Accession Number : AD0779067

Title :   Hot-Spot Model of K-Line Emission from Laser-Heated Plasmas.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Whitney,K. G. ; Davis,J.

Report Date : APR 1974

Pagination or Media Count : 47

Abstract : A nonhydrodynamic model is developed to describe X-ray emission from laser-heated plasmas on a subnanosecond time scale. The model is first correlated with experiment and then is used to study the conversion efficiency of laser energy to K-line X-rays in carbon, fluorine, and aluminum plasmas as a function of incident laser intensity. It is found that these conversion efficiencies peak at well defined values of input energy per area for laser pulse widths smaller than the pumping time for K-line emission. In this case, the degree and not the rate of plasma heating is important in determining the peak conversion efficiency. It is also found that peak conversion to K-radiation in excess of roughly 10 or 20% occurs only when the C, F, and Al plasmas are optically thick to the K sub alpha lines. (Author)

Descriptors :   *Plasmas(Physics), *X rays, *Laser beams, Electron density, Ion density, Electron energy, Mathematical models

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE