The ATLAS ReadOut System—Performance with first data and perspective for the future

Authors
  • G. Crone
  • D. Della Volpe
  • B. Gorini
  • B. Green
  • M. Joos
  • G. Kieft
  • K. Kordas
  • A. Kugel
  • A. Misiejuk
  • N. Schroer
  • P. Teixeira-Dias
  • L. Tremblet
  • J. Vermeulen
  • F. Wickens
  • P. Werner
Publication date 2010
Journal Nuclear Instruments & Methods in Physics Research Section A - Accelerators Spectrometers Detectors and Associated Equipment
Volume | Issue number 623 | 1
Pages (from-to) 534-536
Organisations
  • Faculty of Science (FNWI) - Institute of Physics (IoP) - Institute for High Energy Physics (IHEF)
Abstract
The ATLAS ReadOut System (ROS) receives data fragments from ~ 1600 detector readout links, buffers them and provides them on demand to the second-level trigger or to the event building system. The ROS is implemented with ~ 150 PCs. Each PC houses a few, typically 4, custom-built PCI boards (ROBIN) and a 4-port PCIe Gigabit Ethernet NIC. The PCs run a multi-threaded object-oriented application managing the requests for data retrieval and for data deletion coming through the NIC, and the collection and output of data from the ROBINs. At a nominal event fragment arrival rate of 75 kHz the ROS has to concurrently service up to approximately 20 kHz of data requests from the second-level trigger and up to 3.5 kHz of requests from event building nodes. The full system has been commissioned in 2007. Performance of the system in terms of stability and reliability, results of laboratory rate capability measurements and upgrade scenarios are discussed in this paper.
Document type Article
Language English
Published at https://doi.org/10.1016/j.nima.2010.03.061
Permalink to this page
Back