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Excitation of linearly stable waves in a multispecies plasma

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2 Author(s)
Roth, I. ; Space Sci. Lab., California Univ., Berkeley, CA, USA ; Hudson, M.K.

Excitation of electrostatic modes as a result of the injection of an argon beam into a multispecies plasma is investigated. It is shown that the injection of a warm artificial beam into a thermal plasma may excite waves of significant amplitude with a range of phase velocities which are linearly stable. These waves appear as a result of the correlation between motions of an individual particle in a Vlasov fluid. When the free energy is derived from a warm beam and the linear instability diminishes due to the large temperature of the beam, the competing mechanism of thermal fluctuations is responsible for the main excitation of waves. This mechanism is valid for the various modes in a multispecies plasma with a higher enhancement at the lower hybrid than at the ion-ion hybrid modes

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Plasma Science, IEEE Transactions on  (Volume:17 ,  Issue: 2 )