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Palmer, M. A.

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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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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.

THPAN087 Study of Turn-by-Turn Vertical Beam Dynamics at Low and High Energy CESR Operation 3423
  • R. Holtzapple, J. S. Kern
    Alfred University, Alfred, New York
  • G. W. Codner, M. A. Palmer, E. Tanke
    CESR-LEPP, Ithaca, New York
  Funding: This work was supported by the National Science Foundation.

Presently, CESR is operated at two different beam energies, low energy (E=2GeV) for high energy physics (CESR-c), and high energy (E=5.3GeV) for synchrotron radiation production (CHESS). The electron and positron bunches vertical dynamics at these two energies are vastly different, in part due to the change in the pretzel orbit, the presence of wiggler magnets at low energy, and synchrotron radiation power at two vastly different energies. Using the 32 channel photomultiplier array*, we measured the vertical beam dynamics on a turn-by-turn basis during CHESS and CESR-c operation as well as dedicated machine studies time. For these studies we quantify the electron cloud effects such as vertical tune shift and vertical beam size blow-up along the electron and positron trains at these two vastly different beam energies. In addition, the turn-by-turn capability of the PMT array allows us to study the vertical bunch dynamics over 10k turns.

* Design and Implementation of an Electron and Positron Multibunch Turn-by-Turn Vertical Beam Profile Monitor in CESR-PAC2007 proceedings

FRPMS047 Design and Implementation of an Electron and Positron Multibunch Turn-by-Turn Vertical Beam Profile Monitor in CESR 4081
  • M. A. Palmer, E. Tanke
    CESR-LEPP, Ithaca, New York
  • B. Cerio, R. Holtzapple, J. S. Kern
    Alfred University, Alfred, New York
  • J. Dobbins, D. L. Hartill, C. R. Strohman
    CLASSE, Ithaca
  • M. E. Watkins
    CMU, Pittsburgh, Pennsylvania
  Funding: This work is supported by the National Science Foundation.

A fast vertical beam profile monitor has been implemented at the Cornell Electron Storage Ring (CESR). Readout is based on the Hamamatsu H7260K multianode photomultiplier. This device has a 32 channel linear anode array with 1 mm channel pitch and sub-nanosecond rise time. It provides the ability to probe individual electron and position bunches which are separated by 14 ns within the trains in CESR. A custom 72 MHz digitizer unit allows synchronous multibunch and turn-by-turn data acquisition. An on-board digital signal processor provides local data processing capability. This system provides the capability to probe a range of single bunch and multibunch beam dynamics issues as well as machine stability issues. In this paper we describe the profile monitor hardware, data acquisition system, calibration of the profile monitor, and data analysis software.

FRXKI01 Superconducting Magnet Needs for the ILC 3732
  • J. C. Tompkins, V. S. Kashikhin
    Fermilab, Batavia, Illinois
  • J. A. Clarke
    Cockcroft Institute, Warrington, Cheshire
  • M. A. Palmer
    CLASSE, Ithaca
  • B. Parker
    BNL, Upton, Long Island, New York
  The ILC Reference Design Report will be completed early in 2007. The Magnet Systems Group was formed to translate magnetic field requirements into magnet designs and cost estimates for the Reference Design. As presently configured, the ILC will have more than 11,000 magnetic elements of which more than 1200 will be based on superconducting technology. This paper will describe the major superconducting magnet needs for the ILC as presently determined by the Magnet Systems Group and the leaders of the Area Systems Groups, responsible for beamline design. The superconducting magnet components include the Main Linac quadrupoles, the Positron Source undulators, the Damping Ring wigglers, and the complex array of Final Focus superconducting elements in the Beam Delivery System.  
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