Wave growth rate in a cylindrical metal waveguide with ion-channel guiding of a relativistic electron beam  

作　　者：李海容 唐昌建 王顺金 

机构地区：[1]School of Physics Science and Technology,Sichuan University [2]College of Science,University of Science and Technology Liaoning

出　　处：《Chinese Physics B》2010年第12期234-241,共8页中国物理B（英文版）

基　　金：Project supported in part by the National Natural Science Foundation of China (Grant Nos. 10775100 and 90503008);the Science Foundation of China Academy of Engineering Physics (Grant No. 10576019);the Fund of Theoretical Nuclear Physics Center,National Laboratory of Heavy Ion Accelerator Facility of Lanzhou

摘　　要：This paper addresses the formulae and numerical issues related to the possibility that fast wave may be grown when a relativistic electron beam through an ion channel in a cylindrical metal waveguide. To derive the dispersion equations of the beam-wave interaction, it solves relativistic Lorentz equation and Maxwell＇s equations for appropriate boundary conditions. It has been found in this waveguide structure that the TM0m modes are the rational operating modes of coupling between the electromagnetic modes and the betatron modes. The interaction of the dispersion curves of the electromagnetic TM0m modes and the upper betatron modes is studied. The growth rates of the wave are obtained, and the effects of the beam radius, the beam energy, the plasma frequency, and the beam plasma frequency on the wave growth rate are numerically calculated and discussed.This paper addresses the formulae and numerical issues related to the possibility that fast wave may be grown when a relativistic electron beam through an ion channel in a cylindrical metal waveguide. To derive the dispersion equations of the beam-wave interaction, it solves relativistic Lorentz equation and Maxwell＇s equations for appropriate boundary conditions. It has been found in this waveguide structure that the TM0m modes are the rational operating modes of coupling between the electromagnetic modes and the betatron modes. The interaction of the dispersion curves of the electromagnetic TM0m modes and the upper betatron modes is studied. The growth rates of the wave are obtained, and the effects of the beam radius, the beam energy, the plasma frequency, and the beam plasma frequency on the wave growth rate are numerically calculated and discussed.

关 键 词：relativistic electron beam PLASMA ion channel dispersion relations wave growth rate 

分 类 号：TN252[电子电信—物理电子学]