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Relativistic L-band magnetron experiments driven by a microsecond e-beam accelerator

This research program investigates high power microwave generation utilizing a microsecond electron beam accelerator to drive a relativistic magnetron. Peak microwave power levels have been achieved exceeding 200 MW total (100 MW per-cavity for two-cavity extraction) from a six-vane structure. Time-frequency analysis shows that microwave emission is primarily single-mode with a total pulse duration in the range of 50 - 100 ns. Relativistic magnetron end-loss current measurements have been performed. Preliminary total efficiency estimates for the relativistic magnetron are in the range of 13%, including endloss current. If endloss current is subtracted, the magnetron electronic efficiency nearly doubles to 25%. The goal of future research is to explore techniques for increasing the microwave power, efficiency and pulselength of relativistic magnetrons.