Keyword: dipole
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TUPHA119 Online Coupling Measurement and Correction Throughout the LHC Cycle ion, coupling, software, operation 686
  • G.H. Hemelsoet, A. Calia, K. Fuchsberger, M. Gabriel, M. Hostettler, M. Hruska, D. Jacquet, T. Persson, M.E. Soderen, D. Valuch
    CERN, Geneva, Switzerland
  With high intensity beams, a precise measurement and effective correction of the betatron coupling is essential for the performance of the Large Hadron Collider (LHC). In order to measure this parameter, the LHC transverse damper(ADT), used as an AC dipole, will provide the necessary beam excitation. The beam oscillations will be recorded by the Beam Positions Monitors and transmitted to dedicated analysis software. We set up the project with a 3-layer software architecture: The central node is a java server orchestrating the different actors: The Graphical User Interface, the control and triggering of the ADT AC dipole, the BPMs, the oscillation analysis (partly in python), and finally the transmission of the correction values. The whole system, is currently being developed in a team using Scrum, an iterative and incremental agile software development framework. In this paper we present an overview of this system, experience from machine development and commissioning as well as how scrum helped us to achieve our goals. Improvement and re-use of the architecture with a nice decoupling between data acquisition and data analysis are also briefly discussed.  
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