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We report the design and experiment of a 220/420-GHz gyrotron oscillator for nondestructive evaluation which operates at the fundamental near 220 GHz and the second harmonic near 420 GHz of the electron cyclotron resonance frequency. Through optimizing electron gun for both operation modes, the TE26 mode at 423.1 GHz and the TE03 mode at 221 GHz are observed at output powers up to 8 and 6 kW, respectively,...
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