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Crittenden, J. A.

Paper Title Page
TUPAS056 Compensation Strategy for Optical Distortions Arising from the Beam-Beam Interaction at CESR 1778
 
  • J. A. Crittenden
    Cornell University, Department of Physics, Ithaca, New York
  • M. G. Billing
    CESR-LEPP, Ithaca, New York
  
  Funding: National Science Foundation grant PHY-0202078

Following two decades of operation at 5 GeV beam energy for studies of bottom quark bound states, the Cornell Electron Storage Ring (CESR) converted to 2 GeV operation in 2001 for the purpose of investigating bound states of charm quarks. This reduction of beam energy resulted in increased relative contributions of the beam-beam force. The beam-beam interaction has been found to have considerable consequences for the optics and for the injection aperture. We describe recent developments in our modelling of the beam-beam interaction, experimental validation techniques, and investigations into compensation strategies.

 
THPMS011 Design Considerations and Modeling Results for ILC Damping Ring Wigglers Based on the CESR-c Superconducting Wiggler 3014
 
  • J. A. Crittenden
    Cornell University, Department of Physics, Ithaca, New York
  • M. A. Palmer, J. T. Urban
    CLASSE, Ithaca
  
  Funding: Funding provided by NSF grant PHY-0202078

The ILC damping rings require wiggler magnets with large physical aperture and with excellent field quality to maintain the dynamic aperture of the rings. We consider two possible designs derived from the wigglers presently in operation at the Cornell Electron Storage Ring. Design optimization has been performed based on detailed tracking calculations of dynamic aperture and tune footprint in a full model of the damping ring. Results of finite-element modeling, transfer functions, and the accuracy of analytic models of the wiggler field will be discussed.