A Hybrid Approach for the ATLAS Level-2 Trigger

Kugel, Andreas ; Lay, Ralf ; Ludvig, Jozsef ; Männer, Reinhard ; Noffz, Klaus-Henning ; Rühl, Stephan ; Sessler, Matthias ; Simmler, Harald ; Singpiel, Holger

URL: http://cds.cern.ch/record/685801/files/daq-97-078....
Document Type: Conference or workshop publication
Year of publication: 1997
Book title: Electronics for LHC experiments : Proceedings, 3rd Workshop, London, UK, September 22-26, 1997
The title of a journal, publication series: Proc. 3rd Workshop on Electronics for LHC Experim.
Page range: 343-347
Place of publication: Genève
Publishing house: CERN
Publication language: English
Institution: School of Business Informatics and Mathematics > Informatik V (Männer 1992-2008)
Subject: 004 Computer science, internet
Abstract: There are several different concepts for the ATLAS Level-2 trigger under investigation, all of which have to cope with the following challenges The high luminosity trigger has to cope with an event frequency of 100 kHz. One result of the Level-2 demonstrator program was that such an event frequency is a serious problem for present farm solutions. For the low luminosity trigger the critical item is the processing of the complete data volume of the Transition-Radiation-Tracker (TRT). This leads to an enormous demand in terms of computing power and bandwidth. These above problems could be resolved by a hybrid trigger combining an FPGA-processor and a processor-farm. The inserted FPGA-processor layer executes simple reconstruction algorithms and applies loose physics selection criteria. These criteria already reject 80% of the events with a high - pt trigger and reduce the bandwith by a factor of 6 in regard to the full scan TRT. This would scale down the farm and strongly reduce the networking requirements. The FPGA-processor layer and the farm together build a cost e ective hybrid solution for the level-2 trigger.

Dieser Eintrag ist Teil der Universitätsbibliographie.

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