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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.33: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

The COMPASS Online Filter — •Roland Kuhn, Thiemo Nagel, Stephan Paul, and Lars Schmitt — TU München, Physik-Department E18, 85747 Garching

COMPASS is a high rate fixed target experiment, taking data at the SPS at CERN. Due to the stringent time constraint at the first trigger level an acceptable trigger rate can only be achieved at the cost of a lower purity. The physics selectivity can be greatly enhanced by allowing higher first level rates and enriching the interesting data after event assembly, which saves storage space and reconstruction time. This also leads to a reduction of trigger dead time, if hardware vetoes are partly replaced by software filtering. The concept of the filter software along with first performance results from the 2003 run of COMPASS will be presented.