Physics – General Physics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980phrva..21.1316s&link_type=abstract
Physical Review A - General Physics, 3rd Series, vol. 21, Apr. 1980, p. 1316-1326. Research supported by the Exxon Research and
Physics
General Physics
63
Dense Plasmas, Laser Fusion, Laser Plasma Interactions, Laser Plasmas, Plasma Diagnostics, Plasma Spectra, X Ray Spectroscopy, Laser Targets, Line Spectra, Lyman Spectra, Plasma Potentials, Poisson Equation, Quantum Mechanics
Scientific paper
The frequency shift of X-ray spectral lines has been theoretically studied for possible application as a density diagnostic in high-compression laser-fusion experiments. Neon was found to have line-shift characteristics ideal for near-term experiments and could be used as a diagnostic seed material for the fuel. At densities above about 4g/cu cm, the shift of neon Lyman alpha was found to be roughly proportional to density. The calculations were done by solving the Schroedinger equation for energy levels, in a self-consistent potential determined by the nonlinear Poisson equation for electrons and neighboring ions. The computer simulation of a possible laser-compression experiment was used to calculate the line spectrum that might be seen in the laboratory and to illustrate how the shift could be used to estimate density. This diagnostic was found to be applicable only when the average charge of target materials was less than about 6; i.e., it is applicable to plastic microballoons but not to glass.
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