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A 2D nonlinear beam-wave interaction is built to simulate the backward-wave oscillation(BWO) in a Helical traveling wave tube, based on the 1D beam-wave interaction model by taking into account the angular speed which is affected by magnetic field. The normalized oscillation start-up length with different space charge parameter is compared with that obtained from a equivalent circuit model in small signal, showing that they are close to each other. Also, the simulated results are in accordance with the measurements in a 8—18 GHz Helical TWT. The factors affecting the BWO are studied, by which some methods to suppress the BWO are improved.
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Keywords:
- helix TWT /
- backward-wave oscillation /
- nonlinear /
- beam-wave interaction simulator
[1] Pierce J R 1950 Traveling Wave Tubes ( New York: Van Nostrand)
[2] Gilmour A S Jr 1994 Principles of Traveling Wave Tubes( Norwood: Artechhouse) pp94—132
[3] Heffner H 1954 Proc. IRE 42 930
[4] Johnson H R 1955 Proc. IRE, 43 684
[5] Belyavskiy Eugene D, Goncharov Ilya A, Martynyuk Alexander E, Svirid Vladimir A, Khotiaintsev Sergei N, 2001 IEEE Trans. Electron. Devices 48 1727
[6] Antonsen T M Jr, Sefier Pedro, Chernin David P 2002 IEEE Trans. Plasma Sci. 30 1089
[7] Chernin David P, Antonsen T M Jr, Levush Baruch 2003 IEEE Tran. Electron. Devices 50 2540
[8] Li B, Yang Z H, Li J Q, Zhu X F, Huang T, Hu Q, Hu Y L, Ma J J, Liao L, Xiao L, He G X 2009 IEEE Trans. Electron Devices 56 919
[9] Hu Y L, Yang Z H, Li J Q, Li B, Gao P, Jin X L 2009 Acta Phys. Sin. 58 6665 (in Chinese) [胡玉禄、杨中海、李建清、李 斌、高 鹏、金晓林 2009 58 6665]
[10] Li J Q, Mo Y L 2006 Acta Phys. Sin. 55 4117(in Chinese)[李建清、莫元龙 2006 55 4117]
[11] Rowe J E 1979 Nonlinear Electron-wave Interaction Phenomena (Beijing: Science Press) p227 (in Chinese)
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[1] Pierce J R 1950 Traveling Wave Tubes ( New York: Van Nostrand)
[2] Gilmour A S Jr 1994 Principles of Traveling Wave Tubes( Norwood: Artechhouse) pp94—132
[3] Heffner H 1954 Proc. IRE 42 930
[4] Johnson H R 1955 Proc. IRE, 43 684
[5] Belyavskiy Eugene D, Goncharov Ilya A, Martynyuk Alexander E, Svirid Vladimir A, Khotiaintsev Sergei N, 2001 IEEE Trans. Electron. Devices 48 1727
[6] Antonsen T M Jr, Sefier Pedro, Chernin David P 2002 IEEE Trans. Plasma Sci. 30 1089
[7] Chernin David P, Antonsen T M Jr, Levush Baruch 2003 IEEE Tran. Electron. Devices 50 2540
[8] Li B, Yang Z H, Li J Q, Zhu X F, Huang T, Hu Q, Hu Y L, Ma J J, Liao L, Xiao L, He G X 2009 IEEE Trans. Electron Devices 56 919
[9] Hu Y L, Yang Z H, Li J Q, Li B, Gao P, Jin X L 2009 Acta Phys. Sin. 58 6665 (in Chinese) [胡玉禄、杨中海、李建清、李 斌、高 鹏、金晓林 2009 58 6665]
[10] Li J Q, Mo Y L 2006 Acta Phys. Sin. 55 4117(in Chinese)[李建清、莫元龙 2006 55 4117]
[11] Rowe J E 1979 Nonlinear Electron-wave Interaction Phenomena (Beijing: Science Press) p227 (in Chinese)
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