Large-signal characteristics of a wide-band dielectric-loaded gyro-TWT amplifier

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

DOI:https://doi.org/10.1109/27.533073· OSTI ID:377830

Leou, K C ^[1]; McDermott, D B; Luhmann, Jr, N C ^[2]

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1. Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering
2. Univ. of California, Davis, CA (United States). Dept. of Applied Science

The bandwidth of a gyrotron traveling wave amplifier (gyro-TWT) has been significantly increased by partially filling the interaction waveguide with dielectric to reduce the circuit`s dispersion. The proof-of-principle experiment was designed for X-band, and employs the fundamental mode of rectangular waveguide loaded with dielectric slabs along the narrow sidewalls. The amplifier yields a peak output power of 55 kW with 11% efficiency, 27 DB saturated gain, and an unprecedented untapered gyro-TWT constant-drive bandwidth of 11% and saturated bandwidth exceeding 14%. The single-stage amplifier is completely zero-drive stable. The 95-kV 5-A electron beam was produced by a single-anode magnetron injection gun with {upsilon}{sub {perpendicular}}/{upsilon}{sub z} = 0.6, as determined by the EGUN code, and {Delta}{upsilon}{sub z}/{upsilon}{sub z} = 4%, determined as the best fit to the gyro-TWT large-signal simulation data. Simulation studies predict that by lowering the velocity spread to {Delta}{upsilon}{sub z}/{upsilon}{sub z} = 2%, the amplifier performance will be further enhanced to a constant-drive bandwidth of 20% with 15% efficiency.

• OSTI ID: 377830
• 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
DESIGN
DIELECTRIC MATERIALS
ELECTRON GUNS
MICROWAVE AMPLIFIERS
PERFORMANCE