Impact of radial deviation of electron beam on backward wave oscillation in helix TWT

In this study, the impact of radial deviation of the electron beam on backward wave oscillation (BWO) in a helix travelling wave tube (TWT) is explored. By using CST simulation, the output power of a helix TWT with the electron beam deviation of 0.01 mm is obtained and compared with that of a normal...

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Published inJournal of engineering (Stevenage, England) Vol. 2018; no. 14; pp. 686 - 688
Main Authors Zhang, Jin, Yuan, Huiyu, Zhao, Xingqun, Bai, Ningfeng, Shen, Changsheng, Fan, Hehong, Sun, Xiaohan, Chen, Bo, Feng, Jinjun, Yan, Tiechang
Format Journal Article
LanguageEnglish
Published The Institution of Engineering and Technology 2018
Subjects
backward wave amplitude
backward wave oscillation
backward wave oscillators
backward wave signal
CST simulation
electron beam
electron beam deviation
electron beams
frequency 11.0 GHz
helix travelling wave tube
helix TWT
power 40.0 W
radial deviation
travelling wave tubes
electron beams
helix travelling wave tube
electron beam
CST simulation
backward wave amplitude
backward wave oscillation
helix TWT
backward wave signal
electron beam deviation
backward wave oscillators
power 40.0 W
radial deviation
frequency 11.0 GHz
travelling wave tubes
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Summary:In this study, the impact of radial deviation of the electron beam on backward wave oscillation (BWO) in a helix travelling wave tube (TWT) is explored. By using CST simulation, the output power of a helix TWT with the electron beam deviation of 0.01 mm is obtained and compared with that of a normal TWT. We found that the output power of the helix TWT changes by 40 W. By analysing the backward wave signal when the TWT works at 11 GHz for different values of the radial deviation of the electron beam, we found that the backward wave amplitude increases as the radial deviation of the electron beam increases. When the radial deviation reaches 0.04 mm (9.5% relative to the electron beam), the backward wave starts to oscillate. When the radial deviation reaches 0.06 mm (14.3% relative to the electron beam), the BWO becomes more severe. It has been proved that the radial deviation of the electron beam is one of the contributing factors for BWO in the helix TWT.
ISSN:2051-3305
2051-3305
DOI:10.1049/joe.2018.0097