• J.A. Crittenden, M.G. Billing
  Cornell University, Department of Physics, Ithaca, New York
• D. L. Rubin
  Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York

The CESR storage ring facility has begun operation in an energy region which allows high-statistics investigation of charm-quark bound states. Experience during the first year has shown that the effects of parasitic crossings in the pretzel orbits present an important factor in injection efficiency, in the beam lifetime and stored current limits. We compare the results of beam dynamics and tracking calculations which quantify the effects of these parasitic crossings on optics and dynamic aperture for the injected and stored trajectories to observations of beam behavior.

• 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

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.

• R.W. Helms, D. L. Rubin
  Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York

Current specifications for the International Linear Collider call for bunch trains hundreds of kilometers in length. We describe a scheme for manipulating a compressed bunch train in the damping ring using RF deflectors and multiple transfer lines. The concept is demonstrated in the design of a 4 km damping ring that circulates 2800 bunches spaced 4 ns apart, and we show that injection and extraction of individual bunches is possible with conventional kickers requiring rise/fall times of only 16 ns. The performance and stability of the 4 km damping ring is evaluated and compared with existing machines.

• J.C. Smith, L. Gibbons, J.R. Patterson, D. L. Rubin
  Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
• D. Sagan
  Cornell University, Department of Physics, Ithaca, New York
• P. Tenenbaum
  SLAC, Menlo Park, California

The International Linear Collider (ILC) alignment tolerances require more sophisticated alignment techniques than those provided by survey alone. Various Beam-Based Alignment algorithms have been proposed to achieve the desired low emittance preservation. These algorithms are compared and their merits identified using the TAO accelerator simulation program.