FAST DAMPING IN BEAM ENVELOPE OSCILLATION AMPLITUDES OF MISMATCHED HIGH INTENSITY BEAMS

Recently, a very fast damping of beam envelope oscillation amplitudes has been observed in simulations of high intensity beams transportation through periodic FODO cells, in mismatched conditions [1,2]. In those references, a guess on the possible mechanism that causes the damping effect has also been proposed. It seemed that the damping could be ascribed to a Landau damping mechanism. In this presentation, further simulations, which seem confirm that the fast damping is due to the Landau damping effect, will be shown and discussed with more details.