Plasma Physics Seminar ( Phys 769)

Dr. Mark Walter, IREAP, University of Maryland Status of the University of Maryland Electron Ring (UMER): Ring Closure and the Dawn of Multi-turn Operation The UMER beam path is now a complete 3600 circle. The last four ring sections have been installed and electron beam tests have begun. The UMER beam may be operated over a wide range of emittance dominated or space charge dominated regimes by adjusting the beam current up to 100 mA. The beam energy is 10 keV. The pulse duration may be adjusted up 100 ns. The beam is confined within the ring by a lattice of 72 focusing/defocusing quadrupoles while beam steering is achieved with regularly spaced dipole magnets. Primary diagnostics include phosphorous screens, capacitive beam position monitors, and pepperpot and slit-collector emittance measurement equipment. This presentation will provide an overview of the UMER with an emphasis on ring design, electron beam diagnostics, and continuing experimental efforts to achieve multi-turn operation. This work is supported by the DOE under grant numbers DE-FG02-94ER40855 and DE-FG02-92ER54178.