Author :
Adler, C. ; Berger, J. ; Demello, M. ; Flier, D. ; Landgraf, J. ; Lange, J.S. ; LeVine, M.J. ; Lindenstruth, V. ; Ljubicic, A., Jr. ; Nelson, J. ; Roehrich, D. ; Schafer, E. ; Schambach, J.J. ; Schmischke, D. ; Schulz, M.W. ; Stock, R. ; Struck, C. ; Yepe
Abstract :
The level-3 trigger system of the STAR experiment will in the final stage consist of a farm of 24 ALPHA/Linux processors, interconnected by SCI (Scalable Coherent Interface). The system will perform online tracking of Ntrack⩾8000 tracks per event (Npoint⩽45 per track). The track data will be transferred to a global level-3 CPU (expected data transfer rate ≃48 MB/s), performing online event analysis tasks (e.g. invariant mass reconstruction) with a design trigger input rate of R=100 Hz (R=20 Hz for a prototype system)
Keywords :
data acquisition; high energy physics instrumentation computing; system buses; time projection chambers; ALPHA/Linux processors; STAR experiment; Scalable Coherent Interface; invariant mass reconstruction; online event analysis tasks; online tracking; proposed level-3 trigger system; Data acquisition; Event detection; LAN interconnection; Laboratories; Large-scale systems; Mass production; Particle production; Particle tracking; Performance analysis; Prototypes;
