Abstract
The experimental results of an overmoded slow-wave high-powermicrowave generator operated at low magnetic field arepresented. The feasibility of low magnetic field operation isinvestigated both theoretically and experimentally based on thecharacteristics of the overmoded slow-wave device. Theexperiments were carried out at the Spark-2 accelerator. Underthe condition of guiding magnetic field strength of 0.55 T, diodevoltage of 474 kV, and beam current of 5.2 kA, a microwavewas generated with power of 510 MW, mode of TM01, andfrequency of 9.54 GHz. The relative half-width of the frequencyspectrum is less than 1%, and the beam-to-microwave efficiencyis about 21% in our experiments.
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