2-9 September 2007
Victoria, Canada
Europe/Zurich timezone
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HLT Online Calibration framework in ALICE

5 Sep 2007, 17:15
15m
Lecture (Victoria, Canada)

Lecture

Victoria, Canada

oral presentation Online Computing Online computing

Speaker

Mr Sebastian Robert Bablok (Department of Physics and Technology, University of Bergen)

Description

The ALICE HLT is designed to perform event analysis including calibration of the different ALICE detectors online. The detector analysis codes process data using the latest calibration and condition settings of the experiment. This requires a high reliability on the interfaces to the various other systems operating ALICE. In order to have a comparable analysis with the results from Offline, HLT requests the same storage for calibration data, Offline Calibration Database (OCDB). A local caching of its content guarantees a fast and permanent availability of the calibration data during a run. In addition, interactions with the other ALICE online systems (Detector Control System (DCS) and Experiment Control System (ECS)) provide current running conditions like temperatures, trigger settings or the current run number, and allow for synchronizing among the current states. Calibration objects, which are produced online in the HLT cluster, have to be stored in the OCDB after each run, before they can be reused inside the HLT. This guarantees proper versioning of the data and correct assignments of the produced results to the applied settings. A set of dedicated portal nodes of the HLT cluster cover these tasks and take care of the internal distribution and collection of the data as well as of communication and data transfer with the other online and offline systems. Fail safety and redundancy in the design of these interfaces avoids single points of failure and reduces the risk of time delays or data loss.
Submitted on behalf of Collaboration (ex, BaBar, ATLAS) ALICE

Primary author

Mr Sebastian Robert Bablok (Department of Physics and Technology, University of Bergen)

Co-authors

Prof. Bernhard Skaali (Department of Physics, University of Oslo, Norway) Prof. Dieter Röhrich (Department of Physics and Technology, University of Bergen, Norway) Mr Gaute Øvrebekk (Department of Physics and Technology, University of Bergen, Norway) Prof. Harald Appelshäuser (Institute for Nuclear Physics, University of Frankfurt, Germany) Prof. Håvard Helstrup (Faculty of Engineering, Bergen University College, Norway) Mr Jochen Thäder (Kirchhoff Institute of Physics, University of Heidelberg, Germany) Prof. Kjetil Ullaland (Department of Physics and Technology, University of Bergen, Norway) Dr Mateusz Ploskon (Institute for Nuclear Physics, University of Frankfurt, Germany) Mr Matthias Richter (Department of Physics and Technology, University of Bergen, Norway) Mr Per Thomas Hille (Department of Physics, University of Oslo, Norway) Dr Sorina Popescu (Kirchhoff Institute of Physics, University of Heidelberg, Germany) Dr Timm Steinbeck (Kirchhoff Institute of Physics, University of Heidelberg, Germany) Mr Torsten Alt (Kirchhoff Institute of Physics, University of Heidelberg, Germany) Prof. Volker Lindenstruth (Kirchhoff Institute of Physics, University of Heidelberg, Germany)

Presentation Materials