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Title: The CMS Data Acquisition - Architectures for the Phase-2 Upgrade

Abstract

The upgraded High Luminosity LHC, after the third Long Shutdown (LS3), will provide an instantaneous luminosity of 7.5 × 10 34 cm -2 s -1 (levelled), at the price of extreme pileup of up to 200 interactions per crossing. In LS3, the CMS Detector will also undergo a major upgrade to prepare for the phase-2 of the LHC physics program, starting around 2025. The upgraded detector will be read out at an unprecedented data rate of up to 50 Tb/s and an event rate of 750 kHz. Complete events will be analysed by software algorithms running on standard processing nodes, and selected events will be stored permanently at a rate of up to 10 kHz for offline processing and analysis. Here in this paper we discuss the baseline design of the DAQ and HLT systems for the phase-2, taking into account the projected evolution of high speed network fabrics for event building and distribution, and the anticipated performance of general purpose CPU. Implications on hardware and infrastructure requirements for the DAQ “data center” are analysed. Emerging technologies for data reduction are considered. Novel possible approaches to event building and online processing, inspired by trending developments in other areas of computingmore » dealing with large masses of data, are also examined. We conclude by discussing the opportunities offered by reading out and processing parts of the detector, wherever the front-end electronics allows, at the machine clock rate (40 MHz). This idea presents interesting challenges and its physics potential should be studied.« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [3];  [1];  [4];  [5];  [4];  [5];  [4];  [1];  [6];  [4];  [4];  [4];  [4];  [5];  [4] more »;  [3];  [7];  [4];  [4];  [4];  [4];  [1];  [4];  [1];  [4];  [5];  [4];  [3];  [4];  [4];  [4];  [4];  [7];  [8] « less
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. Univ. of California, San Diego, CA (United States)
  4. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. Univ. of California, Los Angeles, CA (United States)
  7. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Vilnius Univ. (Lithuania)
  8. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1421539
Report Number(s):
CMS-CR-2017-030; FERMILAB-CONF-16-767-CMS
Journal ID: ISSN 1742-6588; 1638129; TRN: US1801525
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 898; Journal Issue: 3; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Andre, J-M, Behrens, U., Branson, J., Brummer, P., Chaze, O., Cittolin, S., Contescu, C., Craigs, B. G., Darlea, G-L, Deldicque, C., Demiragli, Z., Dobson, M., Doualot, N., Erhan, S., Fulcher, J. F., Gigi, D., Gładki, M., Glege, F., Gomez-Ceballos, G., Hegeman, J., Holzner, A., Janulis, M., Jimenez-Estupiñán, R., Masetti, L., Meijers, F., Meschi, E., Mommsen, R. K., Morovic, S., O’Dell, V., Orsini, L., Paus, C., Petrova, P., Pieri, M., Racz, A., Reis, T., Sakulin, H., Schwick, C., Simelevicius, D., and Zejdl, P. The CMS Data Acquisition - Architectures for the Phase-2 Upgrade. United States: N. p., 2017. Web. doi:10.1088/1742-6596/898/3/032019.
Andre, J-M, Behrens, U., Branson, J., Brummer, P., Chaze, O., Cittolin, S., Contescu, C., Craigs, B. G., Darlea, G-L, Deldicque, C., Demiragli, Z., Dobson, M., Doualot, N., Erhan, S., Fulcher, J. F., Gigi, D., Gładki, M., Glege, F., Gomez-Ceballos, G., Hegeman, J., Holzner, A., Janulis, M., Jimenez-Estupiñán, R., Masetti, L., Meijers, F., Meschi, E., Mommsen, R. K., Morovic, S., O’Dell, V., Orsini, L., Paus, C., Petrova, P., Pieri, M., Racz, A., Reis, T., Sakulin, H., Schwick, C., Simelevicius, D., & Zejdl, P. The CMS Data Acquisition - Architectures for the Phase-2 Upgrade. United States. doi:10.1088/1742-6596/898/3/032019.
Andre, J-M, Behrens, U., Branson, J., Brummer, P., Chaze, O., Cittolin, S., Contescu, C., Craigs, B. G., Darlea, G-L, Deldicque, C., Demiragli, Z., Dobson, M., Doualot, N., Erhan, S., Fulcher, J. F., Gigi, D., Gładki, M., Glege, F., Gomez-Ceballos, G., Hegeman, J., Holzner, A., Janulis, M., Jimenez-Estupiñán, R., Masetti, L., Meijers, F., Meschi, E., Mommsen, R. K., Morovic, S., O’Dell, V., Orsini, L., Paus, C., Petrova, P., Pieri, M., Racz, A., Reis, T., Sakulin, H., Schwick, C., Simelevicius, D., and Zejdl, P. Sun . "The CMS Data Acquisition - Architectures for the Phase-2 Upgrade". United States. doi:10.1088/1742-6596/898/3/032019. https://www.osti.gov/servlets/purl/1421539.
@article{osti_1421539,
title = {The CMS Data Acquisition - Architectures for the Phase-2 Upgrade},
author = {Andre, J-M and Behrens, U. and Branson, J. and Brummer, P. and Chaze, O. and Cittolin, S. and Contescu, C. and Craigs, B. G. and Darlea, G-L and Deldicque, C. and Demiragli, Z. and Dobson, M. and Doualot, N. and Erhan, S. and Fulcher, J. F. and Gigi, D. and Gładki, M. and Glege, F. and Gomez-Ceballos, G. and Hegeman, J. and Holzner, A. and Janulis, M. and Jimenez-Estupiñán, R. and Masetti, L. and Meijers, F. and Meschi, E. and Mommsen, R. K. and Morovic, S. and O’Dell, V. and Orsini, L. and Paus, C. and Petrova, P. and Pieri, M. and Racz, A. and Reis, T. and Sakulin, H. and Schwick, C. and Simelevicius, D. and Zejdl, P.},
abstractNote = {The upgraded High Luminosity LHC, after the third Long Shutdown (LS3), will provide an instantaneous luminosity of 7.5 × 1034 cm-2 s-1 (levelled), at the price of extreme pileup of up to 200 interactions per crossing. In LS3, the CMS Detector will also undergo a major upgrade to prepare for the phase-2 of the LHC physics program, starting around 2025. The upgraded detector will be read out at an unprecedented data rate of up to 50 Tb/s and an event rate of 750 kHz. Complete events will be analysed by software algorithms running on standard processing nodes, and selected events will be stored permanently at a rate of up to 10 kHz for offline processing and analysis. Here in this paper we discuss the baseline design of the DAQ and HLT systems for the phase-2, taking into account the projected evolution of high speed network fabrics for event building and distribution, and the anticipated performance of general purpose CPU. Implications on hardware and infrastructure requirements for the DAQ “data center” are analysed. Emerging technologies for data reduction are considered. Novel possible approaches to event building and online processing, inspired by trending developments in other areas of computing dealing with large masses of data, are also examined. We conclude by discussing the opportunities offered by reading out and processing parts of the detector, wherever the front-end electronics allows, at the machine clock rate (40 MHz). This idea presents interesting challenges and its physics potential should be studied.},
doi = {10.1088/1742-6596/898/3/032019},
journal = {Journal of Physics. Conference Series},
number = 3,
volume = 898,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}

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