| Paper |
Title |
Page |
| TUPLT137 |
Comparative Simulation Studies of Electron Cloud Build-up for ISIS and Future Upgrades
|
1446 |
| |
- G. Bellodi
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
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Electron cloud effects currently limit the performance of several proton accelerators operating with high beam current. Although ISIS, the 160 kW 70-800 MeV proton synchrotron at the Rutherford Appleton Laboratory (UK), has never appeared to be affected by the problem in its 15 years of operations, e-p instabilities could potentially be a cause of concern for future machine upgrades to higher beam powers. In this paper we review the present status of simulations for ISIS and compare it to preliminary results for two upgrade options: a 0.5MW 180-800 MeV scheme and a 1MW 0.8-3 GeV scheme with an additional synchrotron using ISIS as a booster (see C. Prior et al., ISIS megawatt upgrade plans, in Proceedings of the 2003 Particle Accelerator Conference PAC 2003, Portland, Or, USA).
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| WEPLT054 |
Electron Cloud Build up in Coasting Beams
|
1960 |
| |
- G. Rumolo
GSI, Darmstadt
- G. Bellodi
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
- K. Ohmi
KEK, Ibaraki
- F. Zimmermann
CERN, Geneva
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| |
Electrons could in principle accumulate in the potential of coasting beams of positively charged particles until a balance between the beam force and space charge force from the electrons is reached. But the continuous interaction between a non-ideal perturbed coasting beam and the cloud of electrons being trapped by it, together with the reflection and secondary emission processes at the inner pipe wall, can alter this picture and cause a combined cloud or beam transverse instability long before the concentration of electrons reaches the theoretical equilibrium value. The issue is addressed in this paper by means of combined build-up and instability simulations carried out with the HEADTAIL code.
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| THPLT017 |
Review and Comparison of Simulation Codes Modeling Electron-Cloud Build Up and Instabilities
|
2499 |
| |
- F. Zimmermann, E. Benedetto, F. Ruggiero, D. Schulte
CERN, Geneva
- G. Bellodi
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
- M. Blaskiewicz, L. Wang
BNL, Upton, Long Island, New York
- Y. Cai, M.T.F. Pivi
SLAC, Menlo Park, California
- V.K. Decyk, W. Mori
UCLA, Los Angeles, California
- M.A. Furman
LBNL/AFR, Berkeley, California
- A.F. Ghalam, T. Katsouleas
USC, Los Angeles, California
- K. Ohmi, S.S. Win
KEK, Ibaraki
- G. Rumolo
GSI, Darmstadt
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Several computer codes written at various laboratories are employed for modelling the generation and the consequences of an electron cloud. We review the most popular of these programs, which simulate either the build of an electron cloud or the instabilities it produces, and we compare simulation results for identical, or similar, input parameters obtained from the various codes.
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