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    Alice hlt tpc tracking of pb-pb events on gpus

    Rohr, David, Gorbunov, Sergey, Szostak, Artur, Kretz, Matthias, Kollegger, Thorsten, Breitner, Timo, Alt, Torsten
    Journal of Physics: Conference Series, 2012, Vol.396(1), p.012044 (8pp) [Peer Reviewed Journal]
    IOPscience (IOP Publishing)
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    Title: Alice hlt tpc tracking of pb-pb events on gpus
    Author: Rohr, David; Gorbunov, Sergey; Szostak, Artur; Kretz, Matthias; Kollegger, Thorsten; Breitner, Timo; Alt, Torsten
    Subject: Physics;
    Description: The online event reconstruction for the ALICE experiment at CERN requires processing capabilities to process central Pb-Pb collisions at a rate of more than 200 Hz, corresponding to an input data rate of about 25 GB/s. The reconstruction of particle trajectories in the Time Projection Chamber (TPC) is the most compute intensive step. The TPC online tracker implementation combines the principle of the cellular automaton and the Kalman filter. It has been accelerated by the usage of graphics cards (GPUs). A pipelined processing allows to perform the tracking on the GPU, the data transfer, and the preprocessing on the CPU in parallel. In order for CPU pre- and postprocessing to keep step with the GPU the pipeline uses multiple threads. A splitting of the tracking in multiple phases searching for short local track segments first improves data locality and makes the algorithm suited to run on a GPU. Due to special optimizations this course of action is not second to a global approach. Because of non-associative floating-point arithmetic a binary comparison of GPU and CPU tracker is infeasible. A track by track and cluster by cluster comparison shows a concordance of 99.999%. With current hardware, the GPU tracker outperforms the CPU version by about a factor of three leaving the processor still available for other tasks.
    Is part of: Journal of Physics: Conference Series, 2012, Vol.396(1), p.012044 (8pp)
    Identifier: 1742-6588 (ISSN); 1742-6596 (E-ISSN); 10.1088/1742-6596/396/1/012044 (DOI)

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    Hadron Formation and the Phase Diagram of QCD Matter

    Stock, Reinhard, Becattini, Francesco, Kollegger, Thorsten, Mitrovski, Michael, Schuster, Tim
    arXiv.org, Jul 17, 2013
    © ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
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    Title: Hadron Formation and the Phase Diagram of QCD Matter
    Author: Stock, Reinhard; Becattini, Francesco; Kollegger, Thorsten; Mitrovski, Michael; Schuster, Tim
    Contributor: Schuster, Tim (pacrepositoryorg)
    Subject: Phase Diagrams ; Organic Chemistry ; Quantum Chromodynamics
    Description: We investigate hadronic species freeze-out systematics in A+A collisions at low SPS energies, corresponding to a baryochemical potential above 300 MeV, analyzing NA49 hadron production data in the framework of the statistical hadronization model, and in the UrQMD hadronic transport model. Observing no deviation from universal grand canonical hadro-chemical equilibrium freeze-out, we argue that the observed hadronic freeze-out points should universally signal the boundary line of the hadronic phase in the QCD matter phase diagram.
    Is part of: arXiv.org, Jul 17, 2013
    Identifier: 2331-8422 (E-ISSN)

    • Several versions

    ALICE HLT TPC Tracking of Pb-Pb Events on GPUs

    Rohr, David, Gorbunov, Sergey, Szostak, Artur, Kretz, Matthias, Kollegger, Thorsten, Breitner, Timo, Alt, Torsten
    arXiv.org, Dec 26, 2017

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    Hadron Formation in Relativistic Nuclear Collisions and the QCD Phase Diagram

    Becattini, Francesco, Bleicher, Marcus, Kollegger, Thorsten, Schuster, Tim, Steinheimer, Jan, Stock, Reinhard
    arXiv.org, Jul 31, 2013 [Peer Reviewed Journal]
    © ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
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    Title: Hadron Formation in Relativistic Nuclear Collisions and the QCD Phase Diagram
    Author: Becattini, Francesco; Bleicher, Marcus; Kollegger, Thorsten; Schuster, Tim; Steinheimer, Jan; Stock, Reinhard
    Contributor: Stock, Reinhard (pacrepositoryorg)
    Subject: Collisions ; Data Analysis ; Regeneration ; Phase Diagrams ; Quantum Chromodynamics ; Statistical Models ; Synchrotrons ; Survival
    Description: We analyze hadrochemical freeze-out in central Pb+Pb collisions at CERN SPS and LHC energies. We determine the effects of baryon and antibaryon annihilation and/or regeneration occurring during the final cascade expansion stage of the collisions by deriving "survival factors" for each hadronic species and all energies considered by employing the UrQMD hybrid model. These survival factors are shown to resemble the pattern of data deviation from the statistical equilibrium calculations with the statistical model. We apply them in the SM data analysis, obtaining new points in the \(T-\mu_B\) plane which follow closely the parton-hadron phase boundary predicted by lattice QCD.
    Is part of: arXiv.org, Jul 31, 2013
    Identifier: 2331-8422 (E-ISSN); 10.1103/PhysRevLett.111.082302 (DOI)

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    Hadron Formation in Relativistic Nuclear Collisions and the QCD Phase Diagram

    Becattini, Francesco, Bleicher, Marcus, Kollegger, Thorsten, Schuster, Tim, Steinheimer, Jan, Stock, Reinhard
    Cornell University
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    Title: Hadron Formation in Relativistic Nuclear Collisions and the QCD Phase Diagram
    Author: Becattini, Francesco; Bleicher, Marcus; Kollegger, Thorsten; Schuster, Tim; Steinheimer, Jan; Stock, Reinhard
    Subject: Nuclear Theory ; High Energy Physics - Phenomenology
    Description: We analyze hadrochemical freeze-out in central Pb+Pb collisions at CERN SPS and LHC energies. We determine the effects of baryon and antibaryon annihilation and/or regeneration occurring during the final cascade expansion stage of the collisions by deriving "survival factors" for each hadronic species and all energies considered by employing the UrQMD hybrid model. These survival factors are shown to resemble the pattern of data deviation from the statistical equilibrium calculations with the statistical model. We apply them in the SM data analysis, obtaining new points in the $T-\mu_B$ plane which follow closely the parton-hadron phase boundary predicted by lattice QCD. Comment: Updated version as accepted by Physical Review Letters
    Identifier: 1212.2431 (ARXIV ID)

    • Several versions

    Hadronization and Hadronic Freeze-Out in Relativistic Nuclear Collisions

    Becattini, Francesco, Bleicher, Marcus, Kollegger, Thorsten, Mitrovski, Michael, Schuster, Tim, Stock, Reinhard
    arXiv.org, Apr 12, 2012 [Peer Reviewed Journal]

    • Several versions

    Shared Memory Transport for ALFA

    Rybalchenko, Alexey, Klein, Dennis, Al-Turany, Mohammad, Kollegger, Thorsten
    EPJ Web of Conferences, Vol.214 [Peer Reviewed Journal]

    • Several versions

    RDMA-accelerated data transport in ALFA

    Klein, Dennis, Rybalchenko, Alexey, Al-Turany, Mohammad, Kollegger, Thorsten
    EPJ Web of Conferences, Vol.214 [Peer Reviewed Journal]

    • Several versions

    XRootD plug-in based solutions for site specific require-ments

    Knedlik, Jan, Kramp, Paul, Schwarz, Kilian, Kollegger, Thorsten
    EPJ Web of Conferences, Vol.214 [Peer Reviewed Journal]

    • Several versions

    The ALICE Analysis Facility Prototype at GSI

    Schwarz Kilian, Fleischer Soeren, Grosso Raffaele, Knedlik Jan, Kollegger Thorsten, Kramp Paul
    EPJ Web of conferences, 01 January 2019, Vol.214, p.08027 [Peer Reviewed Journal]