Design of a 140 GHz, 100 W gyroklystron amplifier

Summary form only given. We present the preliminary design and the simulation results for a 140 GHz, 100 W CW gyroklystron amplifier for use in dynamic nuclear polarization (DNP) experiments. The amplifier operates with a 10 kV, 100 mA electron beam and simulations show a saturated gain of 32 dB at /spl alpha/=1.4 for the TE/sub 02/ mode with an efficiency of 9% and output power of 86 W. The use of photonic band gap (PBG) cavities to suppress mode competition is also under evaluation.