Author: Olexa, J.
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MOPMR029 Experience with DOROS BPMs for Coupling Measurement and Correction 303
  • T. Persson, J.M. Coello de Portugal, A. Garcia-Tabares, M. Gąsior, A. Langner, T. Lefèvre, E.H. Maclean, L. Malina, J. Olexa, P.K. Skowroński, R. Tomás
    CERN, Geneva, Switzerland
  • J. Olexa
    STU, Bratislava, Slovak Republic
  The Diode ORbit and OScillation System (DOROS) system is designed to provide accurate measurements of the beam position in the LHC. The oscillation part of the system, which is able to provide turn-by-turn data, is used to measure the transverse coupling. Since the system provides high resolution measurements for many turns only small excitations are needed to accurately measure the transverse coupling. In this article we present the performance the system to measure coupling and compare it to the BPMs not equipped with this system.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR029  
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WEPMW034 First Operational Experience with Embedded Collimator BPMs in the LHC 2510
  • G. Valentino, G. Baud, R. Bruce, M. Gąsior, J. Olexa, S. Redaelli, A. Valloni, J. Wenninger
    CERN, Geneva, Switzerland
  During Long Shutdown 1, 18 Large Hadron Collider (LHC) collimators were replaced with a new design, in which beam position monitor (BPM) pick-up buttons are embedded in the collimator jaws. The BPMs provide a direct measurement of the beam orbit at the collimators, and therefore can be used to align the collimators more quickly than using the standard technique which relies on feedback from beam losses. Online orbit measurements also mean that margins in the collimation hierarchy placed specifically to cater for unknown orbit drifts can be reduced, therefore increasing the beta-star and luminosity reach of the LHC. In this paper, the first operational results are presented, including a comparison with the standard alignment technique and a fill-to-fill analysis of the measured orbit in different machine modes in the first year of running after the shutdown.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW034  
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