Basic concepts and architectural details of the Delphi trigger system

Author

Bocci, V. ; Booth, P.S.L. ; Bozzo, M. ; Branco, A. ; Buytaert, J. ; Cairanti, S. ; Canale, R. ; Carniel, R. ; Cerrito, L. ; Charpentier, Ph ; Chorowics, V. ; Donszelmann, M. ; Formenti, F. ; Fuster, J. ; Gaspar, C. ; Gavillet, P. ; Giacomelli, P. ; Harris

Author_Institution

Istituto Nazionale di Fisica Nucl., Rome, Italy

Volume

42

Issue

4

fYear

1995

fDate

8/1/1995 12:00:00 AM

Firstpage

837

Lastpage

843

Abstract

Delphi (DEtector with Lepton, Photon and Hadron Identification) is one of the four experiments of the LEP (Large Electron Positron) collider at CERN. The detector is laid out to provide a nearly 4π coverage for charged particle tracking, electromagnetic, hadronic calorimetry and extended particle identification. The trigger system consists of four levels. The first two are synchronous with the BCO (beam cross over) and rely on hardwired control units, while the last two are performed asynchronously with respect to the BCO and are driven by the Delphi host computers. The aim of this paper is to give a comprehensive global view of the trigger system architecture, presenting in detail the first two levels, their various hardware components and the latest modifications introduced in order to improve their performance and make more user friendly the whole software user interface

Keywords

Cherenkov counters; calorimetry; detector circuits; high energy physics instrumentation computing; nuclear electronics; position sensitive particle detectors; semiconductor counters; trigger circuits; user interfaces; Delphi host computers; Delphi trigger system; architectural details; asynchronous trigger; beam cross over; charged particle tracking; electromagnetic calorimetry; extended particle identification; global view; hadronic calorimetry; hardwired control units; software user interface; synchronous trigger; Calorimetry; Computer architecture; Detectors; Electrons; Hardware; Particle tracking; Photon collider; Positrons; Software performance; User interfaces;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.467783

Filename

467783