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iv cavity operated stably over a wide range of operating parameters and allowed to achieve high efficiency of the main mode. Comparison of the experimental and theoretical results showed very good agreement. Experimentally the following result has been achieved in CW operation: 22.5 kW output microwave power at 23.4 kV electron beam voltage and 2.23 A electron beam current with the world record efficiency of 43 % for CW gyrotrons operated at the frequency of 28 GHz at the second harmonic of the cyclotron frequency.

Design and Experimental Investigation of a Second Harmonic 20 kW Class 28 GHz Gyrotron for Evaluation of New Emitter Technologies