The inverse bremsstrahlung absorption coefficient in collisional plasmas

A prescription for the inverse bremsstrahlung (IB) absorption coefficient is presented. The coefficient is derived in terms of a collision frequency that is found from a memory function kinetic formalism. The formalism admits limits that allow a rigorous definition of the coefficient when the plasma...

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Bibliographic Details
Published in:The Physics of fluids (1958) 1985-11, Vol.28 (11), p.3387-3392
Main Authors: Cauble, R., Rozmus, W.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma properties
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Summary:A prescription for the inverse bremsstrahlung (IB) absorption coefficient is presented. The coefficient is derived in terms of a collision frequency that is found from a memory function kinetic formalism. The formalism admits limits that allow a rigorous definition of the coefficient when the plasma is weakly coupled and approximations that provide a reliable calculation when the plasma is strongly coupled. In the latter case, use is made of spatial distribution functions computed from the solution to the set of integral equations describing plasma correlations via the hypernetted chain approximation (HNC). A simple analytic result is compared with the HNC calculations. Results show that, as expected, the classical form for the IB absorption coefficient is of little utility when the plasma is strongly coupled. The theory presented here should provide reasonable predictions of the coefficient.
ISSN:0031-9171
2163-4998
DOI:10.1063/1.865338