Stark-broadening of Kr L-shell lines in dense implosion core plasmas

Stark-broadening of K-shell x-ray line emission has been extensively used to diagnose electron density in implosion core plasmas. Here, we discuss results for detailed Stark-broadened spectral line shapes of L-shell n=4 to n=2 transitions in Be- and Li-like Kr ions. This line emission can be used to diagnose the implosion core plasma conditions of ICF experiments when the electron temperature is too high (e.g. 2keV) for lower-Z dopants (e.g. argon) to be useful since they are overionized. The calculations were performed with the multi-electron radiator model and code MERL for electron temperatures of 2 and 3keV and densities in the range from 1x10²³ to 5x10²⁴/cc. The calculations included the electric microfield perturbations of dynamic electrons and static ions; in addition, the ion dynamics effect has also been included since the majority of the perturbing ions in the plasma are deuterium ions which are much lighter than Kr ions. The static microfield mixes the atomic states resulting in a double peak structure that increases with density. The Stark-broadened line shapes are combined with atomic kinetics and radiation transport to obtain synthetic spectra which can be used both to qualitatively compare with the experimental measurements and validate the data analysis method.