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The LHCb Online system in 2020: trigger-free read-out with (almost exclusively) off-the-shelf hardware
/ Colombo, T (CERN) ; Amihalachioaei, A (CERN ; Gh. Asachi Tech. U., Iasi) ; Arnaud, K (Marseille, CPPM) ; Alessio, F (CERN) ; Brarda, L (CERN) ; Cachemiche, J P (Marseille, CPPM) ; Cámpora, D (CERN ; Seville U.) ; Cap, S (Annecy, LAPP) ; Cardoso, L (CERN) ; Cindolo, F (INFN, Bologna ; U. Bologna, DIFA) et al.
The LHCb experiment at CERN has decided to optimise its physics reach by removing the first level hardware trigger for 2020 and beyond. In addition to requiring fully redesigned front-end electronics this design creates interesting challenges for the data-acquisition and the rest of the online computing system. [...]
2018 - 7 p.
- Published in : J. Phys.: Conf. Ser. 1085 (2018) 032041
Fulltext: PDF;
In : 18th International Workshop on Advanced Computing and Analysis Techniques in Physics Research, Seattle, WA, USA, 21 - 25 Aug 2017, pp.032041
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MiniDAQ1: A Compact Data Acquisition System for GBT Readout over 10G Ethernet at LHCb
/ Durante, Paolo (CERN) ; Cachemiche, Jean-Pierre (Marseille, CPPM) ; Vouters, Guillaume (Annecy, LAPP) ; Alessio, Federico (CERN) ; Granado Cardoso, Luis (CERN) ; Viana Barbosa, Joao Vitor (CERN) ; Neufeld, Niko (CERN)
The LHCb experiment at CERN is undergoing a significant upgrade in anticipation of the increased luminosity that will be delivered by the LHC during Run 3 (starting in 2021). In order to allow efficient event selection in the new operating regime, the upgraded LHCb experiment will have to operate in continuous readout mode and deliver all 40 MHz of particle collisions directly to the software trigger. [...]
2018 - 5 p.
- Published in : Springer Proc. Phys. 212 (2018) 332-336
In : International Conference on Technology and Instrumentation in Particle Physics 2017, Beijing, China, 21 - 26 May 2017, pp.332-336
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The PCIe-based readout system for the LHCb experiment
/ Cachemiche, J P (Marseille, CPPM) ; Duval, P Y (Marseille, CPPM) ; Hachon, F (Marseille, CPPM) ; Le Gac, R (Marseille, CPPM) ; Réthoré, F (Marseille, CPPM)
The LHCb experiment is designed to study differences between particles and anti-particles as well as very rare decays in the beauty and charm sector at the LHC. The detector will be upgraded in 2019 in order to significantly increase its efficiency, by removing the first-level hardware trigger. [...]
2016 - 12 p.
- Published in : JINST 11 (2016) P02013
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GBT link testing and performance measurement on PCIe40 and AMC40 custom design FPGA boards
/ Mitra, Jubin (Calcutta, VECC) ; Khan, Shuaib A (Calcutta, VECC) ; Marin, Manoel Barros (CERN) ; Cachemiche, Jean-Pierre (Marseille, CPPM) ; David, Erno (Wigner RCP, Budapest) ; Hachon, Fr (Marseille, CPPM) ; Rethore, Fr (Marseille, CPPM) ; Kiss, Tivadar (Wigner RCP, Budapest) ; Baron, Sophie (CERN) ; Kluge, Alex (CERN) et al.
The high-energy physics experiments at the CERN's Large Hadron Collider (LHC) are preparing for Run3, which is foreseen to start in the year 2021. Data from the high radiation environment of the detector front-end electronics are transported to the data processing units, located in low radiation zones through GBT (Gigabit transceiver) links. [...]
2016 - 12 p.
- Published in : JINST 11 (2016) C03039
IOP Open Access article: PDF;
In : Topical Workshop on Electronics for Particle Physics, Lisbon, Portugal, 28 Sep - 2 Oct 2015, pp.C03039
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Evaluation of 400 m, 4.8 Gbit/s Versatile Link lengths over OM3 and OM4 fibres for the LHCb upgrade
/ Schwemmer, R (CERN) ; Cachemiche, J P (Marseille, CPPM) ; Neufeld, N (CERN) ; Soos, C (CERN) ; Troska, J (CERN) ; Wyllie, K (CERN)
2014
- Published in : JINST 9 (2014) C03030
IOP Open Access article: PDF;
In : Topical Workshop on Electronics for Particle Physics, Perugia, Italy, 23 - 27 Sep 2013, pp.C03030
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Review Document: Low Level Trigger (LLT)
/ Akar, S (CPPM, Marseille, France) ; Cachemiche, J-P (CPPM, Marseille, France) ; Chanal, H (LPC, Clermont Ferrand, France) ; Cogan, J (CPPM, Marseille, France) ; Drancourt, C (LAPP, Annecy, France) ; Lefèvre, R (LPC, Clermont Ferrand, France) ; Le Gac, R (CPPM, Marseille, France) ; Neufeld, N (CERN) ; Robbe, P (CERN) ; Vesterinen, M (Physikalisches Institut, Ruprecht-Karls-Universitat Heidelberg, Heidelberg, Germany)
This document presents the possible implementations of a Low Level Trigger (LLT) for the upgrade of the LHCb detector. Two scenarios are under study: a hardware LLT similar to the currently existing L0 trigger and a software trigger using CPU of the event builder computers. [...]
LHCb-PUB-2014-037; CERN-LHCb-PUB-2014-037.-
Geneva : CERN, 2014 - 16 p.
Fulltext: PDF;
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LHCb: Evaluation of 400m, 5Gbit Versatile Link lengths over OM3 and OM4 fibres for the LHCb upgrade
Reference: Poster-2013-336
Keywords: LHCb computing online upgrade
Created: 2013. -1 p
Creator(s): Schwemmer, R; Cachemiche, J-P; Neufeld, N; Soos, C; Troska, J [...]
The LHCb experiment will upgrade its DAQ system to a trigger less, 40MHz read-out after LS2. To be able to process the approximately 40Tbit/s of data we will require a massive computing farm. This computing farm can not be installed underground, in the vicinity of the detector anymore due to the enormous power and cooling requirements. An affordable data transport solution has to be found to carry the data from the detector to the new data center on the surface. The distance to cover is estimated to be between 300 and 400 meters. We evaluated the feasibility of using the 5Gbit/s Versatile Link to cover the full distance over OM3 and OM4 quality fibres and will present our results.
Related links:
Conference: TWEPP 2013 - Topical Workshop on Electronics for Particle Physics
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