SPACE CHARGE WAVES AS A DIAGNOSTIC TO MEASURE TRANSVERSE BEAM SIZE OF SPACE CHARGE DOMINATED BEAMS

Intense charged particle beams are of great interest to many wide areas of application ranging from high-energy physics, light sources and energy recovery linacs, to med-ical applications. The University of Maryland Electron Ring (UMER) is a scaled model to investigate the physics of such intense beams. It uses a 10 keV electron beam along with other scaled beam parameters that model the larger machines but at a lower cost. Multi turn opera-tion of the ring (3.6 m diameter) has been achieved for highly space charge dominated beams. Such, multi-turn operation requires a non-intercepting diagnostic for mea-suring the transverse beam size. Localized density or ve-locity variations on a space-charge dominated beam travel as space charge waves along the beam. The speed at which the space charge waves separate from each other depends on the beam current, energy and g-factor. In this work, we propose a diagnostic using deliberately-induced space charge waves to measure the beam size with multi-turn op-eration. We present and compare experimental results with self-consistent simulation