Beam dynamics during longitudinal bunch compression of high-current heavy-ion beams

Dynamics of high-current heavy-ion beams are studied during longitudinal bunch compression. Operation regions of particle beams are plotted on a tune depression–wave velocity diagram. Emittance growth due to the transverse focusing field error is investigated during the final beam bunching. The beam bunch is longitudinally compressed during the transport with the field error in continuous focusing (CF) or alternating gradient (AG) field lattices. Numerical calculation results show the difference of the emittance growth is only 2% between the cases with and without field error in the CF lattice. On the other hand, in the case of AG lattice with field error of 10%, the emittance growth of 2.4 times is estimated. The beam behaviors in the CF and AG lattice transport are discussed based on the numerical simulations.