EFFECT OF BEAM DENSITY ON NONLINEAR AMPLIFICATION OF INVERSE-BREMSSTRAHLUNG ELECTRON ACCELERATION

An electromagnetic particle-in-cell simulation code is used to investi gate particle density effects on the nonlinear amplification of invers e-bremsstrahlung electron acceleration, according to the schemes propo sed by Kawata et al. and by Hussein and Pato. It is shown that althoug h the space-charge self-consistent field does not modify the basic res ults obtained with the one-particle model, the electromagnetic fields produced by the transverse particle current play a substantial role fo r large beam densities.