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Sagan, D.

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MOOAKI01 Plans for Utilizing the Cornell Electron Storage Ring as a Test Accelerator for ILC Damping Ring Research and Development 42
  • M. A. Palmer, D. Sagan
    Cornell University, Department of Physics, Ithaca, New York
  • J. P. Alexander, D. L. Hartill, R. W. Helms, D. L. Rubin, J. P. Shanks, M. Tigner, J. T. Urban
    CLASSE, Ithaca
  • M. Ehrlichman
    University of Minnesota, Minneapolis, Minnesota
  • D. H. Rice
    CESR-LEPP, Ithaca, New York
  • L. Schachter
    Technion, Haifa
  Funding: Funding provided by NSF grant PHY-0202078

In April 2008, we propose to begin operation of the Cornell Electron Storage Ring (CESR) as a test accelerator, CesrTA, for International Linear Collider (ILC) damping ring research. Utilizing 12 damping wigglers, the baseline CesrTA lattice at 2.0 GeV will offer a natural geometric emittance of 2.25 nm. An experimental program has been laid out which focuses on several key areas of damping rings R&D. First we will test vacuum chamber designs to suppress electron cloud growth in the wiggler magnets. Secondly, we will develop correction, tuning and emittance monitoring strategies to achieve vertical emittances of a few picometers. As part of this effort we will validate alignment and survey techniques being developed by the Linear Collider Alignment and Survey group (LiCAS) for curved tunnel applications. After achieving ultra-low emittance, we intend to explore the impact of the electron cloud, the fast ion instability and other beam dynamics effects on ultra-low emittance beams. Finally, we plan to test various technical systems required for the ILC damping rings. This paper provides an update on conceptual design issues for CesrTA and describes the experimental program in detail.

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MOOBAB02 Progress Toward an ERL Extension to CESR 107
  • G. Hoffstaetter, I. V. Bazarov, G. W. Codner, M. Forster, S. Greenwald, Y. Li, M. Liepe, C. E. Mayes, C. K. Sinclair, C. Song, A. Temnykh, M. Tigner, Y. Xie
    CLASSE, Ithaca
  • D. H. Bilderback, D. S. Dale, K. Finkelstein, S. M. Gruner
    CHESS, Ithaca, New York
  • B. M. Dunham
    Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
  • D. Sagan
    Cornell University, Department of Physics, Ithaca, New York
  Funding: Supported by Cornell University and NSF grant PHY 0131508

The status of plans for an Energy-Recovery Linac (ERL) X-ray facility at Cornell University is described. Currently, Cornell operates the Cornell High Energy Synchrotron Source (CHESS) at the CESR ring and the ERL is planned to be an extension to the CESR ring with the addition of a 5-GeV superconducting c.w. linac. Topics covered in this paper include the full layout on the Cornell campus, the different operation modes of the accelerator, methods to limit emittance growth, control of beam-ion effects and ways to limit transverse instabilities. As an upgrade of the CESR ring, special attention is given to reuse of many of the existing components. The very small electron-beam emittances would produce an x-ray source that is highly superior than any existing storage-ring light source. The ERL includes 18 X-ray beamlines optimized for specific areas of research that are currently being defined by an international group of scientists. This planned upgrade illustrates how other existing storage rings could be upgraded to work as ERL light sources with vastly improved beam qualities and with limited dark time for x-ray users.

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