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ion-effects

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MOPLS133 Preliminary Studies of Ion Effects in ILC Damping Rings ion, damping, electron, TESLA 867
 
  • G.X. Xia, Eckhard. Elsen
    DESY, Hamburg
  Ion effects are potentially detrimental to the performance of the damping rings for the International Linear Collider (ILC). In this paper, the ion effects in the damping rings of ILC are briefly reviewed. Fast beam-ion instability (FBII) is studied in the linear regime. The growth rates and the beam blowups due to FBII are analytically calculated and compared for two variants of the ILC damping ring designs (OCS and TESLA) and discussed as a function of the vacuum pressure. Finally, some detailed simulation results are also presented.  
 
WEPCH103 Ion Effects in the Electron Damping Ring of the International Linear Collider ion, damping, electron, emittance 2155
 
  • L. Wang, T.O. Raubenheimer
    SLAC, Menlo Park, California
  • A. Wolski
    Liverpool University, Science Faculty, Liverpool
  Ion-induced beam instabilities and tune shifts are critical issues for the electron damping ring of the International Linear Collider (ILC). To avoid conventional ion trapping (multi-turn trapping), a long gap is introduced in the electron beam by omitting a number of successive bunches out of a long train. However, the beam can still suffer from the fast ion instability (FII), driven by ions that last only for a single passage of the electron bunches. Our study shows that the ion effects can be significantly mitigated by using multiple gaps, so that the stored beam consists of a number of relatively short bunch trains. The ion effects in the ILC damping rings are investigated using both analytical and numerical methods.