Simulation of the Electron Cloud for Various Configurations of a Damping Ring for the ILC

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In the beam pipe of the positron damping ring of the International Linear Collider (ILC), an electron cloud may be first produced by photoelectrons and ionization of residual gases and then increased by the secondary emission process. This paper reports the assessment of electron cloud effects in a number of configuration options for the ILC baseline configuration. Careful estimates were made of the secondary electron yield threshold for electron cloud build-up, and the related single- and coupled-bunch instabilities, as a function of beam current and surface properties for a variety of optics designs. When the configuration for the ILC damping ... continued below

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4 pages

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Pivi, M.; Wang, L.; /SLAC; Ohmi, K.; /KEK, Tsukuba; Wanzenberg, R. et al. June 23, 2006.

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In the beam pipe of the positron damping ring of the International Linear Collider (ILC), an electron cloud may be first produced by photoelectrons and ionization of residual gases and then increased by the secondary emission process. This paper reports the assessment of electron cloud effects in a number of configuration options for the ILC baseline configuration. Careful estimates were made of the secondary electron yield threshold for electron cloud build-up, and the related single- and coupled-bunch instabilities, as a function of beam current and surface properties for a variety of optics designs. When the configuration for the ILC damping rings was chosen at the end of 2005, the results from these studies were important considerations. On the basis of the theoretical and experimental work, the baseline configuration currently specifies a pair of 6 km damping rings for the positron beam, to mitigate the effects of the electron cloud that could present difficulties in a single 6 km ring.

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4 pages

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  • Presented at European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006

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  • Report No.: SLAC-PUB-11922
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 884877
  • Archival Resource Key: ark:/67531/metadc873441

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  • June 23, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 9:16 p.m.

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Pivi, M.; Wang, L.; /SLAC; Ohmi, K.; /KEK, Tsukuba; Wanzenberg, R. et al. Simulation of the Electron Cloud for Various Configurations of a Damping Ring for the ILC, article, June 23, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc873441/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.