Abstract
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 ±vph, as expected, and corroborate the unusual role of kinetic pressure in the EAW.
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