Beam-Generated Waves in a Large Plasma Chamber

Paul J Kellogg, Steven J. Monson, Robert H. Holzworth, R. Jerry Jost

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Plasma waves generated in a large vacuum chamber (20 x 30 m) by an electron beam of energy 0.5 to 2 keV, are measured. Both pre-beam plasma discharge (pre-BPD) and beam plasma discharge (BPD) states are investigated. The measured waves fall roughly into three categories: 1) a low-frequency spectrum with f ≪ fce, fp; 2) a whistler mode spectrum; and 3) a high-frequency spectrum. The extremely low frequency waves are shown to be surface waves on a (nonneutral) plasma column but a higher frequency part of the low-frequency spectrum was not thoroughly investigated. It is speculated that it also represents surface waves on a nonneutral column. Its measured properties are consistent with the lower hybrid drift instability. The whistler mode spectrum seems to be a Cerenkov resonance with the lower Trivelpiece-Gould mode. It does not seem to play an important role in modifying the particle distributions. The high frequency spectrum is, as suggested by Rowland et al. [21], a Cerenkov resonance with the upper Trivelpiece-Gould mode. It is responsible for the major perturbation of the beam energy in BPD.

Original languageEnglish (US)
Pages (from-to)891-901
Number of pages11
JournalIEEE Transactions on Plasma Science
Volume14
Issue number6
DOIs
StatePublished - Dec 1986

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