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| FTR00 |
ILC Damping Rings: Benefit of the Antechamber or: Antechamber vs. SEY
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194 |
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We review the simulation results for the electron cloud build-up for the ILC Damping Rings, for both lattice options considered (6 km and 3 km), in a field-free region and in a bending dipole magnet. While the 6 km lattice is slightly more forgiving than the 3-km lattice vis-a-vis the electron cloud effects, we conclude that, in general, the existence of an antechamber helps to dramatically reduce the electron-cloud density (factor ~50) only if the peak secondary yield of the chamber surface is below a certain critical value. This critical value is in the range ~1.1~1.3, depending on various details.
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Slides
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| FTR01 |
CesrTA Preliminary Recommendations for the ILC Positron Damping Ring
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202 |
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- M. Palmer
Cornell University - CLASSE
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The first phase of the CesrTA experimental program is now complete. Electron cloud research over the course of the last 2.5 years has focused on two principle topics. The first is the characterization of methods to mitigate the electron cloud build-up in each of the magnetic field regions of concern for damping ring design. The second is the characterization of the cloud's impact on ultra-low emittance beams. Our intent is now to incorporate these results into the technical design of the positron damping ring for the International Linear Collider. Implications for the ILC DR design will be discussed. While no paper is available here, two references were published covering our recommendations: M. T.F. Pivi, L. Wang, L. E. Boon, K. C. Harkay, J. A. Crittenden, G. Dugan, M. A. Palmer, T. Demma, S. Guiducci, M. A. Furman, K. Ohmi, K. Shibata, Y. Suetsugu, J. Urakawa, C. Yin Vallgren, "Recommendation for Mitigations of the Electron Cloud Instability in the ILC", (TUPC030) Proceedings of IPAC 2011, San Sebastián, Spain. J. A. Crittenden, J. V. Conway, G. Dugan, M. A. Palmer, D. L. Rubin, L. E. Boon, K. C. Harkay, M. A. Furman, S. Guiducci, M. T.F. Pivi, L. Wang, "Investigation into Electron Cloud Effects in the ILC Damping Ring Design", (TUPPR063) Proceedings of IPAC 2012, New Orleans, Louisianna, USA.
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Slides
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| FTR02 |
Simulation of Electron Cloud Induced Instabilities and Emittance Growth for CesrTA
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203 |
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- M. Pivi
SLAC National Accelerator Laboratory
- G. Dugan, M. Palmer, K. Sonnad
Cornell University - CLASSE
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As part of the international Linear Collider (ILC) collaboration, we have compared the electron cloud (EC) effect for different Damping Ring (DR) designs respectively with 6.4 km and 3.2 km circumference and investigated the feasibility of the shorter damping ring with respect to the electron cloud build-up and related beam instabilities. The studies for a 3.2 km ring were carried out with beam parameters of the ILC Low Power option. A reduced damping ring circumference has been proposed for the new ILC baseline design and would allow considerable reduction of the number of components, wiggler magnets and costs. We also present the results for the luminosity upgrade option with shorter 3ns bunch spacing. In particular we will go through the evaluation of mitigation techniques for the ILC DR and discuss the integration of the CesrTA results into the Damping Ring design. Furthermore (with Kiran Sonnad, Cornell) we have performed detailed simulations using the CMAD code for CesrTA single-bunch instability and linear emittance growth below threshold and preliminary comparisons with experimental data are discussed here in view of the validation of the simulation codes prediction for the ILC DR.
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Slides
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| FTR03 |
Mitigation Strategy of Electron Cloud Effects in the Super KEKB Positron Ring
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The upgrade of KEKB to Super KEKB has just started. Now the design work of the positron ring is underway. The present mitigation plan of the electron cloud effect will be reported.
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Slides
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