Mode competition using TE03 gyrotron cavities |
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| Authors: | E BORIE G GANTENBEIN B JÖDICKE G DAMMERTZ O DUMBRAJS T GEIST |
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| Affiliation: | 1. Kernforschungszentrum Karlsruhe GmbH, ITP , Postfach 3640, Karlsruhe 1, D-7500, Germany;2. Kernforschungszentrum Karlsruhe GmbH, ITP , Postfach 3640, Karlsruhe 1, D-7500, Germany;3. ABB Infocom AG , CH 5401, Baden, Switzerland;4. Technische Universit?t Hamburg-Harburg , Arbeitsbereich Hochfrequenztechnik, Hamburg 90, D-2100, Germany;5. Universit?t Karlsruhe, Institüt für H?chstfrequenztechnik und Elektronik , Kaiserstrasse 12, Karlsruhe, D-7500, Germany |
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| Abstract: | The gyrotron is a powerful source of millimetre wave radiation. Fusion applications require more power per tube than is currently available This in turn means that the resonator must be highly overmoded, with a dense mode spectrum, which leads to mode competition. The influence of external parameters, such as the applied magnetic field, electron beam, and resonator geometry, on mode competition in tubes designed to operate at 150 and 140 GHz in the TE03 mode is investigated theoretically and experimentally. It can be shown that even when the mode spectrum is fairly dense, single mode operation of a gyrotron is possible. The influence of startup conditions on output power is investigated in the 150 GHz experiment. In some cases, modes with an axial index of 2 were excited. |
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