Halo Formation and Emittance Growth during Bunch Compression of High-current Heavy Ion Beams

A generation of halo particles and an emittance growth are investigated numerically for a highcurrent beam transport during a longitudinal bunch compression. The halo particles are generated during the drift compression with an alternating gradient confinement lattice in the transverse direction. The emittance growth is caused by the halo particle generation, and depends on the drift length for the bunch compression. The orbit of generated halo particles extends outward with the beam current increase. The initial particle distribution affects the halo particle generation after the drift beam transport.