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Fuersch, J.     [Fürsch, J.]

Paper Title Page
WEPEB032 Studies and Control of Coupled-bunch Instabilities at DELTA 2755
 
  • S. Khan, J. Fürsch, P. Hartmann, T. Weis
    DELTA, Dortmund
  • D. Teytelman
    Dimtel, San Jose
 
 

DELTA is a 1.5-GeV synchrotron radiation source at the TU Dortmund University with 2 ns bunch spacing. At nominal operating currents, the beam exhibits significant longitudinal centroid motion due to coupled-bunch instabilities. Two techniques were successfully used at DELTA to damp such instabilities: RF phase modulation, which also improves the beam lifetime, and bunch-by-bunch feedback. Using diagnostic data from the bunch-by-bunch feedback system, modal spectra and growth rates of the longitudinal instabilities were characterized. We also present a preliminary characterization of transverse coupled-bunch oscillations observed at the highest beam currents.