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Current-free double-layer formation in a high-density helicon discharge

Charles, Christine; Boswell, Rod


A strong, current-free, electric double-layer with eΦ/kTe∼3 and a thickness of less than 50 debye lengths has been experimentally observed in an expanding, high-density helicon sustained rf (13.56-MHz) discharge. The rapid potential decrease is associated with the “neck” of the vacuum vessel, where the glass source tube joins the aluminumdiffusionchamber, and is only observed when the argon gas pressure is less than about 0.5 mTorr. The upstream electron temperature Te appears 25% greater than...[Show more]

CollectionsANU Research Publications
Date published: 2003-03-03
Type: Journal article
Source: Applied Physics Letters
DOI: 10.1063/1.1557319


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