Injector for the University of Maryland Electron Ring (UMER)

The electron beam injector constructed by FM technologies for the Universit y of Maryland Electron Ring (UMER) program is described. The program will u se an electron beam to model space-charge-dominated ion beams in a recircul ating linac for heavy ion inertial fusion, as well as for high-current muon colliders. The injector consists of a 10 keV, 100 mA electron gun with 50- 100 nsec pulse width and a repetition rate of 120 Hz. The e-gun system incl udes a 6-mask, rotatable aperture plate, a Rogowski current monitor, an ion pump, and a gate valve. The injector beamline consists of a solenoid, a fi ve-quadrupole matching section, two diagnostic chambers, and a fast current monitor. An independent diagnostic chamber also built for UMER will be use d to measure horizontal and vertical emittance, current, energy, energy spr ead, and the evolution of the beam envelope and profile along the injector beamline. (C) 2001 Elsevier Science B.V. All rights reserved.