Effective opacity of dense tokamak plasmas at the second electron cyclotron harmonic

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Abstract
The perpendicular propagation of the extraordinary wave near the second electron cyclotron harmonic is analyzed by means of a numerical code embodying a full wave relativistic scheme. Discussion of the results in comparison with the standard WKB ones is performed in view of absorption and emission applications. It is found that in the density regime called the ’’overcritical case’’ the effective optical depth scales, as an effect of the increased interaction of the extraordinary wave with a quasielectrostatic wave, differently from the WKB estimate. An explicit evaluation of reflection and transmission coefficients is given.