Abstract
High power, single mode oscillations from a sub-terahertz gyrotron, at a second harmonic, were successfully demonstrated with pulse operation. A powerful electron gun was applied to attain high power oscillation. The resonant modes were selected carefully enough to oscillate singly and the cavity shape was optimized for the resonant modes to interact efficiently with an electron beam generated by the electron gun. Optimizing the operational parameters produced output powers of 33 and 27 kW, at frequencies of 349 and 389 GHz, respectively the highest oscillation powers obtained to date in the sub-terahertz frequency region.
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