Stability of a 95-GHz slotted third-harmonic gyro-TWT amplifier

Journal Article · Sat Jun 01 00:00:00 EDT 1996 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/27.533075· OSTI ID:377832

Chong, C K; McDermott, D B; Luhmann, Jr, N C; Wang, Q S ^[1]; Lin, A T ^[2]; DeHope, W J ^[3]

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1. Univ. of California, Davis, CA (United States). Dept. of Applied Science
2. Univ. of California, Los Angeles, CA (United States). Dept. of Physics
3. CPI, Palo Alto, CA (United States)

A low-magnetic-field moderate-voltage gyrotron amplifier has been designed for stable high-performance operation at 95 GHz. A slotted interaction circuit is utilized to achieve strong amplification near the third cyclotron harmonic frequency. The start-oscillation conditions were determined by an analytical theory (that will be described) and confirmed by a multimode particle-in-cell simulation code. The dominant threat to the amplifier`s stability is from a third-harmonic peniotron backward-wave interaction. A 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 {upsilon}{sub {perpendicular}}/{upsilon}{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: 377832
• Journal Information: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 3 Vol. 24; ISSN ITPSBD; ISSN 0093-3813
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPUTERIZED SIMULATION
CYCLOTRON FREQUENCY
DESIGN
ELECTRIC POTENTIAL
HARMONICS
MICROWAVE AMPLIFIERS
STABILITY