Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 41: Accelerators and Instrumentation II

HK 41.9: Talk

Tuesday, March 17, 2009, 18:45–19:00, H-ZO 90

ALICE HLT Tracking — •Sergey Gorbunov — Kirchhoff-Institut für Physik, Heidelberg, Germany

A fast tracking algorithm has been developed for ALICE High Level Trigger. The algorithm reconstructs all kinds of data including physics p-p and Pb-Pb events, cosmics and laser calibration events. For the pattern recognition a Cellular Automaton method is used, while the track fit is performed with a Kalman filter. The algorithm shows high quality and speed. It performs all the calculations in parallel which allows one to use fast multiprocessor hardware for the HLT event reconstruction, thus increasing the speed of data processing by an order of magnitude. The reconstruction efficiency for heavy ion events is ~96% and the speed is 1300 ms/event on a current CPU and only 140 ms/event on a modern GPU card. The algorithm is intended for on-line data processing in the High Level Trigger of the ALICE experiment.