULLAC suite of codes. X-ray yields predicted by the cooling-rate calculations are compared to measured spectra, and good agreement is found for predictions made with highly-detailed atomic models. They find that x-ray conversion efficiency in Kr-filled targets is a strong function of temperature, and has an optimum density near 10-15% of the laser's critical density.

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PDF-file: 18 pages; size: 1.8 Mbytes

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  • Journal Name: Journal of Quantitative Spectroscopy and Radiative Transfer; Journal Volume: 99; Journal Issue: 1-3

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  • Report No.: UCRL-JRNL-209373
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 877909
  • Archival Resource Key: ark:/67531/metadc874321

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 10, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 5, 2016, 2:48 p.m.

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Fournier, K B; Constantin, C; Back, C A; Suter, L; Chung, H; Miller, M C et al. Electron-Density Scaling of Conversion Efficiency of Laser Energy into L-shell X-rays, article, January 10, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc874321/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.