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

S Acharya, Jonatan Adolfsson, Peter Christiansen, Martin Ljunggren, Adrian Nassirpour, Anders Oskarsson, Tuva Richert, Omar Vazquez Rueda, David Silvermyr, Evert Stenlund, N Zurlo, ALICE Collaboration

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Pages (from-to)25-48
Number of pages24
JournalComputer Physics Communications
Volume242
DOIs
Publication statusPublished - 2019

Subject classification (UKÄ)

  • Subatomic Physics

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