Initial operation of the University of Maryland X-band coaxial gyroklystron experiment

Summary form only given. In this paper we detail the result from the initial operation of the University of Maryland's coaxial gyroklystron experiment, which is being evaluated as a potential driver for future colliders. The interaction is designed to occur between 500 kV, 500-700 A beam and a series of coaxial TE/sub 011/ microwave cavities. Output powers in excess of 100 MW at 8.568 GHz are expected with an efficiency of about 40%. We present results of the electron gun performance, the stability of the tube, and the amplification properties of the microwave circuit.