Abstract
The absorption and amplification of fundamental electron cyclotron radiation in inhomogeneous, weakly relativistic, loss-cone and partially filled loss-cone plasmas, are studied for both perpendicular and oblique propagation, and the extraordinary mode is numerically analyzed. It is shown that there are situations where small changes in the distribution function may strongly affect the wave vector, and an explanation is given, pointing to the eventual relevance of the use of the full momentum distribution, along with relativistic effects, in the evaluation of both the real and imaginary part of the dielectric tensor. A model that could describe plasmas in actual situations like the thermal barriers in tandem mirror devices is presented and numerically investigated, and it is shown that particles scattered into the loss cone may play a relevant role.
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