Real-time data processing in the ALICE High Level Trigger at the LHC
Özet
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. (C) 2019 Elsevier B.V. All rights reserved.
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