Modeling of fast Beam-Ion Instabilities

Authors

  • L. Mether EPFL, Lausanne
  • A. Oeftiger CERN, Geneva
  • G. Rumolo CERN, Geneva

DOI:

https://doi.org/10.23732/CYRCP-2018-001.63

Keywords:

Beam instabilities, fast beam-ion instability, ion trapping

Abstract

Beam-induced ionisation of residual gas in the vacuum chamber generates ions, which in an electron machine can accumulate around a passing bunch train. If the density of trapped ions becomes sufficiently high, a fast beam-ion in- stability will be excited. The development of the instability can be prevented by keeping the pressure of the residual gas below a certain value. This contribution describes the mod- eling of fast beam-ion instabilities and presents simulation studies of ion trapping and the evolution of the instability in the FCC-ee. Threshold ion densities for exciting the insta- bility are estimated in order to deduce acceptable vacuum pressures for operation.

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Published

2018-11-07

Issue

Vol. 1 (2018): Proceedings of the ICFA Mini-Workshop "Impedances and Beam Instabilities in Particle Accelerators"

Section

Submission to the proc. of the ICFA Mini-Workshop Workshop "Impedances and Beam Instabilities in Particle Accelerators"

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