Stable High-Power Harmonic Gyro-Amplifiers.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1994
- Accession Number
- ADA293697
Entities
People
- N. C. Luhmann Jr.
Organizations
- University of California, Los Angeles