학술논문
Performance of the final Event Builder for the ATLAS Experiment
Document Type
Conference
Author
Beck, Hans Peter; Abolins, Maris; Battaglia, Andreas; Blair, Robert; Bogaerts, Andre; Bosman, Martine; Ciobotaru, Matei; Cranfield, Robert; Crone, Gordon; Dawson, John; Dobinson, Robert; Dobson, Marc; Dos Anjos, Andre; Drake, Gary; Ermoline, Yuri; Ferrari, Roberto; Ferrer, Maria Lorenza; Francis, David; Gadomski, Szymon; Gameiro, Sonia; Gorini, Benedetto; Green, Barry; Haberichter, William; Haberli, Christian; Hauser, Reiner; Hinkelbein, Christian; Hughes-Jones, Richard; Joos, Markus; Kieft, Gerard; Klous, Sander; Korcyl, Krzystof; Kordas, Konstantinos; Kugel, Andreas; Leahu, Lucian; Lehmann, Giovanna; Martin, Brian; Mapelli, Livio; Meessen, Christophe; Meirosu, Catalin; Misiejuk, Andrzej; Mornacchi, Giuseppe; Muller, Matthias; Nagasaka, Yasushi; Negri, Andrea; Pasqualucci, Enrico; Pauly, Thilo; Petersen, Jorgen; Pope, Bernard; Schlereth, James; Spiwoks, Ralf; Stancu, Stefan; Strong, John; Sushkov, Sergey; Szymocha, Tadeusz; Tremblet, Louis; Unel, Gokhan; Vandelli, Wainer; Vermeulen, Joseph; Werner, Per; Wheeler-Ellis, Sarah; Wickens, Fred; Wiedenmann, Werner; Yu, Maoyuan; Yasu, Yasushi; Zhang, Jinlong; Zobernig, Haimo
Source
2007 15th IEEE-NPSS Real-Time Conference Real-Time Conference, 2007 15th IEEE-NPSS. :1-6 Apr, 2007
Subject
Language
Abstract
Event data from proton-proton collisions at the LHC will be selected by the ATLAS experiment in a three level trigger system, which reduces the initial bunch crossing rate of 40 MHz at its first two trigger levels (LVL1+LVL2) to 3 kHz. At this rate the Event-Builder collects the data from all Read-Out system PCs (ROSs) and provides fully assembled events to the the Event-Filter (EF), which is the third level trigger, to achieve a further rate reduction to 200 Hz for permanent storage. The Event-Builder is based on a farm of O(100) PCs, interconnected via Gigabit Ethernet to O(150) ROSs. These PCs run Linux and multi-threaded software applications implemented in C++. All the ROSs and one third of the Event-Builder PCs are already installed and commissioned. We report on performance tests on this initial system, which show promising results to reach the final data throughput required for the ATLAS experiment.