Alignment and Steering for Injection and Multi-Turn Operation of the University of Maryland Electron Ring (UMER)

The injection line and main lattice for the University of Maryland Electron Ring (UMER) has been completed. The electron beam has completed more than three full turns of the ring. Beam steering and matching in the injection line are achieved with six quadrupole magnets and several small steering dipole magnets. The dipole component of an offset quadrupole and a pulsed dipole are combined to achieve the 10 degree bend required from the injection line into the ring. The pulsed dipole is designed to operate with a short pulse (2 kV, - 30 A, 100 ns flat top duration) for injection superimposed on a long pulse (300 V, 15 A, 20e-6 s duration) for multiple beam passes. The beam is controlled in the recirculating ring with a regular lattice of 35 dipole and 72 quadrupole magnets. Initial experimental results of the beam transport and control are presented.