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The ATLAS Level-1 Calorimeter Trigger: PreProcessor implementation and performance
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
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2012 (English)In: Journal of Instrumentation, ISSN 1748-0221, Vol. 7, P12008- p.Article in journal (Refereed) Published
Abstract [en]

The PreProcessor system of the ATLAS Level-1 Calorimeter Trigger (L1Calo) receives about 7200 analogue signals from the electromagnetic and hadronic components of the calorimetric detector system. Lateral division results in cells which are pre-summed to so-called Trigger Towers of size 0.1 x 0.1 along azimuth (phi) and pseudorapidity (eta). The received calorimeter signals represent deposits of transverse energy. The system consists of 124 individual PreProcessor modules that digitise the input signals for each LHC collision, and provide energy and timing information to the digital processors of the L1Calo system, which identify physics objects forming much of the basis for the full ATLAS first level trigger decision. This paper describes the architecture of the PreProcessor, its hardware realisation, functionality, and performance.

Place, publisher, year, edition, pages
2012. Vol. 7, P12008- p.
Keyword [en]
Trigger concepts and systems (hardware and software), Trigger algorithms, Modular electronics, Front-end electronics for detector readout
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-87807DOI: 10.1088/1748-0221/7/12/P12008ISI: 000312962500039OAI: diva2:606458
Swedish Research CouncilKnut and Alice Wallenberg Foundation


Available from: 2013-02-19 Created: 2013-02-19 Last updated: 2013-02-19Bibliographically approved

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Åsman, BarbroBendtz, KatarinaBohm, ChristianHellman, StenMoa, TorbjörnOhm, Christian C.Plucinski, PawelSilverstein, Samuel B.
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Department of Physics
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