CERN Accelerating science

CMS Note
Report number CMS-CR-2007-020
Title The Terabit/s Super-Fragment Builder and Trigger Throttling System for the Compact Muon Solenoid Experiment at CERN
Author(s) Bauer, Gerry (MIT) ; Varela, Joao (LIP, Lisbon ; CERN) ; Boyer, Vincent (CERN) ; Branson, James (UC, San Diego) ; Brett, Angela (CERN) ; Cano, Eric (CERN) ; Carboni, Andrea (CERN) ; Ciganek, Marek (CERN) ; Cittolin, Sergio (CERN) ; Erhan, Samim (CERN ; UCLA) Show all 40 authors
Affiliation (CERN) ; (Fermilab) ; (INFN Legarno, Italy) ; (Kyungpook National Univ., South Korea) ; (LIP, Lisbon, Portugal) ; (Massachusetts Inst. Technol., Cambridge, MA, USA) ; (UCLA) ; (Univ. California, San Diego, CA, USA) ; (Vienna, Tech. U.)
Submitted to 15th IEEE Real Time Conference 2007, Fermilab, Batavia, IL, USA, 29 Apr - 4 May 2007
Submitted by 11 May 2007
Subject category Detectors and Experimental Techniques
Accelerator/Facility, Experiment CERN LHC ; CMS
Free keywords ACQUISITION
Abstract The Data Acquisition System of the Compact Muon Solenoid experiment at the Large Hadron Collider reads out event fragments of an average size of 2 kilobytes from around 650 detector front-ends at a rate of up to 100 kHz. The first stage of event-building is performed by the Super-Fragment Builder employing custom-built electronics and a Myrinet optical network. It reduces the number of fragments by one order of magnitude, thereby greatly decreasing the requirements for the subsequent event-assembly stage. By providing fast feedback from any of the front-ends to the trigger, the Trigger Throttling System prevents buffer overflows in the front-end electronics due to variations in the size and rate of events or due to back-pressure from the down-stream event-building and processing. This paper reports on new performance measurements and on the recent successful integration of a scaled-down setup of the described system with the trigger and with front-ends of all major sub-detectors. The on-going commissioning of the full-scale system is discussed.
Copyright/License Preprint: (License: CC-BY-4.0)

Corresponding record in: Inspire


 Record created 2007-07-13, last modified 2018-06-07


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