The FINUDA Online Monitoring

and Event Display System

Detector Configuration and Event Buffer Structure

The buffer/monitor structure is closely related to the design of the FINUDA detector, sitting around the beam crossing point, summarized in the following:

• An inner region, between the beam pipe and the cylindrical/octagonal target, whose task is the identification of K+K- pairs, both for triggering and for offline event selection:
• a barrel of 12 thin scintillators, surrounding the beam pipe ("tof");
• a layer of 8 double sided silicon strip detectors ("ism");




• An outer region, surrounding the target, optimized to get the best resolution for pions produced in the hypernuclear formation, and to detect the neutrons coming from non-mesonic hypernuclear decays:
• a layer of 10 double sided silicon strip detectors ("osm");
• two layers of 8 Drift Chambers, filled with a Helium based mixture ("lmd");
• a system of 6 layers of 404 Straw Tubes each ("stb");
• a barrel of 72 thick scintillators ("tof");

The event buffer, coming from the DAQ system, also contains some information concerning the trigger system configuration ("gts") and, eventually, the slow controls ("slc").