Abstract
Double mode conversion from ordinary mode O to extraordinary mode X is used to achieve electron Bernstein wave (EBWs) for the electron cyclotron resonance heating (ECRH). The efficiency of the mode conversion depends on many parameters including the density gradient Ln, magnetic field source B0 and optimum launching angle Nz. An analytical formalism together with a numerical computation have been employed, considering W7X stellarator main parameters, such as 140 GHz, k0 = 29 cm−1, 2.5 T and 2.4 ×1020 m−3, in order to investigate the efficiency of the mode conversion. The values of the density gradient Ln, obtained by numerical simulation, are from 1 to 10 cm. These values of Ln correspond to the power transmission window TOSX from 88 to 29%. Moreover, the dispersion relation of the EBW mode propagation up to 10 harmonics, ω = 10ωce, has been plotted to help a better visualization of the EBW mode heating. Finally, the power deposition profiles around the resonance layers were calculated and presented.
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