Design and Simulation Investigations of Stagger-Tuned W-Band Gyro-Twystron

In the present article, a multi-cavity W-band gyro-twystron amplifier operating in fundamental TE 01 mode has been designed, investigated for its beam-wave interaction behavior, and its performance has been enhanced by optimizing a diode type electron gun with a nominal velocity spread and stagger-t...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2022-02, Vol.69 (2), p.777-784
Main Authors: Yadav, Shyam Gopal, Akash, Thottappan, M.
Format: Article
Language:English
Subjects:
Amplifiers
Bandwidth
Electron beams
Electron guns
Electron optics
Energy conversion efficiency
Gain
Gyro-twystron
Holes
magnetron injection gun (MIG)
millimeter-wave amplifier
Oscillators
Particle in cell technique
particle-in-cell (PIC) code
Power generation
Radio frequency
stagger-tuning technique
Tuning
W-band operation
Wave interaction
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Summary:In the present article, a multi-cavity W-band gyro-twystron amplifier operating in fundamental TE 01 mode has been designed, investigated for its beam-wave interaction behavior, and its performance has been enhanced by optimizing a diode type electron gun with a nominal velocity spread and stagger-tuning technique. The particle-in-cell simulation of the present gyro-twystron has predicted a peak RF output power of ~84 kW with a saturated gain of ~37 dB. The use of staggered RF cavities improved the bandwidth up to 1.5 GHz, which was found to be 2.5 times more than the synchronously tuned W-band gyro-twystron. The power conversion efficiency of the present stagger-tuned amplifier has been calculated as ~22%. A single anode magnetron injection gun has been designed and modeled to form the gyrating electron beam with 65 kV, 6 A, and 4% velocity spread by using 2-D electron optics code. A collector with an effective collecting area and an output window have been designed and studied to extract the remaining energy of spent electrons and collect the RF power from the vacuum environment, respectively.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2021.3137366