High-power electron beam deposition studies on aluminum and graphite

The deposition phenomena produced by a 25–-135-MW electron beam have been studied experimentally on aluminum and graphite targets. Large concentrations of multicharged ions of Al and C were produced. The parameters which were obtained quantitatively included momentum transferred to the target by the blow-off material, total mass loss, species velocities, radiation losses, and enthalpy rise in the target materials. From these data the energies of sublimation for aluminum and graphite were calculated, together with the distribution between spall and vapor species in the blow off. Some of the results are compared with laser data.