Simulation studies on matching of space-charge-dominated beams for the University of Maryland Electron Ring

The physics of space-charge-dominated beams with very large tune shift has never been explored in existing machines. The University of Maryland Electron Ring (UMER), currently under construction, will study the nonlinear physics characteristics of intense space-charge-dominated beams on a scaled basis. The unique features of UMER challenge us to design the beam optics carefully. One of the most important issues is to match the beam from the electron gun through the injector into the ring lattice. This is the major topic of this paper. The physics background, matrix and linear envelope-code computations, and particle-in-cell simulations of beam transport over a long propagation distance in UMER are presented.