Electron Acceleration By The Use Of Segmented Cylindrical Electrodes In An Inverse Free Electron Laser

Abstract- In this paper we expend a theory of high gradient laser excited electron accelerator by the use of an inverse free-electron laser IFEL but with using new structure and design. The wiggler used in our scheme that is to say Paul wiggler is obtainedby segmented cylindrical electrodes with applied oscillatory voltagesVosc tover 90-degrees segments. The inverse free-electron laser interaction can be demonstrated by the equations that govern the electron motion in the composed fields of both laser pulse and Paul wiggler field. A numerical research of electron energy and electron trajectories has been made using fourth order Runge-Kutta method. The results show that the electron gains the maximum energy at a short distance for high wiggler amplitude intensities a0w. In addition it is discovered that the electron energy gains various peaks for different initial axial velocities. It is seen that aappropriate small initial axial velocity of e-beam produces remarkably high energy gain. According to the transverse limitation of the electron beam in a Paul wiggler there is no applied axial guide magnetic field in this devise.