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Large-signal operation of a third-harmonic slotted gyro-TWT amplifier

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3 Author(s)
Chong, C.K. ; Dept. of Appl. Sci., California Univ., Davis, CA, USA ; McDermott, D.B. ; Luhmann, N.C., Jr.

The large-signal characteristics are reported for a slotted third-harmonic gyrotron traveling-wave tube (gyro-TWT) amplifier. The slotted interaction circuit yields strong harmonic interaction for relatively low-energy axis-encircling electrons. The circuit was sliced to suppress competing modes by interrupting their wall currents. The experiment was conducted in the X-band as a scaled test of a 95-GHz amplifier design developed in collaboration with CPI/Varian. A gyroresonant RF accelerator was employed to produce the required axis-encircling electron beam. The two-stage slotted third-harmonic gyro-TWT with a beam current equal to 60% of the design value was stable and yielded an output power of 6 kW with 5% efficiency and 11-dB saturated gain over a bandwidth of 3%

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Plasma Science, IEEE Transactions on  (Volume:26 ,  Issue: 3 )