1. The Terabit/s Super-Fragment Builder and Trigger Throttling System for the Compact Muon Solenoid Experiment at CERN.
- Author
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Bauer, Gerry, Boyer, Vincent, Branson, James, Brett, Angela, Cano, Eric, Carboni, Andrea, Ciganek, Marek, Cittolin, Sergio, Erhan, Samim, Gigi, Dominique, Glege, Frank, Gomez-Reino, Robert, Gulmini, Michele, Mlot, Esteban Gutierrez, Gutleber, Johannes, Jacobs, Claude, Jin Cheol Kim, Klute, Markus, Lipeles, Elliot, and Perez, Juan Antonio Lopez
- Subjects
ACQUISITION of databases ,ELECTRONIC feedback ,INTEGRATED circuit interconnections ,COMPUTER networks ,TRIGGER circuits ,MUONS ,SOLENOIDS ,LARGE Hadron Collider - 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 kB 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. Back-pres- sure from the down-stream event-processing or variations in the size and rate of events may give rise to buffer overflows in the subdetector's front-end electronics, which would result in data corruption and would require a time-consuming re-sync procedure to recover. The Trigger-Throttling System protects against these buffer overflows. It provides fast feedback from any of the subdetector front-ends to the trigger so that the trigger can be throttled be- fore buffers overflow. 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 subdetectors. The ongoing commissioning of the full-scale system is discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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