Accession Number : ADA293697

Title :   Stable High-Power Harmonic Gyro-Amplifiers.

Descriptive Note : Final rept.,

Corporate Author : CALIFORNIA UNIV LOS ANGELES

Personal Author(s) : Luhmann, N. C., Jr

PDF Url : ADA293697

Report Date : 30 SEP 1994

Pagination or Media Count : 26

Abstract : The focus of our Tri-Service University Research Program in Vacuum Electronics has been on basic research issues associated with operating harmonic gyrotron devices as high-power, coherent millimeter-wave amplifiers. Substantial theoretical and experimental progress has been achieved. We introduced the marginal stability design (MSD) procedure(1) for achieving stability in high-performance gyro-TWT's. We also concluded the initial tests of the high power, second-armonic TE21 gyro-TWT amplifier which is based on the MSD procedure and the novel concept that harmonic operation is capable of significantly increasing the output power because the start-oscillation beam current is much higher for the relatively weak harmonic interaction. Indeed, the second-harmonic gyro-TWT amplifier's unprecedented output power of 207 kW exceeded the previous record-level of 120 kW, which was produced by a first-harmonic gyro-TWT. Our amplifier yielded an efficiency of 13%, a saturated gain of 16 dB with a bandwidth of 2% and was stable for zero rf input power. (MM)

Descriptors :   *GYROTRONS, *HARMONIC GENERATORS, HIGH POWER, SECOND HARMONIC GENERATION, WAVEGUIDES, MILLIMETER WAVES, ELECTRON BEAMS, THIRD HARMONIC GENERATION, AMPLIFIERS, KLYSTRONS, MAGNETRONS.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE