1. A two level fastbus based trigger system for CDF
- Author
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George Redlinger, H. Sanders, Luciano Ristori, Mauro Dell'Orso, Tony Liss, J. Ting, A. Roodman, C. Grosso-Pilcher, Henry J. Frisch, D. Amidei, Y. D. Tsai, M. Campbell, Paola Giannetti, Jay Hauser, and M. J. Shochet
- Subjects
Physics ,Nuclear and High Energy Physics ,Muon ,business.industry ,Event (computing) ,Detector ,Topology (electrical circuits) ,law.invention ,Calorimeter ,Nuclear physics ,law ,Fermilab ,Collider ,business ,Instrumentation ,Beam (structure) ,Computer hardware - Abstract
We describe a two level FASTBUS based trigger processor designed and built for the CDF detector at the Fermilab p p collider. The Level 1 decision is based on the global energy deposition in the calorimeters as well as on the presence of muon candidates and stiff tracks in the central drift chamber. The Level 1 decision is made in the 3.5 μs between beam crossings, incurring no deadtime while reducing a raw event rate of 50–75 kHz to a few kHz. The remaining events are passed on to Level 2. The Level 2 decision is driven by the topology of the event, operating on calorimeter clusters, central stiff tracks and muon candidates. Level 2 is designed to reduce the rate to 1–100 Hz, incurring less than 10% deadtime, before initiating readout of all the detector elements. A large fraction of the trigger hardware is used for both the Level 1 and Level 2 decisions.
- Published
- 1988