Proposal for a beam swinger

A beam swinger is described which will permit the angle of incidence of particle beams onto a target to be varied from 0deg to +30deg. For symmetry checks the beam can also be swung to approximately -5deg. Neutron detectors placed at 0deg, 30deg, 60deg and 90deg will then permit angular distributions to be measured using conventional time-of-flight methods, but without changing detector angle. The device requires two dipoles, bending the beam in opposite directions, together with a dump magnet. The design is intended to permit the largest of the dipoles to remain at a fixed field setting for a given particle energy, so that the angle of incidence is determined by the field of the first magnet alone. (author)