The LHCb DAQ system

Author

Jost, Beat

Author_Institution

LHCb Collaboration, CERN, Geneva, Switzerland

Volume

3

fYear

2000

fDate

2000

Abstract

The LHCb experiment is the most recently approved of the 4 experiments under construction at CERN´s LHC accelerator. It is a special purpose experiment designed to precisely measure the CP violation parameters in the B-B system. Triggering poses special problems since the interesting events containing B-mesons are immersed in a large background of inelastic p-p reactions. We therefore decided to implement a 4 level triggering scheme. The LHCb DAQ system will have to cope with an average trigger rate of ~40 kHz, after two levels of hardware triggers, and an average event size of ~150 kB. Thus an event-building network which can sustain an average bandwidth of 6 GB/s is required. A powerful software trigger farm will have to be installed to reduce the rate from the 40 kHz to ~200 Hz of events written to permanent-storage. In this paper we will concentrate on the networking aspects of the LHCb data acquisition and the control system

Keywords

B mesons; CP invariance; Cherenkov counters; calorimeters; colliding beam accelerators; data acquisition; high energy physics instrumentation computing; local area networks; meson decay; nuclear electronics; position sensitive particle detectors; readout electronics; storage rings; synchrotrons; trigger circuits; B-meson decays; CP violation parameters; DAQ system; Ethernet; LHC accelerator; LHCb experiment; RICH detectors; calorimeter system; control system; event filter; event-building network; four-level triggering scheme; hardware triggers; inelastic p-p reactions; microvertex detector; muon detector; networking aspects; readout unit; software trigger farm; special purpose experiment; Bandwidth; Collaboration; Control systems; Data acquisition; Detectors; Hardware; Large Hadron Collider; Mesons; Multiplexing; Spectroscopy;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2000 IEEE

Conference_Location

Lyon

ISSN

1082-3654

Print_ISBN

0-7803-6503-8

Type

conf

DOI

10.1109/NSSMIC.2000.949418

Filename

949418