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Fusion plasma experiments require very powerful heating systems to achieve the needed high plasma temperatures. For Electron Cyclotron Resonance Heating and Current Drive (ECRH&CD), the gyrotron oscillator is the only known source which is capable to produce a megawatt-level RF output power [1] in the range from 30 GHz up to 300 GHz for a possible future DEMO EC heating system. The excitation of the main operating mode in the gyrotron cavity and the separation of this mode from the different possible competing modes is a very challenging task due to the very high order of that modes. A similar problem exists for the excitation of the wanted high-order mode in low-power test systems to validate the quasi-optical output system of that kind of gyrotrons. But, the availability of such a test system is vital during the gyrotron design and validation phases. Particularly, the launcher of the quasi-optical output coupler, which converts the rotating high-order operating cavity mode into a linearly polarized Gaussian output beam, is the critical component here. The existing test set-up at Karlsruhe Institute of Technology (KIT) which basic idea bases on [2], includes a quasi-optical mode generator using fully manually operated mechanical sliding units [3]. Obviously, those manual sliding units suffer from a large hysteresis, hence, require a very time-consuming adjustment. Here the first steps towards a fully automated test system are presented.

Towards Fully Automated Systems for the Generation of Very High Order Modes in Oversized Waveguides