Abstract
Linear mode conversion and collisionless absorption of lower-hybrid waves propagating in an inhomogeneous plasma under the influence of a nonumiform magnetic field are studied. A locally evaluated dispersion relation is used to numerically compute the real and the imaginary parts of the density and magnetic field are in the same direction, it is found that the presence of the ion cyclotron harmonic resonance in the vicinity of the first turning point results in a new second turning point and a new branch for the hot plasma wave. On the other hand, if the gradients of plasma density and magnetic field are in opposite directions, the second turning point disappears and there is no mode conversion between the warm plasma and the hot plasma wave. Applications of this study to the lower hybrid plasma heating are discussed.
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