Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 25: Instrumentation und Anwendungen III
HK 25.4: Vortrag
Mittwoch, 19. März 2003, 12:15–12:30, C
Performance of the Trigger System of the HADES Detector — •Alberica Toia1, Ingo Fröhlich1, Adrian Gabriel1, Daniel Kirschner1, Wolfgang Kühn1, Jörg Lehnert1, Erik Lins1, Tiago Perez1, Markus Petri1, James Ritman1, Andrei Sokolov1, Daniel Schäfer1, Michael Traxler2, and Wolfgang Koenig2 — 1II. Physikalisches Institut, Giessen — 2GSI, Darmstadt
The HADES detector at GSI Darmstadt is built to investigate the production of lepton pairs in hadron and heavy ion induced reactions up to 2 AGeV. The second level trigger system (LVL2) is designed to reduce the event rate up to a factor of 100 by selecting lepton pairs within a given invariant mass window.
The LVL2 consists of Image Processing Units (IPU) which perform pattern recognition to detect lepton signatures in different subdetectors and a Matching Unit (MU) which combines the position and momentum information of these signatures into tracks to select events with lepton pairs of given invariant mass.
To investigate and characterize the functionality of this trigger, all hardware components have been emulated in software. Since the recognition of Cherenkov rings is the most selective algorithm of the trigger, its behavior has been studied with the help of simulations and by comparing it to the offline analysis algorithm in a dedicated experiment. The goals, methods and results of this analysis will be presented.
This work was partly supported by BMBF, NATO and GSI.