Average atom and detailed configuration accounting calculations of bremsstrahlung in aluminum plasmas

Details Average atom and detailed configuration accounting calculations of bremsstrahlung in aluminum plasmas Average atom and detailed configuration accounting calculations of bremsstrahlung in aluminum plasmas

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jqsrt..45..105b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 45, Feb. 1991, p. 105-114.

Other

Aluminum, Bremsstrahlung, Dense Plasmas, Electron Energy, High Temperature Plasmas, Metallic Plasmas, Plasma Radiation, Ion Scattering, Kinetic Energy, Thermodynamic Equilibrium

Scientific paper

Sample bremsstrahlung spectra emitted from continuum electrons of specific kinetic energy in hot, dense aluminum plasmas were calculated, using three different theoretical approaches for modeling the scattering from ions in these environments. A Thomas-Fermi average atom approach (TFAA), a nonlocal thermodynamic equilibrium average atom approach (NLTEAA), and a detailed configuration accounting approach (DCA) are considered. The calculations were done for a plasma temperature of 500 eV and for plasma densities of 10 to the 20th and 10 to the 23rd ions/cu cm. Results for isolated neutral atoms and nearly stripped isolated ions are presented for comparison. The calculations were performed for incident electrons kinetic energies of 100 and 500 eV and 1 and 10 keV. In the low-density case, the TFAA approach gives somewhat different results from the DCA and NLTEAA approaches, reflecting corresponding differences in the potentials. In this case, comparisons of bremsstrahlung cross sections for nearly stripped isolated ions with corresponding plasma results showed better agreement than comparisons between the plasma approaches. In the high-density case, the two average-atom approaches show good agreement with each other and with the DCA approach, reflecting greater similarity among the potentials.

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