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https://doi.org/10.18429/JACoW-ICALEPCS2017-THDPL01
Title Configuring and Automating an LHC Experiment for Faster and Better Physics Output
Authors
  • C. Gaspar, R. Aaij, F. Alessio, J. Barbosa, L.G. Cardoso, M. Frank, B. Jost, N. Neufeld, R. Schwemmer
    CERN, Geneva, Switzerland
Abstract LHCb has introduced a novel online detector alignment and calibration for LHC Run II. This strategy allows for better trigger efficiency, better data quality and direct physics analysis at the trigger output. This implies: running a first High Level Trigger (HLT) pass synchronously with data taking and buffering locally its output; use the data collected at the beginning of the fill, or on a run-by-run basis, to determine the new alignment and calibration constants; run a second HLT pass on the buffered data using the new constants. Operationally, it represented a challenge: it required running different activities concurrently in the farm, starting at different times and load balanced depending on the LHC state. However, these activities are now an integral part of LHCb's dataflow, seamlessly integrated in the Experiment Control System and completely automated under the supervision of LHCb's 'Big Brother'. In total, around 60000 tasks run in the ~1600 nodes of the farm. Load balancing of tasks between activities takes less than 1 second. The mechanisms for configuring, scheduling and synchronizing different activities on the farm and in the experiment in general will be discussed.
Paper download THDPL01.PDF [1.815 MB / 7 pages]
Slides download THDPL01_TALK.PDF [3.600 MB]
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Conference ICALEPCS2017, Barcelona, Spain
Series International Conference on Accelerator and Large Experimental Control Systems (16th)
Proceedings Link to full ICALEPCS2017 Proccedings
Session Experiment Control 2
Date 12-Oct-17   16:00–16:45
Main Classification Experiment Control
Keywords ion, controls, experiment, alignment, detector
Publisher JACoW, Geneva, Switzerland
Editors Volker RW Schaa (GSI, Darmstadt, Germany); Isidre Costa (ALBA-CELLS, Cerdanyola del Vallès, Spain); David Fernández (ALBA-CELLS, Cerdanyola del Vallès, Spain); Óscar Matilla (ALBA-CELLS, Cerdanyola del Vallès, Spain)
ISBN 978-3-95450-193-9
Published January 2018
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