Experiments have been performed on a coaxial gyrotron driven by the Michigan Electron Long Beam Axccelerator (MELBA) at parameters: V =0.8 MV, I =1-10 kA, and pulselength =0.5-1 microsecond. Microwave pulse shortening has been investigated by spectroscopic plasma diagnostics to characterize plasma effects inside the operating gyotron. Radio-frequency plasma processing has been applied to clean the inside of the gyrotron in order to reduce the deleterious effects of plasma on the microwave pulselength and energy. Results show that plasma cleaning can extend the microwave pulselength and increase the integrated microwave energy output by 15-245
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