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

### Description

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]

Collections ANU Research Publications 2019 Journal article http://hdl.handle.net/1885/213167 Plasma Sources Science and Technology 10.1088/1361-6595/ab20a5