Design of a W-band TE sub(01) mode gyrotron traveling-wave amplifier with high power and broad-band capabilities

A high-power gyrotron traveling-wave amplifier operating in the low-loss TE 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 ( upsilon sub([bottom])/ upsilon sub(z)) of unity and velocity spread of 5%. The...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2002-01, Vol.30 (3)
Main Authors: McDermott, D B, Song, H H, Hirata, Y, Lin, A T, Barnett, L R, Chang, TH, Hsu, Hsin-Lu, Marandos, P S, Lee, J S, Ray Chu, Kwo, Luhmann, NC Jr
Format: Article
Language:English
Subjects:
Amplifiers
Gyrotrons
Joining
Noise levels
Oscillations
Pitch angle
Spreads
Stability
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Summary:A high-power gyrotron traveling-wave amplifier operating in the low-loss TE 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 ( upsilon sub([bottom])/ upsilon 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 TE 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.
ISSN:0093-3813
DOI:10.1109/TPS.2002.801559