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

Journal Article · · Computer Physics Communications
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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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
ALICE Collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1561949
Journal Information:
Computer Physics Communications, Vol. 242, Issue C; ISSN 0010-4655
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (29)

LHC Machine journal August 2008
The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
  • Alme, J.; Andres, Y.; Appelshäuser, H.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 622, Issue 1 https://doi.org/10.1016/j.nima.2010.04.042
journal October 2010
Overview of trigger systems journal December 2004
RCU2 — The ALICE TPC readout electronics consolidation for Run2 journal December 2013
The ALICE high level trigger: The 2011 run experience conference June 2012
The C-RORC PCIe card and its application in the ALICE and ATLAS experiments journal February 2015
The ALICE high-level trigger read-out upgrade for LHC Run 2 journal January 2016
An overview of openstack architecture conference January 2014
ROOT — An object oriented data analysis framework journal April 1997
High Level Trigger Applications for the ALICE Experiment journal January 2008
An object-oriented network-transparent data transportation framework journal January 2002
ALICE HLT Run 2 performance overview. journal October 2017
Real Time Global Tests of the ALICE High Level Trigger Data Transport Framework journal April 2008
Fast SIMDized Kalman filter based track fit journal March 2008
Event reconstruction in the CBM experiment journal October 2006
A New Approach to Linear Filtering and Prediction Problems journal March 1960
Vc: A C++ library for explicit vectorization: VC: A C++ LIBRARY FOR EXPLICIT VECTORIZATION journal December 2011
Fast TPC Online Tracking on GPUs and Asynchronous Data Processing in the ALICE HLT to facilitate Online Calibration journal December 2015
HIJING 1.0: A Monte Carlo program for parton and particle production in high energy hadronic and nuclear collisions journal December 1994
TPC data compression
  • Berger, Jens; Frankenfeld, Ulrich; Lindenstruth, Volker
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 489, Issue 1-3 https://doi.org/10.1016/S0168-9002(02)00792-1
journal August 2002
A Method for the Construction of Minimum-Redundancy Codes journal September 1952
Efficient TPC data compression by track and cluster modeling
  • Röhrich, Dieter; Vestbø, Anders
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 566, Issue 2 https://doi.org/10.1016/j.nima.2006.06.056
journal October 2006
Support for Online Calibration in the ALICE HLT Framework journal October 2017
Improvements of the ALICE HLT data transport framework for LHC Run 2 journal October 2017
Operational experience with the ALICE High Level Trigger journal December 2012
Improvements of the ALICE HLT data transport framework for LHC Run 2 journal October 2017
An Extreme Processor for an Extreme Experiment journal March 2006
Real Time Global Tests of the ALICE High Level Trigger Data Transport Framework text January 2008
FPGA Co-processor for the ALICE High Level Trigger preprint January 2003

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Related Subjects

97 MATHEMATICS AND COMPUTING
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS