Operational Studies of the 10 keV Electron Storage Ring UMER

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The University of Maryland Electron Ring (UMER) is now operational. UMER can operate with currents from 0.6 mA to 100 mA, ranging from the emittance dominated to the heavily space charge dominated regimes. Multiple turns have been achieved at all operating currents, from 250 turns at 0.6 mA to about 12 turns at 100 mA, but not yet optimized for operation above 25 mA. Machine development in the past year has been on understanding the single particle behavior in order to establish a strong basis for studying the effects of space charge. The effect of the earth's field has been studied and compensation implemented. Basic machine parameters such as the tune, equilibrium orbit, chromaticity and dispersion have been measured over a range of currents. We report here on these measurements and corresponding simulations. ©2009 American Institute of Physics