• A. Streun, M. Böge, N. Milas, F. Müller, V. Schlott, H. Sigg
  PSI, Villigen
• G.A. Amatuni, D. Gishyan, K. Manukyan, A. Sargsyan
  CANDLE, Yerevan

Recently tentative top-up operation of the Swiss Light Source (SLS) storage ring at low momentum compaction factor has been started. We will present an analysis of the longitudinal dynamics and simulations of the injection process, and explain our method to ensure closed orbit stability. First experimental results will be shown and compared to the model predictions.

• G.X. Xia
  MPI-P, München
• M. Ivanyan
  CANDLE, Yerevan
• K. Manukyan, K.A. Sargsyan
  YSU, Yerevan
• R. Wanzenberg
  DESY, Hamburg

At DESY the PETRA accelerator has been converted into a new 3rd generation high-brilliance synchrotron radiation facility called PETRA III. For the first commissioning in spring 2009 a positron beam is used. In the future it is also foreseen to operate the synchrotron light source with an electron beam. Ion effects pose a potential problem to the electron beam operation of PETRA III. In this paper, a weak-strong simulation code is employed to study the ion effect issues in detail for different operation scenarios.

• K. Manukyan
  YSU, Yerevan
• G.A. Amatuni, A. Sargsyan, V.M. Tsakanov
  CANDLE, Yerevan
• M. Böge, A. Streun
  PSI, Villigen

An online measurement of the beam energy spread is based on the analysis of the decoherence/recoherence signals obtained from the beam position monitors after a single turn beam excitation by a pinger magnet. Furthermore the analysis allows calibration of the model in terms of higher order chromaticities and amplitude dependant tune shifts. An analytical model including 1st and 2nd order chromaticities and amplitude dependant tune shift will be presented.