| Paper |
Title |
Page |
| MOCP02 |
High-power accelerators in China: status and outlook
|
39 |
| |
- J. Wei
BNL, Upton, Long Island, New York
- S. X. Fang, S. Fu
IHEP Beijing, Beijing
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| |
High intensity accelerator research is a relatively new subject in China. Recent program includes the accelerator-driven sub-critical power generation and the Beijing Spallation Neutron Source (BSNS) project. The Beijing Spallation Neutron Source (BSNS) is a newly approved project based on a H- linear accelerator and a rapid cycling synchrotron. During the past year, several major revisions were made on the design including the type of the front end, the linac frequency, the transport layout, the ring lattice, and the type of ring components. Possible upgrade paths were also laid out: based on an extension of the warm linac, the ring injection energy and the beam current could be raised doubling the beam power on target to reach 200 kW; an extension with a superconducting RF linac of similar length could raise the beam power near 0.5 MW. Based on these considerations, research and development activities are started. In this paper, we discuss the rationale of design revisions and summarize the recent works.
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| TUAX06 |
Electron cloud and single-bunch instabilities in the Relativistic Heavy Ion Collider
|
117 |
| |
- 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
|
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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| FRAP05 |
Summary of Working Group D
|
372 |
| |
- A. V. Fedotov, J. Wei
BNL, Upton, Long Island, New York
- I. N. Meshkov
JINR, Dubna, Moscow Region
|
|
| FRAP08 |
Summary of General Working Group A+B+D with a Focus on Code Benchmarking
|
379 |
| |
- J. Wei
BNL, Upton, Long Island, New York
- I. Hofmann
GSI, Darmstadt
- E. N. Shaposhnikova, F. Zimmermann
CERN, Geneva
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