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Similarity Parameter Evolution within a Magnetic Nozzle with Applications to Laboratory Plasmas

Abstract

The scaling of plasma confinement, acceleration, and detachment from a magnetic nozzle is investigated within the context of present laboratory experiments. A review of the similarity parameters relevant to magnetic nozzle plasmas is provided. A quasi-one-dimensional model of the expanding plasma is then used to determine the evolution of these parameters downstream from the nozzle throat. Two types of plasmas are considered using this model: a cold ion, hot electron plasma with varying degrees of electron cooling; and a hot ion, cold electron plasma with varying degrees of ion temperature anisotropy. Finally, the results of the model are applied to ten different magnetic nozzle experiments to determine their relevant physical regimes.