Author: Benedetti, G.
Paper Title Page
TUPWO041 Beam Size and Emittance Measurements during the ALBA Booster Ramp 1964
  • U. Iriso, G. Benedetti
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  The beam emittance in the ALBA Booster is damped from 50·10-6 m*rad to 10-9 m*rad during the energy acceleration from 110 MeV to 3 GeV. The synchrotron radiation monitor installed in a dipole magnet provides the transverse beam size evolution along the energy ramp, which is then used to calculate the emittance evolution during the full booster cycle (from injection to extraction). In this report, we present the experimental set-up and technique of this measurement, and discuss the agreement between the measured parameters and theoretical values.  
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.  
WEPWA049 Top-up Safety Simulations for the ALBA Storage Ring 2229
  • G. Benedetti
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  The potential hazards introduced by injecting into the ALBA storage ring with front end shutters open are determined through particle tracking simulations. The method is based on the possible overlap between phase space of forwards and backwards tracking between the straight section downstream the front end and the beamline. Realistic magnetic field, trajectory, aperture and energy errors are taken into account. Scenarios that could bring an injected beam of electrons passing through an open beamline front end are identified. The interlocks required to prevent such situations from arising are stated.