1. Design of a W-band T[E.sub.01] mode gyrotron traveling-wave amplifier with high power and broad-band capabilities
- Author
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McDermott, David B., Song, Heather H., Hirata, Yosuke, Lin, Anthony T., Barnett, L.R., Chang, T.H., Hsu, Hsin-Lu, Marandos, Peter S., Lee, J.S., Chu, Kwo Ray, and Luhmann, N.C., Jr.
- Subjects
Beam optics ,Business ,Chemistry ,Electronics ,Electronics and electrical industries - Abstract
A high-power gyrotron traveling-wave amplifier operating in the low-loss T[E.sub.01] mode has been constructed at the University of California, Davis that will be driven by a 100-kV, 5-A electron beam with a pitch angle ([v.sub.[perpendicular to]]/ [v.sub.z]) of unity and velocity spread of 5%. The amplifier is predicted by large-signal simulations to generate 140 kW at 92 GHz with 28% efficiency, 50-dB saturated gain and 5% bandwidth. The stability of the amplifier from oscillation has been investigated with linear codes. The threshold current for the absolute instability of the T[E.sub.01] operating mode for the chosen operating parameters is predicted to be 10 A. To suppress the potential gyro-backward-wave oscillator interactions, the interaction circuit with a cutoff frequency of 91 GHz has been loaded with distributed loss so that the single-pass attenuation is 90 dB at 93 GHz. The coaxial input coupler has a predicted and measured coupling of 1 and 2 dB, respectively. Index Terms--Absolute instability, coaxial input coupler, distributed loss, gyro-backward-wave oscillator (BWO), gyro-traveling-wave tube (TWT) amplifier, gyrotron traveling-wave amplifier, magnetron injection gun (MIG).
- Published
- 2002