Y. Xu et al., 3-DIMENSIONAL NONLINEAR-ANALYSIS OF AN EXB DRIFTING ELECTRON LASER, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 407(1-3), 1998, pp. 490-493
In this paper we numerically investigate the nonlinear evolution of th
e E x B drifting electron laser (DEL) [1,2] for an amplifier configura
tion in which an electron beam propagates through a periodic magnetic
field (wiggler) and undergoes a relativistic E x B drift in orthogonal
static electric and magnetic fields. A set of coupled nonlinear diffe
rential equations is given in three dimensions which controls the self
-consistent evolution of TE modes in a rectangular waveguide as well a
s the trajectories of an ensemble of electrons. Our numerical simulati
ons are conducted to model a 35 GHz amplifier with an electron beam en
ergy of 3.5 MeV. The results show that the radiation energy in the DEL
mainly comes from the change in the kinetic energy of the electron be
am, and the DEL, compared with the free-electron laser (FEL) with simi
lar operating parameters, has higher interaction efficiency and peak p
ower. (C) 1998 Elsevier Science B.V. All rights reserved.