A SELF-CONSISTENT FIELD THEORY AND SIMULATION FOR COMPLEX CAVITY GYROTRON WITH ABRUPT TRANSITION
LI HONG\|FU\ DU PIN ZHONG\ YANG SHI WEN XIE ZHONG LIAN\ ZHOU XIAO LAN\ WAN HONG RONG\ HUANG YONG (Research Institute of High Energy Electronics, University of Electronic Science and Technology of China,Chengdu\ 610054)
A self\|consistent nonlinear theory of interaction between electron beam and RF field in a complex cavity gyrotron with abrupt transition is studied in this paper.A field matching technique is used to treat mode conversion at the step in cavity.Starting from general transmission line equations with an electron beam source,the nonlinear theory of interaction is investigated in which mode coupling is taken into account in diameter\|gradual\|change sections.Using the theoretical model,the electron beam interaction with H 51 ? ? 52 RF field in the third\|harmoric complex cavity gyrotron is simulated mumerically in detail.Many interest results are obtained.The results show that an electron efficiency over 25% is predicted for suitable dimensions of the complex cavity.