TUO1A  —  Tuesday, first oral session   (22-May-07   09:00—10:20)

Chair: U. Raich, CERN, Geneva

Paper Title Page
TUO1A01 Bunched Beam Stochastic Cooling for RHIC 39
 
  • J. M. Brennan, M. Blaskiewicz, F. Severino
    BNL, Upton, Long Island, New York
 
  Stochastic cooling is an effective and well-established accelerator technology for improving beam quality. However, stochastic cooling of high frequency bunched beam has always proved problematic. We have built a stochastic cooling system for heavy ions in RHIC that is used on bunched beam. The purpose is to counteract Intra-Beam Scattering and improve integrated luminosity. The chief technical challenge of bunched beam is the strong coherent frequency components in the beam that contaminate the Schottky spectrum. Technical solutions for overcoming this problem are described. Results from commissioning in one ring of RHIC are reported.  
TUO1A02 Feedbacks on Tune and Chromaticity 43
 
  • R. J. Steinhagen
    CERN, Geneva
 
  Feedbacks on tune, coupling and chromaticity are becoming an integral part of safe and reliable accelerator operation. Tight tolerances on beam parameters typically constrain the allowed oscillation amplitudes to the micrometre range, leaving only a small margin for the transverse beam and momentum excitations required for tune and chromaticity measurements. This contribution presents an overview of these beam-based feedback systems, their architecture and design choices involved. It discusses performance limitations due to cross-constraints, non-linearities, the coupling between multiple nested loops, and the interdependence of beam parameters.  
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TUO1A03 Beam Diagnostic Features of the ESRF Multibunch Feedback 48
 
  • J. M. Koch, F. Epaud, G. A. Naylor, E. Plouviez
    ESRF, Grenoble
 
  The ESRF storage ring is now equiped with a set of multibunch feedback systems. The main goal of the implementation of these systems is to prevent longitudinal and transverse instabilities. However, beside this main function, these systems provide a powerful diagnostic to study the longitudinal and transverse beam dynamic and document operation problems. In this paper we give a short overview of these feedback systems and describe their diagnostics function in more detail.