Detailed spectral simulations in support of PBFA-Z dynamic hohlraum Z-pinch experiments

Summary form only given, as follows. In PBFA-Z dynamic hohlraum Z-pinch experiments, 16-18 MA of current is delivered to a load comprised of a tungsten wire array surrounding a low-density cylindrical CH foam. The magnetic field accelerates the W plasma radially inward at velocities /spl sim/40-60 cm//spl mu/s. The W plasma impacts into the foam, generating a high T/sub R/ radiation field which diffuses into the foam. We are investigating several types of spectral diagnostics which can be used to characterize the time-dependent conditions in the foam. In addition, we are examining the potential ramifications of axial jetting on the interpretation of axial X-ray diagnostics. In our analysis, results from 2-D radiation-magnetohydrodynamics simulations are post-processed using a hybrid spectral analysis code in which low-Z material is treated using a detailed collisional-radiative atomic model, while high-Z material is modeled using LTE UTA (unresolved transition array) opacities. We will present results from recent simulations and discuss ramifications for X-ray diagnostics.