Trapping and Frequency Variability in Electron Acoustic Waves

Journal Article · Tue Nov 10 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3266805· OSTI ID:21335667

Driscoll, C F; Anderegg, F; Dubin, D H. E.; O'Neil, T M ^[1]

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1. Department of Physics, University of California at San Diego, La Jolla, California 92093 (United States)

Electron Acoustic Waves (EAWs) with a phase velocity less than twice the plasma thermal velocity are observed on pure ion plasma columns. At low excitation amplitudes, the EAW frequencies agree with theory; but at moderate excitation the EAW is more frequency-variable than typical Langmuir waves, and at large excitations resonance is observed over a broad range. Laser Induced Fluorescence measurements of the wave-coherent ion velocity distribution show phase-reversals and wave-particle trapping plateaux at {+-}v{sub ph}, as expected, and corroborate the unusual role of kinetic pressure in the EAW.

• OSTI ID: 21335667
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1188; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
ELECTROMAGNETIC RADIATION
ELECTRON PLASMA WAVES
EXCITATION
FLUORESCENCE
IONS
MAGNETOHYDRODYNAMICS
PHASE VELOCITY
PLASMA
PLASMA DENSITY
RESONANCE
TRAPPING