1-D MHD simulation of an argon gas puff implosion with time-dependent non-LTE kinetics*

Ar gas puff implosions have been performed on SNL’s Z machine. One frequently fielded platform has a mass profile of 1:1.6 from an 8 cm dia. nozzle, 1 mg/cm mass, and a 2.5 cm height. These experiments produced K-shell yields >300 kJ. The 2-D MHD code Mach2+TCRE reproduced the measured powers, yields, and emission region. The ratio of the Lyα to the Heα+IC lines from the simulation matched the experiment after peak power. Yet, the simulation had higher line ratios earlier. This difference was attributed to 3-D effects or on the assumption of steady-state kinetics [1]. This presentation will explore the effect of time-dependent kinetics using the NRL DZAPP code. DZAPP is a coupled 1-D MHD, non-LTE atomic kinetics, and radiation transport code that incorporates a transmission line to drive the load. Line ratios from steady-state and time-dependent kinetics will be presented and compared.

1. J.W. Thornhill et al. IEEE Tran. Plasma Sci. 43, 2480 (2015)

 

*This work is supported by DOE/NNSA. SNL is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOE/NNSA under contract DE-NA-0003525.

 

DISTRIBUTION A. Approved for public release: distribution unlimited.