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Palmer, M.A.

Paper Title Page
MOPLS042 Longitudinal Beam Stability for CESR-c 634
 
  • R. Holtzapple, J.S. Kern, P.J.S. Stonaha
    Alfred University, Alfred, New York
  • B. Cerio
    Colgate University, Hamilton, New York
  • M.A. Palmer
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
 
  The Cornell Electron-Positron Storage Ring (CESR) operates at 1.9 GeV per beam for high energy physics collisions. To maintain high luminosity it is essential for the bunch trains to be longitudinally stable. Measurements of longitudinal stability with a single, multiple, and colliding trains have been performed using a dual sweep streak camera and are presented in this paper.  
MOPLS141 The Proposed Conversion of CESR to an ILC Damping Ring Test Facility 891
 
  • M.A. Palmer, R.W. Helms, D. L. Rubin, D. Sagan, J.T. Urban
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
  • M. Ehrlichman
    University of Minnesota, Minneapolis, Minnesota
 
  In 2008 the Cornell Electron Storage Ring (CESR) will end nearly three decades of providing electron-positron collisions for the CLEO experiment. At that time it will be possible to reconfigure CESR as a damping ring test facility, CesrTF, for the International Linear Collider (ILC) project. With its complement of 12 damping wigglers, CesrTF will offer horizontal emittances in the few nanometer range and, ideally, vertical emittances approaching those specified for the ILC damping rings. An important feature of the CesrTF concept is the ability to operate with positrons or electrons. Positron operation will allow detailed testing of electron cloud issues critical for the operation of the ILC positron damping rings. Other key features include operation with wigglers that meet or exceed all ILC damping ring requirements, the ability to operate from 1.5 to 5.5 GeV beam energies, and the provision of a large insertion region for testing damping ring hardware. We discuss in detail the CesrTF machine parameters, critical conversion issues, and experimental reach for damping ring studies.  
MOPLS142 Optimization of CESR-c Superferric Wiggler for the International Linear Collider Damping Rings 894
 
  • J.T. Urban, G. Dugan, M.A. Palmer
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
 
  We present the results of an optimization of the Cornell Electron Storage Ring (CESR) superferric wiggler for the International Linear Collider (ILC) damping ring. The superferric CESR wiggler has been shown to have excellent beam dynamics properties in the ILC damping ring. We reduced the physical size, and hence cost, of the CESR wiggler with minimal degradation of ILC damping ring beam dynamics. We will provide a description of the optimized superferric wiggler and show the performance of this wiggler in the ILC baseline damping ring.  
TUPCH097 Instrumentation and Operation of a Remote Operation Beam Diagnostics Lab at the Cornell Electron-positron Storage Ring 1238
 
  • R. Holtzapple, J.S. Kern, P.J.S. Stonaha
    Alfred University, Alfred, New York
  • B. Cerio
    Colgate University, Hamilton, New York
  • M.A. Palmer
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
 
  Accelerator beam diagnostics are being modified at the Laboratory of Elementary Particle Physics (LEPP) at Cornell University for remote operation at nearby Alfred University. Presently, a streak camera used for longitudinal dynamics measurements on the Cornell Electron-Positron Storage Ring (CESR) is operational and measurements have been made from Alfred University [1]. In the near future, photomultiplier tube arrays for electron and positron vertical beam dynamics measurements will be remotely operated as well. In this paper, we describe instrumentation and operation of the remote beam diagnostics.  
THPCH148 Tests of a High Voltage Pulser for ILC Damping Ring Kickers 3137
 
  • M.A. Palmer, G. Dugan, D. L. Rubin
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
  • R. Meller
    Cornell University, Department of Physics, Ithaca, New York
 
  The baseline configuration for the International Linear Collider (ILC) damping rings specifies a single 6 km damping ring for electrons and two 6 km rings for positrons. Kicker requirements are determined by the damping ring circumference and the train structure in the main linac. The nominal bunch train parameters in the ILC main linac are trains of 2820 bunches with 308 ns spacing and a train repetition rate of 5 Hz. This means that the pulsers for the damping ring kickers must have rise and fall times suitable for bunch spacings of ~6 ns, must be able to operate with 3.25 Mhz bursts, and must support an average pulse rate of 14.1 kHz. We describe bench and beam tests of a pulser based on fast ionization dynistor technology whose specifications roughly meet these requirements. We then discuss the implications of our results for the ILC damping ring kickers.