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Weis, T.

Paper Title Page
WEPEB031 Fast Orbit Feedback for DELTA and FAIR 2752
 
  • P. Hartmann, S. Khan, D. Schirmer, G. Schünemann, P. Towalski, T. Weis
    DELTA, Dortmund
  
 

A stable beam orbit is essential for safe operation of particle accelerators. This applies to electron machines and even more to hadron machines running high beam currents. Based on developments at DELTA, basic designs of fast orbit feedbacks systems for the FAIR rings SIS18 and HESR (planned) and COSY at the Forschungszentrum Jülich are presented.

  
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.