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Mehler, M.

Paper Title Page
FRPMN069 Longitudinal Coupled-Bunch Instabilities in the CERN PS 4180
  • H. Damerau, S. Hancock, C. Rossi, E. N. Shaposhnikova, J. Tuckmantel, J.-L. Vallet
    CERN, Geneva
  • M. Mehler
    GSI, Darmstadt
  Funding: Work supported by EU Design Study DIRACsecondary-Beams (contract 515873).

Longitudinal coupled bunch instabilities in the CERN PS represent a major limitation to the high brightness beam delivered for the LHC. To identify possible impedance sources for these instabilities, machine development studies have been carried out. The growth rates of coupled bunch modes have been measured, and modes have been identified using mountain range data. Growth rate estimations from coupled bunch mode theory are compared to these results. It is shown that the longitudinal impedance of the broad resonance curve of the main 10 MHz RF system can be identified as the most probable source. Possible methods to improve the beam stability are analyzed together with the performance of a damping system.