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").

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PC (update 03 Nov 98)