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O-2: A novel combined online and offline computing system for the ALICE Experiment after 2018
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SYSNO ASEP 0435745 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title O-2: A novel combined online and offline computing system for the ALICE Experiment after 2018 Author(s) Ananya, A. (IN)
Agrawal, N. (IN)
Kushpil, Svetlana (UJF-V) RID, ORCID, SAINumber of authors 91 Source Title Journal of Physics Conference Series, 513 - 20th International Conference on Computing in High Energy and Nuclear Physics (CHEP2013). - Bristol : IOP Publishing Ltd, 2014 - ISSN 1742-6588 Pages 012037 Number of pages 7 s. Publication form Print - P Action 20th International Conference on Computing in High Energy and Nuclear Physics (CHEP) Event date 14.10.2013-18.10.2013 VEvent location Amsterdam Country NL - Netherlands Event type WRD Language eng - English Country GB - United Kingdom Keywords ALICE ; heavy ion collisions ; detectors Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders R&D Projects LG13031 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UJF-V - RVO:61389005 UT WOS 000342287200037 DOI https://doi.org/10.1088/1742-6596/513/1/012037 Annotation ALICE is a detector dedicated to the studies with heavy ion collisions exploring the physics of strongly interacting nuclear matter and the quark-gluon plasma at the CERN LHC. After the second long shutdown of the LHC, the ALICE Experiment will be upgraded to make high precision measurements of rare probes at low PT, which cannot be selected with a trigger, and therefore require a very large sample of events recorded on tape. The online computing system will be completely redesigned to address the major challenge of sampling the full 50 kHz Pb-Pb interaction rate increasing the present limit by a factor of 100. This upgrade will also include the continuous un-triggered read-out of two detectors: ITS and TPC producing a sustained throughput of 1 TB/s. This unprecedented data rate will be reduced by adopting an entirely new strategy where calibration and reconstruction are performed online, and only the reconstruction results are stored while the raw data are discarded. This system, already demonstrated in production on the TPC data since 2011, will be optimized for the online usage of reconstruction algorithms. This implies much tighter coupling between online and offline computing systems. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2015
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