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- J. Wei, M. Bai, M. Blaskiewicz, P. Cameron, R. Connolly, A. Della Penna, W. Fischer, H.-C. Hseuh, H. Huang, R. C. Lee, R. J. Michnoff, V. Ptitsyn, T. Roser, T. Satogata, S. Tepikian, S. Y. Zhang
BNL, Upton, Long Island, New York
- U. Iriso
CELLS, Bellaterra (Cerdanyola del Vallès)
- L. Wang
SLAC, Menlo Park, California
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Electron cloud is one of the leading mechanisms that limit the performance of high intensity circular accelerators and colliders. Electron cloud in RHIC is in an intermediate regime sharing features of both the long-bunch (PSR) and short-bunch (photon factories) machines. Vacuum-pressure rises, transverse tune shifts, and electron flux are observed at injection, upon transition crossing, and at top energy. Transverse emittance growth, fast instabilities, and beam loss also occur upon transition crossing. Mitigation measures are implemented both to reduce the production of electron cloud and to control the beam stability. This paper summarizes the observation and initial analysis of the electron-cloud effects at RHIC.
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