Relativistic L-band magnetron and nonrelativistic oven magnetron experiments

Summary form only given, as follows. Investigation is underway of the effects of space charge densities and impedances of the relativistic L-band magnetron and nonrelativistic oven magnetron. A Maxwell Physics International L-band magnetron is being driven by the MELBA accelerator. Parameters attained include: voltage=-400 kV, current=1-10 kA, and pulselengths=0.1-0.5 microseconds. Time frequency analysis of the heterodyned microwave signals finds generation at two frequencies 1.04 GHz and 0.95 GHz in the relativistic magnetron. Measured microwave power has been generated of at least 150 MW out of one cavity (with 2 output cavities). Microwave power versus beam current and beam pulselength will be presented. Stark broadening of H lines is being explored as an electric field diagnostic. Commercial kilowatt oven magnetrons operating in S-band (2.45 GHz) are also being investigated. Oven magnetron efficiency and time-resolved frequency spectra are studied under varying parameters.