Phase Resolved Imaging of a Repetitive Extrusion of Hydrogen Plasma From a Hollow Cathode Source

Sam Dixon, James Peter Dedrick, Christine Charles, Timo Gans, Deborah O'Connell, R. W. Boswell

Research output: Contribution to journalArticlepeer-review


Hydrogen plasmas are useful in many areas of materials processing. In this paper, a hydrogen plasma is produced in a hollow cathode source and its expansion into a chamber over the course of an RF cycle (80 ns) is observed with an intensified CCD camera. The source is observed to launch plasma down into the expansion region once per RF cycle. The shape of the extrusion suggests a surface wave carries charge down the inside of the glass tube, before the plasma collapses back to the center of the tube downstream from the source. At the end of the RF cycle, the plasma in the tube is seen to completely detach from the source plasma.
Original languageEnglish
Pages (from-to)2834-2835
Number of pages2
JournalIEEE transactions on plasma science
Issue number10
Publication statusPublished - 21 Oct 2014

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