Title :
Architecture of the DELPHI on-line data acquisition control system
Author :
Charpentier, Ph ; Franek, B. ; Gaspar, C. ; Gavillet, Ph ; Harris, F. ; Jonker, M.
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
Since LEP (Large Electron-Positron storage ring) started running in August 1989, the DELPHI (Detector with Lepton, Photon, and Hadron Identification) experiment has recorded the production of over 400000 Z/sup 0/ vector bosons. The basic design of the process control system of the on-line data acquisition is described. The approach adopted is based on the state manager concept, in which the experiment is described in terms of objects in well-defined states. Commands can be sent to these objects causing them to perform actions and to change state. The complete description of all objects in a simple language is used to generate a set of executable images which run as VMS processes distributed over 20 VAXes and control the 16 subdetectors of DELPHI.<>
Keywords :
Cherenkov counters; computerised instrumentation; data acquisition; physics computing; position sensitive particle detectors; semiconductor counters; DELPHI on-line data acquisition control system; VMS processes; state manager concept; Collaboration; Control systems; Data acquisition; Detectors; Laboratories; Nuclear physics; Object detection; Process design; Production; Voice mail;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.258839
