Theoretical Study of Non-LTE Processes in Laser Heated Plasmas.

摘要

The development of a code for calculating the non-LTE kinetics of the excitation and ionization of a laser heated plasma,and prediction of the emitted x-ray spectrum is described. This code is intended to be used for exploratory studies in which x-ray conversion efficiencies for various densities,compositions,temperature profiles,etc.,are calculated. To carry out such computations rate coefficients for all possible transitions must be available. A simple method of calculating these rates is derived. Since numerous runs involving a wide range of parameter choices is envisaged it is desired that the basic time step in the integration be very large. The resulting problem of stiffness of the rate equations and methods of overcoming it are discussed. Preliminary results for a neon plasma are presented. (Author)