Wave-Particle Interactions in Electron Acoustic Waves in Pure Ion Plasmas
摘要：
Electron acoustic waves (EAW) 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 plateaus at +/-vph, as expected, and corroborate the unusual role of kinetic pressure in the EAW.
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关键词：
nonneutral plasmas electrostatic waves and oscillations (e.g., ion-acoustic waves) solitons BGK modes
DOI：
10.1103/PHYSREVLETT.102.095001
被引量：
年份：
2009
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