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Field-aligned Boltzmann electric triple layer in a low-pressure expanding plasma

Bennet, Alexander; Charles, Christine; Boswell, Roderick


A deep and narrow potential structure has been measured along the last magnetic field line to exit the source tube of an expanding plasma device. The potential structure is identified as an electric triple layer and features a potential dip with Full Width Half Maximum ~70 Debye lengths (16 mm), depth of ~25 V ($q{\phi }_{{\rm{drop}}}/{{kT}}_{e}\sim 2$) and its width and magnitude are seen to decrease with increases in argon pressure. The triple layer acts as a potential barrier for...[Show more]

CollectionsANU Research Publications
Date published: 2019
Type: Journal article
Source: Plasma Sources Science and Technology
DOI: 10.1088/1361-6595/ab20a5


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