학술논문
Performance of the Final Event Builder for the ATLAS Experiment
Document Type
Periodical
Author
Beck, H. P.; Abolins, M.; Battaglia, A.; Blair, R.; Bogaerts, A.; Bosman, M.; Ciobotaru, M.; Cranfield, R.; Crone, G.; Dawson, J.; Dobinson, R.; Dobson, M.; Dos Anjos, A.; Drake, G.; Ermoline, Y.; Ferrari, R.; Ferrer, M. L.; Francis, D.; Gadomski, S.; Gameiro, S.; Gorini, B.; Green, B.; Haberichter, W.; Haberli, C.; Hauser, R.; Hinkelbein, C.; Hughes-Jones, R.; Joos, M.; Kieft, G.; Klous, S.; Korcyl, K.; Kordas, K.; Kugel, A.; Leahu, L.; Lehmann, G.; Martin, B.; Mapelli, L.; Meessen, C.; Meirosu, C.; Misiejuk, A.; Mornacchi, G.; Muller, M.; Nagasaka, Y.; Negri, A.; Pasqualucci, E.; Pauly, T.; Petersen, J.; Pope, B.; Schlereth, J.; Spiwoks, R.; Stancu, S.; Strong, J.; Sushkov, S.; Szymocha, T.; Tremblet, L.; Unel, G.; Vandelli, W.; Vermeulen, J.; Werner, P.; Wheeler-Ellis, S.; Wickens, F.; Wiedenmann, W.; Yu, M.; Yasu, Y.; Zhang, J.; Zobernig, H.
Source
IEEE Transactions on Nuclear Science IEEE Trans. Nucl. Sci. Nuclear Science, IEEE Transactions on. 55(1):176-181 Feb, 2008
Subject
Language
ISSN
0018-9499
1558-1578
1558-1578
Abstract
Event data from proton-proton collisions at the LHC will be selected by the ATLAS experiment by a three level trigger system, which reduces the initial bunch crossing rate of 40 MHz at its first two trigger levels (LVL1+LVL2) to $\sim$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 $\sim$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. Performance measurements have been exercised on this initial system, which show promising results that the required final data rates and bandwidth for the ATLAS event builder are in reach.