| Paper |
Title |
Page |
| TUAX06 |
Electron cloud and single-bunch instabilities in the Relativistic Heavy Ion Collider
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117 |
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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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| WEBY03 |
Experimental studies of IBS in RHIC and comparison with theory
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259 |
| |
- A. V. Fedotov, W. Fischer, S. Tepikian, J. Wei
BNL, Upton, Long Island, New York
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A high-energy electron cooling system is presently being developed to overcome emittance growth due to Intra-beam Scattering (IBS) for heavy ion operation in RHIC. A critical item for choosing appropriate parameters of the cooler is an accurate description of the IBS. The analytic models were verified vs dedicated IBS measurements. Analysis of the 2004 data with the Au ions showed very good agreement for the longitudinal growth rates but significant disagreement with exact IBS models for the transverse growth rates. Experimental measurements were improved for the 2005 run with the Cu ions. Here, we present comparison of the 2005 data with theoretical models.
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