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The CDF II detector uses dedicated hardware to identify charged tracks that are used in an important class of Level 1 trigger decisions. Until now, this hardware identified track segments based on patterns of hits on only the axial sense wires in the tracking chamber and determined the transverse momentum of track candidates from patterns of track segments. This identification is efficient but produces...
To test the feasibility of using remote farms to perform real-time event selection in the trigger/data acquisition system for the ATLAS experiment at CERN, a proof of concept was set up during 2004. The behaviour of the request-response protocol to move application data has been measured for remote farms connected with different wide area networks including a dedicated lightpath, a virtual private...
In the ATLAS experiment at the LHC, the output of readout hardware specific to each subdetector will be transmitted to buffers, located on custom made PCI cards ("ROBINs"). The data consist of fragments of events accepted by the first-level trigger at a maximum rate of 100 kHz. Groups of four ROBINs will be hosted in about 150 read-out subsystem (ROS) PCs. Event data are forwarded on request...
The ATLAS collaboration at CERN operated a combined test beam (CTB) from May until November 2004. The prototype of ATLAS data acquisition system (DAQ) was used to integrate other subsystems into a common CTB setup. Data were collected synchronously from all the ATLAS detectors, which represented nine different detector technologies. Electronics and software of the first level trigger were used to...
The CDF experiment studies proton-anti-proton collisions using the Tevatron collider. Interesting events are identified using a three level trigger system, with each level utilizing more detailed information to select and pass on events. Since the start of Run II, the trigger and data acquisition systems have worked well. Over the next few years, the Tevatron will begin to operate at luminosities...
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