Theory of Dielectric Function in a Magnetized Plasma.
CALIFORNIA UNIV LOS ANGELES PLASMA PHYSICS GROUP
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A general formulation for the dielectric function has been developed for plasmas in thermal equilibrium so that the particle orbit diffusion can be taken into account. The formulation can describe both the charged-neutral collisions and the diffusion caused by thermal fluctuations. Without assuming a thermal equilibrium system, a general relation for the correlation functions is obtained which reduces to a nonlinear fluctuation-dissipation theorem for thermal equilibrium plasmas. When a strongly-magnetized two-dimensional plasma is considered, it is shown that a low-frequency slightly-damped mode exists for k k sub D. Calculations of auto-correlation functions for the kth Fourier mode show a Gaussian-type decay for k much greater than k sub D and a damped oscillation for k much less than k sub D. Author
- Plasma Physics and Magnetohydrodynamics