Modeling of K-shell Al and Mg Radiation from the Implosions of Nested and Small Radius Single Cylindrical Arrays produced on the 1 MA Cobra Generator at Cornell University

Summary form only given. K-shell radiation of Al and Mg from implosions of nested and small radius single cylindrical wire arrays on the Cornell IMA COBRA generator was studied. Specifically, radiation from implosions of nested arrays with eight Al alloy wires in an inner array combined with eight stainless steel or brass wires in an outer array and the reverse were analyzed. In addition, small radius (equal to the radius of the inner array) single arrays with sixteen Al alloy wires were considered. Two alloys were tested, 95% Al and 5% Mg (Al 5056) and 99.2% Al and 0.8% Mg (Al 5005). The utilization of the alloyed Al wires with different small concentrations of Mg allows the study of the opacity of the Al lines by the use the opacity-free Mg lines in K.-shell plasma diagnostics. Spatially resolved -time integrated and time-gated -spatially integrated spectra from the Al-alloy plasmas were analyzed by means of non-LTH kinetic modeling. As a result, spatially resolved electron temperatures and densities for all considered experiments as well as time resolved parameters for some of the shots were computed and compared for different wire compositions and types of the loads. Time-gated spectra were recorded at the start of the main x-ray burst and hence their modeling provides the initial electron temperatures and densities at stagnation. The temporal evolution of these parameters was also compared with the same parameters, but derived from the time-gated spectra recorded after the main x-ray burst. In addition, cases in which there is strong opacity in Al lines will be discussed along with the future development of the models.