Author: Iriso, U.
Paper Title Page
MOYCA01 Review of Linear Optics Measurements and Corrections in Accelerators 20
 
  • R. Tomás
    CERN, Geneva, Switzerland
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • A. Franchi
    ESRF, Grenoble, France
  • U. Iriso
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
 
  The measurement and correction of optics parameters has been a major concern since the advent of strong focusing synchrotron accelerators. Traditionally, colliders have led the development of methods for optics control based on turn-by-turn centroid data, while lepton storage rings have focused on closed orbit response techniques. Recently considerable efforts are being invested in comparing these techniques in different light sources and colliders. An emerging class of less invasive optics control techniques based on the optimization of performance related observables is demonstrating a great potential. A review of the existing techniques is presented highlighting comparisons, merits and limitations.  
slides icon Slides MOYCA01 [4.184 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOYCA01  
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MOPOR007 Local Impedance Measurements at ALBA from Turn-by-Turn Acquisition 598
 
  • M. Carlà, G. Benedetti, T.F.G. Günzel, U. Iriso, Z. Martí
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
 
  A transverse impedance source manifests itself, among other ways, by producing a small defocusing kick which depends on the beam bunch charge. By repeating optics measurements for different bunch charges, it is possible to disentangle the contribution produced by each impedance source from the dominating focusing effects given by the machine optics. But hunting for such faint defocusing effects poses strong requirements on the precision and sensibility of the measurements, and slow machine drifts or different thermal conditions shall be avoided. In this report, we present a novel method to assess in a fast and precise manner machine optics for different bunch charges using BPM turn-by-turn data and hybrid filling patterns. Finally, measurements for different ALBA machine components like scrapers and In-vacuum undulators are compared with simulation results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR007  
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WEPOW033 Commissioning of the Alba Injector With 67 Mev Single Klystron Linac 2905
 
  • G. Benedetti, U. Iriso, J. Marcos, Z. Martí, V. Massana, R. Muñoz Horta, F. Pérez, M. Pont
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
 
  The 3 GeV ALBA booster normally accelerates an injected beam of 110 MeV, delivered by the linac operating with two independent klystrons. On 2014, the linac waveguide system was upgraded and commissioned to allow operating with either klystron and providing a reduced beam energy of 67 MeV. The commissioning of the booster to capture the beam at a reduced energy and ramp it up to 3 GeV has required a long set-up process of the magnets at 67 MeV beam energy. Due to the dominant effect of the remnant magnetic field in the low energy regime, the scaling of the magnet settings at the beginning of the ramp did not allow to capture the beam, and more precise calibrations were measured on spare quadrupoles to ease its fine tuning. The effect of higher eddy currents induced when the dipoles start ramping, combined with the lower beam rigidity, has been also an issue to tune the dipole waveforms for the 67 MeV - 3 GeV cycle. The encountered problems and their solutions to commission the ALBA injector in this new mode of operation are here presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW033  
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