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Cravey, M.

Paper Title Page
RPAT062 Design and Operation of a Radiative Bhabha Luminosity Monitor for CESR-c 3564
 
  • M.A. Palmer, D. L. Rubin, J.C. Smith
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
  • M. Cravey, J. Napalitano
    RPI, Troy, New York
  • V. Crede
    Cornell University, Department of Physics, Ithaca, New York
  • K.L. Dooley
    Vassar, Poughkeepsie, New York
  • H. Vogel
    CMU, Pittsburgh, Pennsylvania
 
  Funding: Work supported by the National Science Foundation.

The CLEO-c experiment at the Cornell Electron Storage Ring (CESR) is presently embarking on a multi-year exploration of charm and QCD physics in the 3-5 GeV center-of-mass energy range. In order to facilitate rapid optimization of machine parameters over this energy range, a luminosity monitor based on the measurement of radiative-bhabha photons coming from the CLEO-c interaction point (IP) has been designed and installed in the CESR ring. Key design criteria of the device include: better than 1% statistical measurements of the luminosity with a 1 Hz update rate over the full range of CESR-c operating conditions; bunch-by-bunch measurement capability; a large horizontal aperture to enable measurements under conditions ranging from single-bunch head-on collisions to multi-bunch collisions with a horizontal crossing angle of up to 4~mrad; and, a segmented readout to provide direct information on beam characteristics at the IP. We review the design and performance of this device and discuss its application to machine tuning and performance studies.