Modeling of fast Beam-Ion Instabilities

L. Mether, A. Oeftiger & G. Rumolo
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...
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