Experimental Benchmark for Improved Simulation of Absolute Soft X- Ray Emission from Polystyrene Targets Irradiated With the Nike Laser; Journal article

摘要

Absolutely calibrated, time-resolved spectral intensity measurements of soft x-ray emission from laser-irradiated polystyrene targets are compared to radiation-hydrodynamic simulations that include our new postprocessor, Virtual Spectro. This new capability allows a unified, detailed treatment of atomic physics and radiative transfer in non-LTE conditions for simple spectra from low-Z materials as well as complex spectra from high-Z materials. The excellent agreement (within a factor approximately 1.5) demonstrates the powerful predictive capability of the codes for the complex conditions in the ablating plasma. The absolute spectral intensity measurements were made in the XUV region (hv approximately 0.1-1.0 keV) with transmission grating spectrometers with good time resolution (t approximately 0.3 ns) and moderate spectral resolution (E/delta E approximately 10). Comparison to data with high spectral resolution (E/delta E approximately 1000) emphasizes the importance of including radiation coupling in the quantitative simulation of emission spectra.