Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Schwerionenkollisionen und QCD Phasen

HK 29.6: Vortrag

Mittwoch, 21. März 2012, 15:30–15:45, P 5

Pattern Recognition for a Continuously Operating GEM-TPC — •Johannes Rauch — Technische Universität München

A pattern recognition software for a continuously operating high rate Time Projection Chamber with Gas Electron Multiplier amplification (GEM-TPC) has been designed and tested. A track-independent clustering algorithm delivers space points. A true 3-dimensional track follower combines them to helical tracks, without constraints on the vertex position. Fast helix fits, based on a conformal mapping on the Riemann sphere, are the basis for deciding whether points belong to one track.

The software has been tested on simulated as well as on real data taken in a physics run of the GEM-TPC prototype installed in the FOPI detector at GSI facility, Germany. To assess the performance of the algorithm in a high-rate environment, pp-interactions corresponding to a maximum average track density of 0.5 cm/cm³ have been simulated.

The pattern recognition is capable of finding all kinds of track topologies with high efficiency and provides excellent seed values for fitting or online event selection. Computational costs are O(50) ms/track on a 3.1 GHz office PC. Parallel implementation of the code on a graphics processing unit (GPU) is under investigation.

Structure, functioning and benchmark results of the algorithm will be presented.