Stable operation of a slotted third-harmonic gyro-TWT amplifier
- Univ. of California, Davis, CA (United States). Dept. of Applied Science
A low magnetic field, moderate voltage gyrotron amplifier has been designed in collaboration with CPI/Varian for stable, high performance operation at 95 GHz and tested in a scaled experiment at 10 GHz. A slotted interaction circuit is utilized to achieve strong amplification at the third harmonic. The start-oscillation conditions were determined by an analytical theory that will be described. The dominant threat to the amplifier`s stability is from a third-harmonic peniotron backward-wave interaction. A self-consistent slow-timescale particle-tracing simulation code predicts the three-section, slotted third-harmonic gyro-TWT, which utilizes an 11.6 kG magnet and a 50 kV, 3 A, v{sub {perpendicular}}/v{sub Z} = 1.4, axis-encircling electron beam with an axial velocity spread of 6%, will yield an output power of 30 kW with an efficiency of 20%, a saturated gain of 40 dB and a constant-drive bandwidth of 2%.
- OSTI ID:
- 428045
- Report Number(s):
- CONF-960634--
- Country of Publication:
- United States
- Language:
- English
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