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Investigation into electron cloud effects in the International Linear Collider positron damping ring

J. A. Crittenden*, J. Conway, G. F. Dugan, M. A. Palmer†, D. L. Rubin, J. Shanks, and K. G. Sonnad

L. Boon and K. Harkay

T. Ishibashi

M. A. Furman

S. Guiducci

M. T. F. Pivi‡ and L. Wang

  • CLASSE, Cornell University, Ithaca, New York 14853, USA

  • ANL, Argonne, Illinois 60439, USA

  • KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

  • LBNL, Berkeley, California 94720, USA

  • INFN Laboratori Nazionali di Frascati, P.O. Box 13, I-00044, Frascati (Rome), Italy

  • SLAC, Menlo Park, California 94025, USA
  • *crittenden@cornell.edu
  • †Present address: Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510-5011, USA.
  • ‡Present address: IMS Nanofabrication, Vienna, Austria.
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Phys. Rev. ST Accel. Beams 17, 031002 – Published 17 March, 2014

DOI: https://doi.org/10.1103/PhysRevSTAB.17.031002

Abstract

We report modeling results for electron cloud buildup and instability in the International Linear Collider positron damping ring. Updated optics, wiggler magnets, and vacuum chamber designs have recently been developed for the 5 GeV, 3.2-km racetrack layout. An analysis of the synchrotron radiation profile around the ring has been performed, including the effects of diffuse and specular photon scattering on the interior surfaces of the vacuum chamber. The results provide input to the cloud buildup simulations for the various magnetic field regions of the ring. The modeled cloud densities thus obtained are used in the instability threshold calculations. We conclude that the mitigation techniques employed in this model will suffice to allow operation of the damping ring at the design operational specifications.

Article Text

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Outline

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Phys. Rev. ST Accel. Beams 17, 031002– Published 17 March, 2014
  • Received 13 November 2013
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