Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 46: Heavy Ion Collisions and QCD Phases VII
HK 46.6: Vortrag
Donnerstag, 1. März 2018, 15:30–15:45, HZO 60
Time-based reconstruction of free-streaming data in the CBM experiment. — •Valentina Akishina1, Iouri Vassiliev2, Ivan Kisel1,2,3, and Maksym Zyzak2 for the CBM collaboration — 1Goethe-Universitat Frankfurt am Main — 2GSI Helmholtzzentrum fur Schwerionenforschung GmbH — 3Frankfurt Institute for Advanced Studies
The CBM experiment at FAIR will focus on very rare probe measurements. In order to obtain sufficient statistics, the experiment will operate at high interaction rates of up to 10 MHz. In this case resolving different collisions, which overlap in time, is a nontrivial task. Moreover, most of the trigger signatures are complex and require information from several detector subsystems. This makes traditional trigger architectures inapplicable for the CBM experiment. Thus, CBM needs a novel data read-out and analysis concept based on free streaming front-end electronics. CBM will collect time-stamped data into a readout buffer and deliver it to a large computer farm called First Level Event Selection (FLES) for online reconstruction.
Event building requires full online event reconstruction taking into account not only space coordinates, but also time measurements, so-called 4D reconstruction. The FLES reconstruction package consists of several modules: track finding, track fitting, event building, short-lived particles finding, and event selection, which allow reconstructing time-slices in parallel (between processor cores). The reconstruction procedure and the obtained results for simulated collisions in CBM are presented.