Berlin 2005 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 41: Instrumentation und Anwendungen
HK 41.3: Talk
Wednesday, March 9, 2005, 14:30–14:45, TU MA041
Cinderella: an Online Filter for the COMPASS experiment † — •Thiemo Nagel, Annemarie Dinkelbach, Jan Friedrich, Roland Kuhn, Stephan Paul, and Lars Schmitt — TU München, Physik Department E18
In the 2004 COMPASS beam time, for the first time the Cinderella Online Filter (2nd-level trigger) was used in production. By partially removing 1st-level trigger impurities, the limited storage and bandwidth are utilized better, allowing to take more physics data. The ability to reconstruct a beam track is demanded when filtering muon data, while for hadron data, track multiplicities in hodoscopes and silicon microstrip detectors are used for event selection.
Data reduction of 25% of undesired events is achieved at loss of less than 1% of useful data. The workload of ∼5000 events per second is processed on a cluster with 26 CPUs in parallel.
† This work is supported by the BMBF and the Maier-Leibnitz-Labor, Garching.