High power folded waveguide millimeter-wave gyro-TWT

Conference · Sat Dec 31 00:00:00 EST 1994

OSTI ID:51753

Choi, J J ^[1]; Ganguly, A K ^[2]; Armstrong, C M ^[3]

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1. Science Applications International Corp., McLean, VA (United States)
2. Omega-P Inc., New Haven, CT (United States)
3. Naval Research Lab., Washington, DC (United States)

Investigations on a periodic TE serpentine waveguide gyro-TWT are underway at NRL. A high power axis-encircling electron beam interacts with a fundamental TE waveguide mode when it passes through an oversized beam tunnel hole in the narrow wall of the H-plane bend rectangular serpentine waveguide. Potential advantages of the circuit configuration include: easy fabrication, fundamental forward space harmonic operation, large beam tunnel suitable for high power application, natural separation of beam and rf, and simplicity of coupling. To avoid bandwidth reduction due to closely spaced stop-bands and large gap detuning angle, a double rigid TE folded waveguide structure is proposed. To utilize the entire bandwidth, it is necessary to suppress gyro-BWO oscillation at the higher space harmonics. Linear theory predicts that oscillation takes place at {approximately} 7 cm near the stop-band frequency. Therefore, a multi-stage configuration is required to saturate the device without oscillations. An experiment is underway at NRL to verify the negative mass instability in both fast and slow wave regions in a transverse folded waveguide structure and to investigate the basic circuit stability characteristics. Design parameters of the amplifier, large signal simulations using a MAGIC code and cold-test results of the circuit components will be presented.

• OSTI ID: 51753
• Report Number(s): CONF-940604-; ISBN 0-7803-2006-9; TRN: IM9524%%221
• Resource Relation: Conference: 1994 Institute of Electrical and Electronic Engineers (IEEE) international conference on plasma science, Santa Fe, NM (United States), 6-8 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of IEEE conference record -- Abstracts; PB: 252 p.
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
TRAVELLING WAVE TUBES
DESIGN
PERFORMANCE TESTING
OSCILLATION MODES
M CODES
COMPUTERIZED SIMULATION
USES