Abstract
The expansion of pure electron plasmas due to collisions with background neutral gas atoms in the Electron Diffusion Gauge experimental device is observed to be in good agreement with the predictions of a macroscopic fluid model with uniform electron temperature. Measurements of the expansion with a two-dimensional (2-D), phosphor-screen density diagnostic suggest that expansion rates measured with the 1-D diagnostic were observed concurrently with substantial changes in the plasma that are not due to electron-neutral collisions. Measurements of the on-axis, parallel plasma temperature evolution support this conclusion and further indicate that the plasmas are continuously losing energy during the expansion, presumably through inelastic collisions with trace background gases.
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