Computational studies of collective beam dynamics in high intensity rings

Collective interactions of the beam with itself and with its periodic lattice surroundings in high intensity accelerator rings, such as PSR and SNS, can lead to beam growth, halo generation, and losses. These interactions also provide a rich source of dynamic phenomena for analytical, computational, and experimental study. With continuing increases in model development and computer power, a number of sophisticated codes are now capable of detailed realistic studies of collective beam dynamics in rings. We concentrate here on a computational examination of high intensity beam dynamics in SNS. These studies include the effects of the accelerator lattice, space charge, impedances, losses and collimation, and magnet errors.