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Radiation properties of ICRF waveguide couplers

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3 Author(s)
Heikkinen, J.A. ; VTT Energy, Euratom TEKES Assoc., Espoo, Finland ; Irzak, M.A. ; Shcherbinin, O.N.

The radiation spectra of a dielectric-filled waveguide (DWG) and a folded waveguide (FWG) antenna in the ion cyclotron range of frequencies are evaluated for tokamaks with the waveguide codes, which model the coupling of the waveguide modes to the plasma waves with outward radiating boundary conditions. The codes provide a self-consistent calculation of the fields across the waveguide apertures for various antenna phasings taking into account a complete set of waveguide eigenmodes including the reflected modes and, in the case of DWG, an arbitrary orientation of the antenna to the plasma magnetic field. In the studied cases, the spectra are found to be well described by a model which is based on a simplified wave field pattern determined by the antenna aperture geometry. Comparison to the corresponding loop antenna is carried out

Published in:

Plasma Science, IEEE Transactions on  (Volume:26 ,  Issue: 1 )

Date of Publication:

Feb 1998

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