IONIZATION BALANCE AND GAIN CALCULATIONS FOR NEON-LIKE SELENIUM X-RAYLASER PLASMAS

We have developed compact collisional-radiative models to describe the ionization balance and excitation mechanisms in neon-like selenium x- ray laser plasmas. These models can be used for calculations of the io nization dynamics, detailed emission spectra, and gain coefficients. C areful attention has been paid to indirect processes such as dielectro nic recombination, excitation-autoionization, and resonant excitation. We discuss the importance of different atomic processes and model app roximations in the ionization balance and gain calculations. These res ults will be compared to experimental measurements and to previous cal culations.