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At KIT, high power gyrotrons of conventional (1 MW CW at 140 GHz for the stellarator Wendelstein 7-X) and coaxial type (2 MW short-pulse at 170 GHz for ITER) for fusion applications are developed and verified experimentally.
In recent years, the so called after cavity interaction (ACI) in high power gyrotrons operating in the 100-200 GHz range gained attention as an influence factor on overall efficiency. While investigations concentrated on ACI as a stationary effect until now, recent simulations show that an undesired interaction in the uptaper region can also result in additional parasitic oscillations. In this paper,...
Recently megawatt gyrotrons are found to suffer from various parasitic oscillations, particularly RF oscillations in the beam tunnel induced by the electron beam prior to the desired interaction zone (cavity). The paper describes experimental and theoretical investigations on both high and low frequency parasitic oscillations, employing a special measurement system as well as a novel analysis method...
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