STUDIES OF THE ABLATED PLASMA FROM EXPERIMENTAL PLASMA GUN DISRUPTIONSIMULATIONS

Extensive simulations of tokamak disruptions have provided a picture o f material erosion that is limited by the transfer of energy from the incident plasma to the armor solid surface through a dense plasma shie ld. Radiation spectra were recorded in the VUV and in the visible at t he Efremov Laboratories on VIKA using graphite targets. The VUV data w ere recorded with a Sandia Labs transmission grating spectrograph, cov ering 1-40 nm. Plasma parameters were evaluated with incident plasma e nergy densities varying from 10-100 MJ/m(2). A second transmission gra ting spectrograph was taken to 2MK-200 at TRINITI to study the plasma- material interface in magnetic cusp plasma, Target materials included POCO graphite, ATJ graphite, boron nitride, and plasma-sprayed tungste n. Detailed spectra were recorded with a spatial resolution of similar to 1 mm. Time-resolved data with 40-200 ns resolution was also record ed, The data from both plasma gun facilities demonstrated that the hot test plasma region was sitting several millimeters above the armor til e surface.