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Abstract

The operating characteristics of a low Q (Qcav = 225), 8 GHz gyrotron oscillator operating in TEo (011) mode and submitted to various mismatched loads are reported. Under matched conditions, output power up to 310 KW (ita=35%) and maximum efficiency up to 43% have been measured. In general, power reflection from loads with different phase and amplitude leads to an output power decrease. Too high reflections cause mode switching (TEo (011) to TEo (012)) or even arcing inside the tube. The effect of power reflection is seen to increase rapidly with current and output power. Nevertheless, it is observed that, as predicted by the calculations, the maximum output power is not reached under matched conditions but with a specific value of the complex reflection coefficient.

Additional information

Authors: MUGGLI P, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);TRAN M Q, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);TRAN T M, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);ALBERTI S, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);PERRENOUD A, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);MATHEWS H G, ABB Infocom SA, EKR Division, Baden (CH);AGOSTI G, ABB Infocom SA, EKR Division, Baden (CH)
Bibliographic Reference: Report: LRP 368/89 EN (1989)
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
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