Journal Article

PUBDB-2016-00239

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The New CMS DAQ System for Run-2 of the LHC

Bawej, T. ; Behrens, U. (Corresponding author)DESY* ; Branson, J. ; Chaze, O. ; Cittolin, S. ; Darlea, G.-L. ; Deldicque, C. ; Dobson, M. ; Dupont, A. ; Erhan, S. ; Forrest, A. ; Gigi, D. ; Glege, F. ; Gomez-Ceballos, G. ; Gomez-Reino, R. ; Hegeman, J. ; Holzner, A. ; Masetti, L. ; Meijers, F. ; Meschi, E. ; Mommsen, R. K. ; Morovic, S. ; Nunez-Barranco-Fernandez, C. ; O'Dell, V. ; Orsini, L. ; Paus, C. ; Petrucci, A. ; Pieri, M. ; Racz, A. ; Sakulin, H. ; Schwick, C. ; Stieger, B. ; Sumorok, K. ; Veverka, J. ; Zejdl, P.

2015
IEEE New York, NY

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Please use a persistent id in citations: doi:10.1109/TNS.2015.2426216

Abstract: Abstract—The data acquisition (DAQ) system of the CMS experiment at the CERN Large Hadron Collider 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 HLT farm selects interesting events for storage and offline analysis at a rate of around 1 kHz. The DAQ system has been redesigned during the accelerator shutdown in 2013/14. The motivation is twofold: Firstly, the current compute nodes, networking, and storage infrastructure will have reached the end of their lifetime by the time the LHC restarts. Secondly, in order to handle higherLHC luminosities and event pileup, a number of sub-detectors will be upgraded, increasing the number of readout channelsand replacing the off-detector readout electronics with a TCA implementation. The new DAQ architecture will take advantageof the latest developments in the computing industry. For data concentration, 10/40 Gb/s Ethernet technologies will be used, aswell as an implementation of a reduced TCP/IP in FPGA for a reliable transport between custom electronics and commercialcomputing hardware. A Clos network based on 56 Gb/s FDR Infiniband has been chosen for the event builder with a throughputof Tb/s. The HLT processing is entirely file based. This allows the DAQ and HLT systems to be independent, and to use the HLTsoftware in the same way as for the offline processing. The fully built events are sent to the HLT with 1/10/40 Gb/s Ethernet vianetwork file systems. Hierarchical collection of HLT accepted events and monitoring meta-data are stored into a global filesystem. This paper presents the requirements, technical choices, and performance of the new system. Index Terms—Data acquisition, high energy physics.

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. 632 - Detector technology and systems (POF3-632) (POF3-632)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2015

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Database coverage:
; ; ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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