Diagnosing copper wire array implosions on refurbished Z with detailed radiation-hydrodynamic models

Advances in diagnostic techniques at the Sandia Z-facility have facilitated the production of very detailed spectral data. In particular, data from the copper nested wire-array shot Z1975 potentially provides a wealth of information about the implosion dynamics and ionization history of the pinch. This shot was simulated with the NRL 1-D DZAPP non-LTE radiation-hydrodynamics model, and the resulting spectra compared with the measured radiation data. In addition to Cu, there were lines of Ni and Fe present; these materials (4% Ni and ∼2% Fe) were included in the calculation. K-alpha lines from various ionization stages of these materials were observed and we will examine the mechanisms for their production. The K-alpha data is consistent with a region of dense, cool plasma near the outer edge of the pinch, which undergoes inner-shell photoionization by K-shell emission from the hot plasma near the axis. Results from the simulations, including hydrodynamic data and atomic spectra will be presented.