Wiggler-based electron beam microbunching amplifier study

Abstract

The wiggler-based amplifier of the microbunching instability in the electron beam is considered and compared to a longitudinal space charge amplifier consisting of the drifts and chicanes. The gain in the magnitude of a seed perturbation of the electron beam density is evaluated analytically as a function of the period of the perturbation, the electron beam parameters, the wiggler parameters, and the amplifier lattice parameters. The theory is compared with the results of the numerical calculations of the gain based on simulations of the electron beam transport through the amplifier lattice.