Electron Cloud in the Wigglers of the Positron Damping Ring of the International Linear Collider

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The ILC positron damping ring comprises hundreds of meters of wiggler sections, where many more photons than in the arcs are emitted, and with the smallest beampipe aperture of the ring. A significant electron-cloud density can therefore be accumulated via photo-emission and via beam-induced multipacting. In field-free regions the electron-cloud build up may be suppressed by adding weak solenoid fields, but the electron cloud remaining in the wigglers as well as in the arc dipole magnets can still drive single-bunch and multi-bunch beam instabilities. This paper studies the electron-cloud formation in an ILC wiggler section for various scenarios, as well ... continued below

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3 pages

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Wang, L. & /SLAC July 6, 2007.

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The ILC positron damping ring comprises hundreds of meters of wiggler sections, where many more photons than in the arcs are emitted, and with the smallest beampipe aperture of the ring. A significant electron-cloud density can therefore be accumulated via photo-emission and via beam-induced multipacting. In field-free regions the electron-cloud build up may be suppressed by adding weak solenoid fields, but the electron cloud remaining in the wigglers as well as in the arc dipole magnets can still drive single-bunch and multi-bunch beam instabilities. This paper studies the electron-cloud formation in an ILC wiggler section for various scenarios, as well as its character, and possible mitigation schemes.

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3 pages

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  • Presented at Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007

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  • Report No.: SLAC-PUB-12642
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 909536
  • Archival Resource Key: ark:/67531/metadc888007

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  • July 6, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 5, 2016, 2:48 p.m.

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Wang, L. & /SLAC. Electron Cloud in the Wigglers of the Positron Damping Ring of the International Linear Collider, article, July 6, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc888007/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.