Spectroscopic diagnosis of core conditions in highly magnetized cylindrical implosions*

We discuss the application of time-resolved Ar K-shell spectroscopy to diagnose the core conditions in highly magnetized cylindrical implosions. An external seed B-field of ∽30 T is applied to Ar-doped, D₂-filled cylindrical targets, which are directly-driven by using 40 OMEGA laser-beams. The plasma dynamics are numerically investigated in 2-D with the MHD code GORGON, proving that an extreme magnetization regime is attainable. Post-processing the MHD output by means of detailed Non-LTE atomic kinetics and Stark-broadened line profiles permits to obtain synthetic spectra that approximate the expected observations. The impact of the B-field produces significant variations on the core conditions throughout the implosion collapse which leads to distinctive spectral features measurable by available streaked spectrometers. Difficulties to extract representative values of core conditons due to the large spatial gradients arising in the magnetized scenario are discussed. By assuming the magnetic field is frozen into the plasma motion, the spectroscopic analysis is used to estimate a collection of metrics about the relative importance of magnetization processes in the compressed core. A preliminary analysis of recently recorded Ar K-shell spectra will be also presented.