Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 13: Poster Session: Heavy Ions
HK 13.2: Poster
Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie
The HADES second level trigger algorithm: principles and first results from experiments with 12C beam — •Alberica Toia, Wolfgang Kuehn, James Ritman, Joerg Lehnert, Markus Petri, Michael Traxler, Ingo Froehlich, Daniel Kirschner, Daniel Schaefer, and Adrian Gabriel — II. Physikalisches Institut, Giessen
The dilepton spectrometer HADES at GSI Darmstadt investigates lepton decays of vector mesons in elementary and heavy ion reactions. Since the branching ratio of these decays is in the order of 10−5, a highly selective real time trigger is needed in order to improve the quality of data and the statistics. This trigger consists of 3 Image Processing Units which perform pattern recognition to detect lepton signatures in different subdetectors and a Matching Unit which combines the position information into tracks to make the final decision. To investigate and characterize the functionality of this trigger, all hardware components have been emulated with software. After testing the emulation with simulated and real data, the performance of the hardware trigger has been investigated with data from recent beamtimes. The goals, methods and results of this analysis will be presented.