Real-time data processing in the ALICE High Level Trigger at the LHC

S. Acharya , Łukasz Graczykowski , M.J. Jakubowska , Małgorzata Janik , Adam Kisiel , Julian Myrcha , Jeremi Niedziela , Janusz Oleniacz , Jan Pluta , Przemysław Rokita , Krystian Rosłon , Tomasz Trzciński , Hanna Zbroszczyk

Abstract

At the Large Hadron Collider at CERN in Geneva, Switzerland, atomic nuclei are collided at ultra-relativistic energies. Many final-state particles are produced in each collision and their properties are measured by the ALICE detector. The detector signals induced by the produced particles are digitized leading to data rates that are in excess of 48 GB/s. The ALICE High Level Trigger (HLT) system pioneered the use of FPGA- and GPU-based algorithms to reconstruct charged-particle trajectories and reduce the data size in real time. The results of the reconstruction of the collision events, available online, are used for high level data quality and detector-performance monitoring and real-time time-dependent detector calibration. The online data compression techniques developed and used in the ALICE HLT have more than quadrupled the amount of data that can be stored for offline event processing.
Collective authorALICE Collaboration
Author S. Acharya - [Variable Energy Cyclotron Centre India]
S. Acharya,,
-
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, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, M.J. Jakubowska - [Politechnika Warszawska]
M.J. Jakubowska,,
-
-
, Małgorzata Janik (FP / NPD)
Małgorzata Janik,,
- Nuclear Physics Division
, Adam Kisiel (FP / NPD)
Adam Kisiel,,
- Nuclear Physics Division
, Julian Myrcha (FEIT / IN)
Julian Myrcha,,
- The Institute of Computer Science
, Jeremi Niedziela (FP / NPD)
Jeremi Niedziela,,
- Nuclear Physics Division
, Janusz Oleniacz (FP / NPD)
Janusz Oleniacz,,
- Nuclear Physics Division
, Jan Pluta (FP / NPD)
Jan Pluta,,
- Nuclear Physics Division
, Przemysław Rokita (FEIT / IN)
Przemysław Rokita,,
- The Institute of Computer Science
et al.`
Total number of authors998
Journal seriesComputer Physics Communications, ISSN 0010-4655, (A 45 pkt)
Issue year2019
Vol242
Pages25-48
Publication size in sheets1.15
Keywords in EnglishFPGA, GPU
ASJC Classification3106 Nuclear and High Energy Physics
DOIDOI:10.1016/j.cpc.2019.04.011
URL https://doi.org/10.1016/j.cpc.2019.04.011
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 13-07-2019, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 2.224; WoS Impact Factor: 2017 = 3.748 (2) - 2017=4.284 (5)
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