0435745 - ÚJF 2015 RIV GB eng C - Conference Paper (international conference)
Ananya, A. - Agrawal, N. - Kushpil, Svetlana … Total 91 authors
O-2: A novel combined online and offline computing system for the ALICE Experiment after 2018.
Journal of Physics Conference Series. Vol. 513. Bristol: IOP Publishing Ltd, 2014, 012037. ISSN 1742-6588.
[20th International Conference on Computing in High Energy and Nuclear Physics (CHEP). Amsterdam (NL), 14.10.2013-18.10.2013]
R&D Projects: GA MŠMT(CZ) LG13031
Institutional support: RVO:61389005
Keywords : ALICE * heavy ion collisions * detectors
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
DOI: https://doi.org/10.1088/1742-6596/513/1/012037

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.
Permanent Link: http://hdl.handle.net/11104/0239643