The characterization of the electromagnetic field at the electron cyclotron frequency is one important point for the ECRH (Electron Cyclotron Resonance Heating) installation under development at the CEA Cadarache. This characterization is based on a mathematical decomposition of the electromagnetic field over the various radiating modes of an oversized corrugated waveguide. To perform this determination, which principle is given in the paper, one has to access the amplitude and the phase of the full electric field on a plane transverse to the propagation direction. It is possible to obtain amplitude and phase diagrams of the two crossed polarizations at low level. At high level, in the output of a gyrotron, one uses only thermal measurements and the phase is reconstructed from the amplitude diagrams. The paper exposes a complete validation of this method and gives the results of the high level characterization.

Characterization of the 118 GHz ECRH output beam on tore supra (CEA cadarache)

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Characterization of the 118 GHz ECRH output beam on tore supra (CEA cadarache)