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The propagation of the HE(11) mode and Gaussian beams in hollow oversized circular waveguides are analysed using optical theories. Different types of waveguides are considered: hollow dielectric or conducting waveguides, dielectric-lined waveguides, and corrugated waveguides. General formulae are are derived which give the power transmission through these different guides. The best wall materials and structures are determined from a comparison of the waveguides transmissions, at the infrared and millimetre wavelengths. The question of the coupling between the HE(11) mode and the Gaussian beam is discussed and from a review of coupling coefficients derived previously, an optimum value is shown. The problem of matching a Gaussian beam into circular waveguides in order to achieve the maximum power transmission is analysed. These results are of interest for infrared lasers or waveguide applications and for electron cyclotron wave (ECW) systems at the millimetre wavelength.

Additional information

Authors: CRENN J P, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1485 EN (1993) 38 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
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