Abstract
The University of Maryland Electron Ring (UMER) requires a detailed knowledge of the energy spread of the beam. The evolution of energy spread in space-charge dominated beams is not well understood. There are several sources that cause the energy spread growth, such as the Boersch (1954) effect and the longitudinal-longitudinal relaxation effect. According to theoretical analysis, the energy spread should be a few eV, however this has not been verified. We plan to use a cylindrical energy analyzer, which has resolution of 0.5 eV, to measure the evolution of energy spread along a 2 m transport line with a 3-5 keV, 70-135 mA beam. The test beamline will have 3 short solenoids for matching into a long solenoid and 1 short solenoid for matching into the diagnostic chamber. Two energy analyzers will be used to measure energy spread at different positions in the transport line.
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