Melt-layer erosion experiments for electric launchers and tokamak fusion reactors

Summary form only given, as follows. Melt-layer erosion is a major concern in electric launchers and fusion reactors, where components are exposed to high heat fluxes produced during transient plasma events. Melt-layer erosion is currently under investigation at NCSU. Samples are exposed to plasma formed by the electrothermal plasma generator PIPE.. Sample materials currently under consideration are 306SS, OFHC Cu, and Al. The cylindrical samples are 4.8 mm in diameter and 25.4 mm long. The samples are exposed at one end, 6.35 mm from the barrel of the source. Following exposure, the samples are bisected along the axial direction, polished, and etched for electron microscopy. Scanning Electron Microscopy (SEM) is used to determine the thickness of the re-solidified material retained on the surface, as well as micro-structural changes with the sample. Results are compared to current computer models of the phenomena. Current results are discussed.