Depressed Collector Experiments on a Quasioptical Gyrotron
NAVAL RESEARCH LAB WASHINGTON DC
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A simple, single, single-stage collector has been tested on the quasioptical gyrotron QOG experiment at the Naval Research Laboratory NRL. This is the first application of a depressed collector to a high power gyrotron, and was relatively easily accomplished due to the natural separation of the electron beam and the output radiation in the QOC. Collector efficiencies as high as 50 and overall efficiencies up to 16 were observed. The output power reached 431 kW with an overall efficiency of 13 and a collector efficiency of 41. The collector efficiency was limited in this experiment due to interception of approximately 15 of the electron beam on an undepressed section of the beam guide, a problem readily correctable with a small change in the beam guide dimensions. If this part of the electron beam was collected at the collector potential, the overall and collector efficiency would increase to 16 and 55 respectively. The maximum collector efficiency would increase to 58 at high output power and the best overall efficiency would increase to 20 at lower output power.
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