Abstract
Results from a quasioptical gyrotron experiment with a 20--28-cm mirror separation are presented showing operation from 95--130 GHz at powers up to 148 kW and output efficiencies up to 12%. The output coupling could be varied from 0.4%--3% by changing the mirror separation and operating frequency. Efficiency optimization by variation of output coupling and by tapering the magnetic field has been demonstrated and regions of single-mode operation at powers up to 125 kW have been characterized.
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