Self-consistent Langmuir waves in resonantly driven thermal plasmas

Details Self-consistent Langmuir waves in resonantly driven thermal plasmas Self-consistent Langmuir waves in resonantly driven thermal plasmas

2007-01-24

arxiv.org/abs/physics/0701288v1

Physics

Plasma Physics

11 pages, 4 figures, submitted to Physics of Plasmas

Scientific paper

10.1063/1.2801714

The longitudinal dynamics of a resonantly driven Langmuir wave are analyzed in the limit that the growth of the electrostatic wave is slow compared to the bounce frequency. Using simple physical arguments, the nonlinear distribution function is shown to be nearly gaussian in the canonical particle action, with a slowly evolving mean and fixed variance. Self-consistency with the electrostatic potential provide the basic properties of the nonlinear distribution function including a frequency shift that agrees well with driven, electrostatic particle simulations. This extends earlier work on nonlinear Langmuir waves by Morales and O'Neil [G. J. Morales and T. M. O'Neil, Phys. Rev. Lett. 28, 417 (1972)], and could form the basis of a reduced kinetic treatment of Raman backscatter in a plasma.

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