Beam dynamics simulations of the University of Maryland Electron-Ring Project

A 3-D particle-in-cell code, WARP, is being used to study the self-consistent nonlinear dynamics of the space-charge-dominated beam in the University of Maryland E-ring project. Early work was concentrated on general studies of beam propagation in the nominal ring lattice, as well as more detailed calculations in the injector transport line. Simulations of the ring lattice are being used to address fundamental questions such as emittance growth, which can be caused by nonlinearities in the focusing elements, as well as distortions in the beam equilibrium by the bends. A preliminary design of the injector matching section is presented. Simulations of the injector section emphasize the relationship between the predictions of numerical models and the experimental measurements, in order to understand the requirements for adequately modeling the specific focusing elements used.