Effect of Electron Collisions on Ion-Acoustic Waves and Heat Flow
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چکیده
Introduction The damping rate of ion-acoustic waves in plasma plays an important role in establishing the threshold for the onset of stimulated Brillouin scattering, ion-temperature-gradient instability, current-driven ion-acoustic instability, and other drift-wave microinstabilities. The effect of electron-ion (ei) collisions on the ion-acoustic damping rate has been recently investigated by analytically solving the electron FokkerPlanck (FP) equation for a Lorentz plasma (i.e., neglecting e-e collisions) with cold ions and arbitrary kdei (where k is the wave number and lei is the e-i mean free path).' It was shown that, as e-i collisions are introduced, the damping rate yrises monotonically above the collisionless Landau limit y ~ , 112 reaches a peak at kdei (2rne/mi) (where Z is the charge number and rn is the mass), and then decreases to zero as kdei + 0 with the damping rate yfluid predicted by fluid theory.
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