Progress in the Refining of the K-Shell Yield Scaling Model for Z-Pinch Plasma Radiation Sources

Analytical scaling models of K-shell radiation yield from the imploding Z-pinch plasma radiation sources (PRS) have been advanced at NRL. Those developed by Mosher-Krishnan-Qi, MKQ [1] , and Thornhill-Whitney-Giuliani, TWG [2] , are the best-known and most helpful. They predict the K-shell yield as a function of input parameters, such as load mass and the energy coupled to the radiating plasma. These models are convenient for wide-range scoping studies of PRS, which are particularly important when next-generation pulsed power facilities are contemplated. The 2006 TWG model [2] was recently validated by benchmarking it against the most recent data from Z [3] . We discuss possible modifications of this model to better fit nested-wire-array and multiple-shell-gas-puff loads data, for wide ranges of materials, from Ne to Kr, and driver currents. To evaluate the coupled energy and to compare the scaling results with other theoretical predictions, we use lumped circuits with Hutsel-type current losses [4] to drive the loads approximated with 0-D models (wire dynamics and snowplow), as well as 1-D (DZAPP) and 2-D (Mach-2) RMHD models.