Author: Marcos, J.
Paper Title Page
TUPWO042 Modeling Results from Magnetic and Beam Based Measurements of the ALBA Gradient Dipoles 1967
  • X. Gavaldà
    SOLEIL, Gif-sur-Yvette, France
  • G. Benedetti, J. Marcos, Z. Martí
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  The ALBA lattice is a DBA-like structure where most of vertical focusing is provided by gradient dipoles. In the first year of machine operation, the model parameters describing the focusing strength of the 32 dipoles have been calibrated by fitting the measured closed orbit response matrix. The mean k-value obtained from this analysis differs by -0.3% with respect to the value taken from the magnetic measurements previous to the magnet installation, while the k variation within the 32 dipoles is of the same order of magnitude. The optics results (tunes, beta beating, dispersion) obtained with the beam based model are compared with the predicted ones from the magnetic measurement model.  
WEPME038 Slow Orbit Feedback and Beam Stability at ALBA 3010
  • J. Marcos, M. Muñoz
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  ALBA is a 3GeV 3rd generation synchrotron radiation source built nearby Barcelona providing service to users since May 2012. During all this period, a Slow Orbit Feedback system (SOFB) has been running during users’ operation in order to deliver a stable photon beam to the Beamlines. The system employs 88 out of the 104 Beam Position Monitors (BPMs) available at ALBA and 88 horizontal and vertical correctors. In addition, since the middle of the year (July 2012), the reading of the X-Ray BPM (XBPM) for one of the Front Ends, with a Bending Magnet as a source, has also been included in the correction loop. In this paper we summarize the performance of the SOFB system. Besides, we also present data corresponding to the evolution along the year of the XBPM readings for several Front Ends that have a planar Insertion Device (ID) as a source. The analyzed XBPMs are not included in the orbit correction loop, and consequently they supply information regarding the long term stability of ALBA Storage Ring.