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 46.7: Vortrag
Donnerstag, 1. März 2018, 15:45–16:00, HZO 60
The Kalman filter based track fit in TPC detector — •Artemiy Belousov1,2, Yuri Fisyak4, Ivan Kisel1,2,3, and Maksym Zyzak3 for the CBM collaboration — 1Goethe University Frankfurt — 2FIAS, Germany — 3GSI, Germany — 4Brookhaven National Laboratory
Modern experiments in high energy physics tend to increase the amount of data to be processed, thus, the speed of the algorithms become crucial. However, the efficiency and precision of the applied procedures can not be compromised. Therefore, the Kalman filter method is usually used as the core for reconstruction of collisions, as it satisfies all the requirements.
Current implementation of the Kalman filter method for reconstruction of charged particle trajectories is added to the TPC CA track finder of the STAR experiment within the FAIR Phase 0 program. The algorithm will be applied in the High Level Trigger of STAR during the Beam Energy Scan II (BES II) program, which requires high operational speed. At the same time, quality of the fitting procedure should stay high. The developed Kalman filter based track fit is fully SIMDised and highly optimised, that allows to fulfil the speed requirements.
As a part of preparation to the BES II program the track fiting procedure is required to be extended to the outer ToF and MTD detectors, where the magnetic field and the TPC gas parameters are not homogeneous. The Kalman filter based track fit was modified to cope with these complicated conditions, it shows correct distributions of track parameter residuals and pulls, and χ2.