HALO FORMATION IN BREATHING ROUND BEAMS IN A PERIODIC FOCUSING CHANNEL

Halo formation in high-intensity axisymmetric beams in a periodic focusing channel is analyzed using particle-in-cell simulations. In order to explore self-consistently the fundamental properties of breathing round beams propagating in a periodic focusing channel, the initial phasespace distribution of a beam injected into a linac is adopted to be some sufficiently realistic distributions such as Gaussian, waterbag and parabolic. Numerical results such as halo intensity and emittance growth are obtained by means of multiparicle simulations.