Author: Olmos, A.
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TUPF03 Overview of the Geometrical Non-Linear Effects of Button BPMs and Methodology for Their Efficient Suppression 298
 
  • A.A. Nosych, U. Iriso, A. Olmos
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • M. Wendt
    CERN, Geneva, Switzerland
 
  This paper describes an overview of the geometric non-linear effects common to beam position monitors (BPMs) installed in the accelerators and a methodology to correct for these effects. A typical characteristic curve of a pick-up is linear within a limited range from the BPM origin. At larger offsets the non-linearity of the curve is more pronounced and gets worse if the button diameter is small with respect to the beam pipe diameter. The general real-time linearization methods usually utilize linear correction combined with a simplistic polynomial, which may lead to inaccuracies in their limited application. We have developed a more rigorous methodology to suppress the non-linear effects of the BPMs through electromagnetic (EM) simulations and 2D fitting approximations. The focus is mainly on standard button pick-ups for the electron (ALBA) and proton machines (LHC).  
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WEPD23 Commissioning of the ALBA Fast Orbit Feedback System 691
 
  • A. Olmos, S. Blanch-Torné, G. Cuní, Z. Martí, J. Moldes, R. Petrocelli, S. Rubio-Manrique, X. Serra-Gallifa, D. Yépez
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
 
  The ALBA Fast Orbit FeedBack system (FOFB) started its commissioning phase in September 2013, when all the required hardware was installed and the development of different controls for the feedback started. This report shows our experience tuning the different parameters to setup the system, together with vibration and beam noise measurements at different conditions. Finally, the present results and future steps for this system are described.  
poster icon Poster WEPD23 [0.902 MB]  
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