Gyro-TWT amplifier development at UCD: (1) 200 kW second-harmonic, (2) wideband and (3) slotted third-harmonic gyro-TWT`s
- Univ. of California, Davis, CA (United States). Dept. of Applied Science
The second-harmonic TE{sub 21} gyro-TWT with an 80 kV, 20 A, v{perpendicular}/v{perpendicular} = 1.0 MIG electron beam has yielded 210 kW at 16 GHz with 13% efficiency, 16 dB saturated gain, 2% saturated bandwidth and zero-drive stability. Harmonic gyro-TWT`s not only require a substantially weaker magnetic field and offer nearly the same high efficiency as fundamental gyro-TWT`s, but also have the potential to stably generate significantly higher levels of power because the threshold beam current level for oscillation is raised dramatically due to the relatively weaker harmonic interaction. The design for a 1 MW third-harmonic TE{sub 31} gyro-TWT utilizing a MIG will also be presented. The circuit for the earlier successful 90 kV, 5 A, v{perpendicular}/v{parallel} = 0.6, dielectric-loaded gyro-TWT, which yielded a peak power of 55 kW with 11% efficiency, 27 dB saturated gain, an unprecedented 11% constant-drive bandwidth and zero-drive stability, is being replaced by an all-metal circuit. Scaled hot-tests have been performed at 10 GHz of Varian/UCD`s 95 GHz, slotted third-harmonic gyro-TWT amplifier. The slotted third-harmonic amplifier yields approximately 13 dB of small-signal gain per section with a bandwidth of 4%. After the input/output couplers have been optimized to yield 0 dB coupling, the slotted gyro-TWT will be driven to saturation by a 1 kW helix TWT.
- OSTI ID:
- 153884
- Report Number(s):
- CONF-950612--; ISBN 0-7803-2669-5
- Country of Publication:
- United States
- Language:
- English
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