L-shell spectroscopic diagnostics of imploding wire array plasmas

摘要

Intriguing time-gated, radially resolved L-shell line emission profiles have been observed from recent Cu/Ni wire array implosions on Sandia's Z facility. The well resolved measurements exhibit lineshapes that appear as hollow, asymmetric ovals whose variations in the intensity, spatial, and (Doppler-shifted) wavelength dimensions yield information on plasma densities, temperatures, gradients, dimensions, and velocities. We present an analysis of the measured L-shell emission using the accurate and flexible hybrid-structure collisional-radiative atomic model SCRAM and compare the diagnosed plasma conditions and modeled spectra with predictions and post-processed emission from the three-dimensional magneto-hydrodynamics code GORGON.