Entwicklung der ersten Triggerstufe fuer die Vorwaerts-Driftkammern des ZEUS-Detektors. (Development of the first triggering stage for the forward drift chambers of the ZEUS detector)
(Englisch)
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A concept is introduced to include the forward drift chambers (FTD) of the ZEUS detector into the First Level Trigger (FLT). The algorithms bases on the reconstruction of track points called diamonds in two chambers (FTD 1 and 3). A coincidence method is used to focus on tracks coming from interaction point. The coincidence domain in FTD3 has been set up such that 500 MeV tracks from interaction point are recognized. It is possible to extend the trigger algorithem to combine central and forward drift chamber track information. The FTD drifttimes are distributed over 4 Bunch Crossings (BC) after the event. The General-First-Level-Trigger-Box requires that an event is not longer accepted than 3 BC's. A sophisticated method is shown to create cellhits in order to reach this goal. A supplementary process is introduced to use the time information of all cellhits in one event to issue its time origin. This method accepts an event 1.2 BC's in average. (orig.). (ERA citation 16:018290)
Entwicklung der ersten Triggerstufe fuer die Vorwaerts-Driftkammern des ZEUS-Detektors. (Development of the first triggering stage for the forward drift chambers of the ZEUS detector)