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Experiments and theory of an upstream ionization instability excited by an accelerated electron beam through a current-free double layer

Aanesland, Ane; Lieberman, M. A.; Charles, C.; Boswell, R. W.


A low-frequency instability varying from 10 to 20kHz has been discovered in the presence of a current-free double layer (DL) in a low-pressure expanding helicon plasma. The instability is observed using various electrostatic probes, such as Langmuir probes floating or biased to ion saturation and emissive probes measuring the plasma potential. A retarding field energy analyzer measuring the ion energy distribution function downstream of the double layer is used together with the LP to...[Show more]

CollectionsANU Research Publications
Date published: 2006-12-06
Type: Journal article
Source: Physics of Plasmas
DOI: 10.1063/1.2398929


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