The ATLAS Event Builder
- Vandelli, W
- Abolins, M
- Battaglia, A
- Beck, H P
- Blair, R
- Bogaerts, A
- Bosman, M
- Ciobotaru, M
- Cranfield, R
- Crone, G
- Dawson, J
- Dobinson, Robert W
- 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
- Müller, M
- Nagasaka, Y
- Negri, A
- Pasqualucci, E
- Pauly, T
- Petersen, J
- Pope, B
- Schlereth, J L
- Spiwoks, R
- Stancu, S
- Strong, J
- Sushkov, S
- Szymocha, T
- Tremblet, L
- Ünel, G
- Vermeulen, J
- Werner, P
- Wheeler-Ellis, S
- Wickens, F
- Wiedenmann, W
- Yu, M
- Yasu, Y
- Zhang, J
- Zobernig, H
DOIAbstract
Event data from proton-proton collisions at the LHC will be selected by the ATLAS experiment in a three-level trigger system, which, at its first two trigger levels (LVL1+LVL2), reduces the initial bunch crossing rate of 40~MHz to $sim$3~kHz. At this rate, the Event Builder collects the data from the readout system PCs (ROSs) and provides fully assembled events to the Event Filter (EF). The EF is the third trigger level and its aim is to achieve a further rate reduction to $sim$200~Hz on the permanent storage. The Event Builder is based on a farm of O(100) PCs, interconnected via a Gigabit Ethernet to O(150) ROSs. These PCs run Linux and multi-threaded software applications implemented in C++. All the ROSs, and substantial fractions of the ...
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