Recent Advances in the Muri Eastern

Harmonic-Multiplying Gryo-Amplifiers. The Phigtron has been studied both theoretically and experimentally to demonstrate the performance capability of harmonic gyro-amplifiers and investigate the nonlinear electronic processes which are the basis for these devices. The key issues are to what extent frequency multiplication and cyclotron harmonic operation may degrade or possibly improve amplifier performance. The experiments were conducted with Ku-band input and Ka-band, TE3 mode output over a wide range of operating parameters. Output power as high as 720 kW, bandwidths up to 0.7%, efficiency of 36% and saturated gain of 30 dB were measured. Furthermore, phase noise and stability were studied. The results show that the Phigtron performs as well or better than the current state-of-the-art gyrotron amplifiers indicating that harmonic, frequency-multiplying operation may improve device performance.