AbstractA small electron ring is being designed at the University of Maryland for studies of space-charge-dominated beams in rapid-cycling rings and recirculating accelerator systems. The motivation and general features of the ring are given in an accompanying paper. In this paper we describe the electron gun, matching section and pulsed inflector. One solenoid and five quadrupoles will be used for the matching section. This section will also serve as an experimental test bed for the printed-circuit quadrupoles and, in part, the lattice design. Our preliminary design for the injector system is based on pulsed, single-turn injection of the full beam current located at one of 36 ring dipoles. A pulsed, Panofsky quadrupole replaces one of the ring quadrupoles to accomodate the injection line. The low energy and small fields enable reasonable voltage and current for these iron-free components, but require careful compensation for external fields, including the earth's field.
A controllable electron injector based on ponderomotive acceleration of electrons inside the wakefield