Observation and Damping of Longitudinal Coupled-bunch Oscillations in the CERN PS

H. Damerau, A. Lasheen & M. Migliorati
Longitudinal coupled-bunch instabilities pose a major limitation to the intensity and quality of LHC-type beams in the CERN Proton Synchrotron (PS). The oscillations are excited above transition energy and mainly driven by the impedance of the main accelerating cavities at around 10 MHz. When approaching the flat-top these cavities are partly short-circuited. However, due to the sweeping revolution frequency, the spectral components of the beam move towards the resonances of the high frequency cavities at...
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