Paper  Title  Page 

TUPAS056  Compensation Strategy for Optical Distortions Arising from the BeamBeam Interaction at CESR  1778 


Funding: National Science Foundation grant PHY0202078 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 beambeam force. The beambeam 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 beambeam interaction, experimental validation techniques, and investigations into compensation strategies. 

THPMS011  Design Considerations and Modeling Results for ILC Damping Ring Wigglers Based on the CESRc Superconducting Wiggler  3014 


Funding: Funding provided by NSF grant PHY0202078 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 finiteelement modeling, transfer functions, and the accuracy of analytic models of the wiggler field will be discussed. 