Title :
The ZEUS first and second level trigger
Author :
Boterenbrood, H. ; O´Dell, Vivian ; Uijterwaal, H.A.J.R. ; Vermeulen, J.C. ; Wiggers, L.W. ; van Woudenberg, R. ; Hazumi, M. ; Nakao, Masahiro ; Tokushuku, K. ; Smith, W.H.
Abstract :
The ZEUS trigger has a three-level structure. At the first level, data are processed in a pipelined manner, while the readout data are kept in analog or digital pipelines. At the second-level, arrays of microprocessors analyze the digitized data to reduce the trigger rate by a factor of 10 from 1 kHz to 100 Hz. After the event has been assembled by the event builder, it is analyzed by a processor station, part of a farm of 36 stations, providing an event reduction of by factor of 10-20. The maximum rate of events (a mixture of background, almost real photoproduction, and deep-inelastic scattering events) that can be written to tape at the DESY-IBM after the selection in the three-level trigger system is 5-10 Hz at an average event size of about 100 Kbyte
Keywords :
microcomputer applications; nuclear electronics; physics computing; pipeline processing; scintillation counters; trigger circuits; 0.1 to 1 kHz; DESY-IBM; ZEUS; analog pipelines; average event size; deep-inelastic scattering; digital pipelines; digitized data; event builder; event reduction; first level; maximum rate; microprocessors; pipelined manner; processor station; readout data; second level trigger; three-level structure; trigger rate; Clocks; Data analysis; Detectors; Electron accelerators; Large Hadron Collider; Microprocessors; Particle scattering; Pipelines; Proton accelerators; Synchronization;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301246
