Open AccessBackward-wave oscillation in high power broadband helical traveling wave tube
Author(s) -
Yulu Hu,
Yang Zhong-hai,
Bin Li,
Jianqing Li,
Huang Tao,
Xiaolin Jin,
Xiaoli Zhu,
Liang Xian-Pu
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.5439
Subject(s) - oscillation (cell signaling) , physics , traveling wave tube , backward wave oscillator , beam (structure) , broadband , optics , power (physics) , space charge , nonlinear system , magnetic field , tube (container) , signal (programming language) , computational physics , cathode ray , electron , materials science , optoelectronics , amplifier , genetics , cmos , quantum mechanics , computer science , biology , programming language , composite material
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.