Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Heavy Ion Collision and QCD Phases XII
HK 65.2: Vortrag
Freitag, 18. März 2016, 14:30–14:45, S1/01 A01
Parallel 4-Dimensional Cellular Automaton Track Finder for the CBM Experiment — •Valentina Akishina1,2,3,4 and Ivan Kisel1,2,3 for the CBM collaboration — 1Goethe-Universität Frankfurt am Main, Frankfurt am Main, Germany — 2Frankfurt Institute for Advanced Studies, Frankfurt am Main, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 4JINR Joint Institute for Nuclear Research, Dubna, Russia
The CBM experiment at FAIR will focus on the measurement of rare probes at interaction rates up to 10 MHz. The beam will provide free stream of particles, so that information about different collisions may overlap in time. It requires the full online event reconstruction not only in space, but also in time, so-called 4D (4-dimensional) event building. This is a task of the First-Level Event Selection (FLES) package. The FLES reconstruction package consists of several modules: track finding, track fitting, short-lived particles finding, event building and selection.
The Silicon Tracking System (STS) time measurement information was included into the Cellular Automaton (CA) track finder algorithm. The 4D track finder algorithm speed (8.5 ms per event in a time-slice) and efficiency is comparable with the event-based analysis. The CA track finder was fully parallelised inside the time-slice. The parallel version achieves a speed-up factor of 10.6 while parallelising between 10 Intel Xeon physical cores with a hyper-threading. The first version of event building based on 4D track finder was implemented. Supported by FIAS, HICforFAIR, HGS-HIRe and Hessischen Ministerium für Wissenschaft und Kunst.