Rippled-beam free-electron laser

Description

This item was taken from the IEEE Conference ' Rippled-beam free-electron laser ' We describe a new microwave generation mechanism involving a scalloping annular electron beam. The beam interacts with the axial electric field of a TM/sub 02/ mode in a smooth circular waveguide through the axial free-electron laser interaction, in which the beam ripple period is synchronous with the phase slippage of the RF mode relative to the electron beam. Due to nonlinearities in the orbit equation, the interaction can be made autoresonant, where the phase and amplitude of the gain is independent of the beam energy.