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Anvar, S.; Bugeon, F.; Debu, P.; Fallou, J.L.; Provost, H.Le; Louis, F.; Mur, M.; Schanne, S.; Tarte, G.; Vallage, B.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 12/1998, Volume: 419, Issue: 2-3Journal Article
The NA48 charged trigger is a mixed hardware and software real-time processing system intended to detect the interesting configurations of K0 charged decays. It achieves real-time event building, track reconstruction and kinematics computation on drift chamber data at an event rate of 100kHz and within a maximum decision latency of 100μs. The system uses data driven, FPGA-based coordinate builders, a hardware event builder based on a crossbar switch, and a farm of up to 16 event processors for its software part. It has been installed and operated at CERN since 1995. After a description of the constraints and architecture of the various subsystems, the paper gives an account of the results and performance of the system based on the 1996/1997 runs. More specifically, the replacement of the present DSP-based implementation of the processing farm by RISC processors will be discussed.
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