Frei, Regina (2009) LHCb Silicon Tracker DAQ and DCS online systems. In: 2009 16th IEEE-NPSS Real Time Conference, 10-15 May 2009, Beijing, China.
Type of Research: | Conference, Symposium or Workshop Item |
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Creators: | Frei, Regina |
Description: | The LHCb experiment at the Large Hadron Collider (LHC) at CERN in Geneva (Switzerland) is designed to perform precision measurements of b quark decays. The Silicon Tracker (ST) plays a crucial role in reconstructing particle trajectories and consists of two silicon micro-strip detectors, the Tracker Turicensis upstream of the LHCb magnet and the Inner Tracker downstream. The radiation environment and the magnetic field represent new challenges for the implementation of a Detector Control System (DCS) and the data acquisition (DAQ).The DAQ has to deal with ~272 K analog read-out channels, 2 K read-out chips and real time DAQ at a rate of 1.1 MHz with data processing at TELL1 level. The TELL1 real time algorithms for clustering thresholds and other computations run on dedicated FPGAs that implement 13 K configurable parameters per board, in total 1.17 M parameters for the ST. After data processing the total throughput amounts to about 6.4 GB from an input data rate of ~337 GB per second. A finite state machine based hierarchical control system is the fundamental of the DCS and allows distributed control access and multi-platform use. The implementation of the DCS system for two sub-detectors requires a design which can be used for TT and IT which have a different hardware mapping. With the DCS an operator is able to control the power supplies, to program the read-out chips and to monitor online the state of all the hardware in the read-out chain. It features as well a monitoring of temperature and humidity readings and can take automated actions on warnings or alarms. To guarantee safe operation a completely independent, hardware-based system is used for the 'vital' alarms to ensure redundancy. |
Keywords/subjects not otherwise listed: | Control system, Distributed control, Hardware, hierarchical finite state machines, Large Hadron Collider, Magnetic field measurement, Particle tracking, Performance evaluation, Silicon |
Publisher/Broadcaster/Company: | IEEE |
Your affiliations with UAL: | Colleges > London College of Fashion |
Date: | May 2009 |
Digital Object Identifier: | 10.1109/RTC.2009.5321949 |
Event Location: | Beijing, China |
Date Deposited: | 06 Aug 2024 13:45 |
Last Modified: | 14 Aug 2024 14:18 |
Item ID: | 22334 |
URI: | https://ualresearchonline.arts.ac.uk/id/eprint/22334 |
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