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This paper reports on cold test and high power measurements of the improved, dimple type quasioptical mode converter for the 118 GHz, 0.5 MW, 210 s TE (22.6) gyrotron oscillator collaboratively developed by CEA Cadarache, CRPP Lausanne, FZK Karlsruhe and Thomson Tubes Electroniques Vélizy. For the low power measurements the required rotating TE (22.6) mode was generated in a coaxial cavity using quasioptical techniques. The high power measurements were performed on the gyrotron output beam using an infrared camera. The evaluated mode purity of the linearly polarized fundamental Gaussian output mode is 96% plus or minus 1% in agreement with calculations.

Additional information

Authors: BRAZ O ET AL, Forschungszentrum Karlsruhe GmbH (DE);COUDRAY R ET AL, Thomson Tubes Electroniques, Vélizy-Villacoublay (FR);TRAN M Q ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Twentieth International Conference on Infrared and Millimeter Waves : Conference Digest (1995) pp. 281-282
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