A new event builder for CMS Run II

Journal Article · Wed Dec 23 04:00:00 UTC 2015 · Journal of Physics. Conference Series

DOI: https://doi.org/10.1088/1742-6596/664/8/082035 · OSTI ID:1250527

Albertsson, K. ^[1]; Andre, J-M ^[2]; Andronidis, A. ^[1]; Behrens, U. ^[3]; Branson, J. ^[4]; Chaze, O. ^[1]; Cittolin, S. ^[4]; Darlea, G-L ^[5]; Deldicque, C. ^[1]; Dobson, M. ^[1]; Dupont, A. ^[1]; Erhan, S. ^[6]; Gigi, D. ^[1]; Glege, F. ^[1]; Gomez-Ceballos, G. ^[5]; Hegeman, J. ^[1]; Holzner, A. ^[4]; Jimenez-Estupiñán, R. ^[1]; Masetti, L. ^[1]; Meijers, F. ^[1] ; Meschi, E. ^[1]; Mommsen, R. K. ^[2]; Morovic, S. ^[1]; Nunez-Barranco-Fernandez, C. ^[1]; O'Dell, V. ^[2]; Orsini, L. ^[1]; Paus, C. ^[5]; Petrucci, A. ^[1]; Pieri, M. ^[4]; Racz, A. ^[1]; Roberts, P. ^[1]; Sakulin, H. ^[1]; Schwick, C. ^[1]; Stieger, B. ^[1]; Sumorok, K. ^[5]; Veverka, J. ^[5]; Zaza, S. ^[1]; Zejdl, P. ^[1]

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1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
2. Fermi National Accelerator Lab. (FNAL), Chicago, IL (United States)
3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
4. Univ. of California, San Diego, CA (United States)
5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
6. Univ. of California, Los Angeles, CA (United States)

The data acquisition system (DAQ) of the CMS experiment at the CERN Large Hadron Collider (LHC) assembles events at a rate of 100 kHz, transporting event data at an aggregate throughput of 100 GB/s to the high-level trigger (HLT) farm. The DAQ system has been redesigned during the LHC shutdown in 2013/14. The new DAQ architecture is based on state-of-the-art network technologies for the event building. For the data concentration, 10/40 Gbps Ethernet technologies are used together with a reduced TCP/IP protocol implemented in FPGA for a reliable transport between custom electronics and commercial computing hardware. A 56 Gbps Inniband FDR CLOS network has been chosen for the event builder. This paper discusses the software design, protocols, and optimizations for exploiting the hardware capabilities. In conclusion, ee present performance measurements from small-scale prototypes and from the full-scale production system.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1250527
• Report Number(s): FERMILAB-CONF--15-206-E; 1408132
• Journal Information: Journal of Physics. Conference Series, Journal Name: Journal of Physics. Conference Series Journal Issue: 8 Vol. 664; ISSN 1742-6588
• Publisher: IOP PublishingCopyright Statement
• Country of Publication: United States
• Language: English