Heavily-loaded W-band TE/sub 01/ gyro-TWT

Summary form only given, as follows. A high performance, high power TE/sub 01/ gyro-TWT is being constructed at UCD that will be driven by a 100 kV, 5 A, MIG electron beam with v/spl perp//v/sub z/=1.0 and /spl Delta/v/sub z//v/sub z/=5%. The two-stage amplifier is heavily loaded for stability and is predicted by our large-signal simulation code to generate 100 kW at 94 GHz with 20% efficiency, 40 dB saturated gain and 4% constant-drive bandwidth. Linear theory has been used to determine the threshold start-oscillation beam current for absolute instability and the critical section lengths for the potential harmonic gyro-BWO interactions. The MIG was designed with FINELGUN and is being fabricated at NTHU. The edges of the emitter are coated with molybdenum to suppress edge emission.