Author: Strohman, C.R.
Paper Title Page
WEPPP077 Control of RF Transients in Cavities Induced by Pulsed High Current Beams 2891
 
  • F. Löhl, J. Dobbins, R.P.K. Kaplan, C.R. Strohman
    CLASSE, Ithaca, New York, USA
 
  Funding: Supported by NSF award DMR-0807731.
The Cornell ERL prototype injector is operated either in a cw or in a pulsed mode. In the latter case, the bunch trains, which have a duration of 100 ns to 10 microseconds and a beam current of up to 100 mA, generate transients in the RF cavity fields which severely distort the beam quality and cause beam loss. In this paper, we present a scheme we use to correct the fast transients based on an adaptive feed-forward method.
 
 
WEPPR015 Intrabeam Scattering Studies at CesrTA 2970
 
  • M. P. Ehrlichman
    Cornell University, Ithaca, New York, USA
  • F. Antoniou, Y. Papaphilippou
    CERN, Geneva, Switzerland
  • W. Hartung, M.A. Palmer, D.P. Peterson, N.T. Rider, D. L. Rubin, J.P. Shanks, C.R. Strohman, S. Wang
    CLASSE, Ithaca, New York, USA
  • R. Holtzapple
    CalPoly, San Luis Obispo, California, USA
 
  Funding: NSF Award (PHY-0734867) NSF Award (PHY-1002467) Japan/US Cooperation Program Education and lifelong learning, co-financed by Greece and the European Union
Intrabeam scattering dilutes the emittance of low energy, low emittance rings. Because CesrTA can be operated at low energies with low transverse emittances and high bunch intensity, it is an ideal laboratory for the study of IBS effects. Furthermore, CesrTA is instrumented for accurate beam size measurements in all three dimensions, providing the possibility of a complete determination of the intensity dependence of emittances. Models based on classical IBS theories and multi-particle simulations are used to estimate the effect of IBS at CesrTA at different beam emittances, intensities and energies. The first measurements from machine studies at CesrTA are presented.
 
 
THPPR015 CESR Control System Upgrade to Linux High Availability Cluster 3999
 
  • M.J. Forster, S.E. Ball, L.Y. Bartnik, D.A. Bougie, R.G. Helmke, M.A. Palmer, S.B. Peck, D.S. Riley, R.J. Sholtys, C.R. Strohman
    CLASSE, Ithaca, New York, USA
 
  Funding: Supported by U.S. National Science Foundation, Award PHY-0734867 and Award PHY-1002467, as well as, U.S. Department of Energy, Award DE-FC02-08ER41538.
The Cornell Electron Storage Ring (CESR) accelerator complex is used to support the Cornell High Energy Synchrotron Source (CHESS) x-ray user facility and the CESR Test Accelerator (CESRTA) ILC development program. Several hundred electro-magnetic elements as well as several thousand sensors are controlled and monitored in real-time via a Multi-Port Memory device (MPM). MPM access and control programs have used Hewlett Packard (originally DEC) Alpha and VAX computers running OpenVMS since 1988. Due to the demanding throughput, computational and storage requirements of the CESRTA experimental program, as well as a desire to upgrade to more supportable hardware, we have implemented a new Linux control cluster based on an Infortrend 10 GbE Internet Small Computer System Interface (iSCSI) storage device and the Red Hat Cluster Suite. This paper will describe the hardware and software changes required to upgrade our VMS cluster to a high availability, high performance, Linux control cluster.