Evolution of the parallel and perpendicular ion velocity distribution functions in pulsed helicon plasma sources obtained by time resolved laser induced fluorescence

Costel Biloiu, Xuan Sun, Edgar Choueiri, Forrest Doss, Earl Scime, John Heard, Rostislav Spektor, Daniel Ventura

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

The temporal evolution of parallel and perpendicular ion velocity distribution functions (ivdf) in a pulsed, helicon-generated, expanding, argon plasma is presented. The ivdf's temporal evolution during the pulse was determined with time resolved (1 ms resolution), laser induced fluorescence. The parallel ivdf measurements indicate that, in the expansion region of the plasma and for certain operational parameters, two ion populations exist: a population moving at supersonic speeds (1.1 Mach) resulting from acceleration in an electric double layer (EDL) and a slow moving population (0.7 Mach) generated by local ionization. After 100 ms, although present, the EDL is not fully developed and has not reached a steady-state. Measurements of the perpendicular ivdf indicate constant radial expansion, with ion speeds of ≈400 m s -1, in the expansion region.

Original languageEnglish (US)
Pages (from-to)766-776
Number of pages11
JournalPlasma Sources Science and Technology
Volume14
Issue number4
DOIs
StatePublished - Nov 1 2005

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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