Temperature-Dependent Hypersonic Flow Patterns of Expanding High-Density Metal Vapor Plasma from Capillary Source Simulating Plasma Flow Following a Fusion Disruption
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Capillary discharge devices generating electrothermal plasmas from ablation of a liner material exposed to high heat flux are adequate devices to simulate fusion disruptions. Expansion of capillary-generated plasma into large volume simulates the evolution of the aerosol and plasma particulates into the reactor vacuum vessel. Effect of non-linearity and plasma bulk temperature on the adiabatic compressibility index was previously investigated showing considerable effect on the bulk flow parameters of polycarbonate plasma formed by the ablation of the capillary inner wall. In a fusion reactor, metals in the plasma-facing components such as the divertor, limiter, and first wall, will experience evaporation and formation of metal-vapor plasmas. Mathematical models have been developed to investigate the adiabatic compressibility index of ionized bulk metal vapors taking into account atomic and cluster ionization of metals, in addition to the effect of plasma bulk temperature and other nonlinearities. An important aspect of this current work is the distinction of the ionized states of metallic species instead of temperature-dependent lumped effective atomic number.
KeywordsElectrothermal plasma expansion Metal vapor plasma Adiabatic compressibility index Fusion disruption PFC disruption Particulate expansion
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