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Strohman, C.R.

Paper Title Page
MOPE089 CESR Beam Position Monitor System Upgrade for CesrTA and CHESS Operations 1191
 
  • M.A. Palmer, M.G. Billing, R.E. Meller, M.C. Rendina, N.T. Rider, D. L. Rubin, J.P. Shanks, C.R. Strohman
    CLASSE, Ithaca, New York
  • R. Holtzapple
    CalPoly, San Luis Obispo, CA
 
 

The beam position monitor (BPM) system at the Cornell Electron Storage Ring (CESR) has been upgraded for use in both CESR Test Accelerator (CesrTA) and Cornell High Energy Synchrotron Source (CHESS) operations. CesrTA operates with electron and positron bunch trains with as little as 4ns bunch spacing. CHESS operates with simultaneous counter-rotating electron and positron trains with 14ns bunch spacing. The upgraded BPM system provides high resolution measurement capability as is needed for the CesrTA ultra low emittance operations, turn-by-turn digitization of multiple bunches for beam dynamics studies, and the capability for real-time dual beam monitoring in CHESS conditions. In addition to standard position measurement capability, the system is also required to measure betatron phase by synchronous detection of a driven beam for optics diagnosis and correction. This paper describes the characteristics of the BPM hardware upgrade, performance figures of the electronics designed for this purpose and the overall status of the upgrade effort. Examples of key measurement types and the analysis of data acquired from the new instruments will also be presented.

 
MOPE091 Techniques for Observation of Beam Dynamics in the Presence of an Electron Cloud 1197
 
  • M.G. Billing, G. Dugan, R.E. Meller, M.A. Palmer, M.C. Rendina, N.T. Rider, J.P. Sikora, C.R. Strohman
    CLASSE, Ithaca, New York
  • R. Holtzapple
    CalPoly, San Luis Obispo, CA
 
 

During the last several years CESR has been studying the effects of electron clouds on stored beams in order to understand their impact on future linear-collider damping ring designs. One of the important issues is the way that the electron cloud alters the dynamics of bunches within the train. Techniques for observing the dynamical effects of beams interacting with the electron clouds have been developed. These methods will be discussed and examples of measurements will be presented.

 
TUYMH02 Electron Cloud at Low Emittance in CesrTA 1251
 
  • M.A. Palmer, J.P. Alexander, M.G. Billing, J.R. Calvey, C.J. Conolly, J.A. Crittenden, J. Dobbins, G. Dugan, N. Eggert, E. Fontes, M.J. Forster, R.E. Gallagher, S.W. Gray, S. Greenwald, D.L. Hartill, W.H. Hopkins, D.L. Kreinick, B. Kreis, Z. Leong, Y. Li, X. Liu, J.A. Livezey, A. Lyndaker, J. Makita, M.P. McDonald, V. Medjidzade, R.E. Meller, T.I. O'Connell, S.B. Peck, D.P. Peterson, G. Ramirez, M.C. Rendina, P. Revesz, D.H. Rice, N.T. Rider, D. L. Rubin, D. Sagan, J.J. Savino, R.M. Schwartz, R.D. Seeley, J.W. Sexton, J.P. Shanks, J.P. Sikora, E.N. Smith, C.R. Strohman, H.A. Williams
    CLASSE, Ithaca, New York
  • F. Antoniou, S. Calatroni, M. Gasior, O.R. Jones, Y. Papaphilippou, J. Pfingstner, G. Rumolo, H. Schmickler, M. Taborelli
    CERN, Geneva
  • D. Asner
    Carleton University, College of Natural Sciences, Ottawa, Ontario
  • L. Boon, A.F. Garfinkel
    Purdue University, West Lafayette, Indiana
  • J.M. Byrd, C.M. Celata, J.N. Corlett, S. De Santis, M.A. Furman, A. Jackson, R. Kraft, D.V. Munson, G. Penn, D.W. Plate, M. Venturini
    LBNL, Berkeley, California
  • B.T. Carlson
    Grove City College, Grove City, Pennsylvania
  • T. Demma
    INFN/LNF, Frascati (Roma)
  • R.T. Dowd
    ASCo, Clayton, Victoria
  • J.W. Flanagan, P. Jain, K. Kanazawa, K. Kubo, K. Ohmi, H. Sakai, K. Shibata, Y. Suetsugu, M. Tobiyama
    KEK, Ibaraki
  • D. Gonnella
    Clarkson University, Potsdam, New York
  • W. Guo
    BNL, Upton, Long Island, New York
  • K.C. Harkay
    ANL, Argonne
  • R. Holtzapple
    CalPoly, San Luis Obispo, CA
  • J.K. Jones, A. Wolski
    Cockcroft Institute, Warrington, Cheshire
  • D. Kharakh, J.S.T. Ng, M.T.F. Pivi, L. Wang
    SLAC, Menlo Park, California
  • M.C. Ross, C.-Y. Tan, R.M. Zwaska
    Fermilab, Batavia
  • L. Schächter
    Technion, Haifa
  • E.L. Wilkinson
    Loyola University, Chicago, Illinois
 
 

The Cornell Electron Storage Ring (CESR) has been reconfigured as a test accelerator (CesrTA) for a program of electron cloud (EC) research at ultra low emittance. The instrumentation in the ring has been upgraded with local diagnostics for measurement of cloud density and with improved beam diagnostics for the characterization of both the low emittance performance and the beam dynamics of high intensity bunch trains interacting with the cloud. Finally a range of EC mitigation methods have been deployed and tested. Measurements of cloud density and its impact on the beam under a range of conditions will be presented and compared with simulations. The effectiveness of a range of mitigation techniques will also be discussed.

 

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Slides

 
TUPD023 CesrTA Retarding Field Analyzer Measurements in Drifts, Dipoles, Quadrupoles and Wigglers 1973
 
  • J.R. Calvey, Y. Li, J.A. Livezey, J. Makita, R.E. Meller, M.A. Palmer, R.M. Schwartz, C.R. Strohman
    CLASSE, Ithaca, New York
  • S. Calatroni, G. Rumolo
    CERN, Geneva
  • K.C. Harkay
    ANL, Argonne
  • K. Kanazawa, Y. Suetsugu
    KEK, Ibaraki
  • M.T.F. Pivi, L. Wang
    SLAC, Menlo Park, California
 
 

Over the course of the CesrTA program, the Cornell Electron Storage Ring (CESR) has been instrumented with several retarding field analyzers (RFAs), which measure the local density and energy distribution of the electron cloud. These RFAs have been installed in drifts, dipoles, quadrupoles, and wigglers; and data have been taken in a variety of beam conditions and bunch configurations. This paper will provide an overview of these results, and give a preliminary evaluation of the efficacy of cloud mitigation techniques implemented in the instrumented vacuum chambers.