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This paper reports on cold test and high power measurements of the improved, dimple type quasi-optical 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 quasi-optical techniques. The high power measurements were performed on the gyrotron output beam using an infrared camera. The evaluated mode purity of the linearly polarised fundamental Gaussian output mode is 96 +/- 1 % in agreement with calculations.

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Authors: BRAZ O ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);COUDROY R ET AL., Thomson Tubes Electroniques, Vélizy Villacoublay (FR);TRAN M ET AL., Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Proceedings of the 20th International Conference on Infrared and Millimeter Waves (1995) pp. 9-10
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