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The LHC b DAQ and Trigger Systems: recent updates

This overview presents the latest advancements in the LHCb Data Acquisition (DAQ) and Trigger systems, as discussed at the XXXIV International Meeting on Fundamental Physics. Key highlights include the evolution of trigger rates from 200 Hz to 2000 Hz, enhancements in Level 1 suppression, and an update on the DAQ architecture to improve efficiency and lower dependencies on Monte Carlo samples. It further details the physics program goals, including B meson decays, flavour oscillations, and rare decay processes, emphasizing the importance of these updates for future LHCb experiments.

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The LHC b DAQ and Trigger Systems: recent updates

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  1. The LHCb DAQ and Trigger Systems: recent updates Ricardo Graciani XXXIV International Meeting on Fundamental Physics.

  2. Overview • LHCb • The Original Design • Trigger Rate: • From 200 Hz to 2000 Hz • Level 1 suppression: • 1 MHz Readout • Outlook The LHCb DAQ and Trigger Systems: recent updates

  3. LHCb pp interactions/crossing Production angle Of B vs B  B (rad)  B (rad) • LHC: • 40 MHz crossing rate • 30 MHz with bunches from both directions • Luminosity: 2·1032 cm-2 s-1 • 10 to 50 times lower than @ ATLAS, CMS • One Arm Forward Spectrometer • LHCb rates: (for visible events  at least 2 tracks in acceptance) • Total rate (minimum bias): 10 MHz • bb: ~100kHz • Whole decay of one B in acceptance: 15kHz • cc: ~600kHz The LHCb DAQ and Trigger Systems: recent updates

  4. The Spectrometer Dipole magnet Tracking system Muon system 250 mrad Calorimeters Vertex Locator 10 mrad p p RICH detectors The LHCb DAQ and Trigger Systems: recent updates

  5. LHCb Physics Program • Bs oscillation frequency, phase and ΔΓs • BsDs, J/ΨΦ, J/Ψη, ηcΦ •  from Bd0–+ •  with BdJ/KS as a proof of principle • And  from bs penguin • in various channels, differing sensitivity to new physics: • Time-dependent CP asymmetry of BsDs-K+ and Ds+K- • Time dependent CP asymmetries of Bdp+p- and Bs K+K- • Comparison of decay rates in the BdD0(K+π-,K-π+,K+K-)K*0 system • Comparison of decay rates in the B-D0(K+π-,K+π-π+π-)K- system • Dalitz analysis of B-  D0(KSπ-π+)K-and Bd D0(KSπ-π+)K*0 • Rare decays • Radiative penguin Bd K* g, BsΦ g, Bd g • Electroweak penguin Bd K*0m+m- • Gluonic penguin BsΦΦ, BdΦKs • Rare box diagram Bs m+m- • Bc , b-baryon physics + unexpected ! The LHCb DAQ and Trigger Systems: recent updates

  6. The LHCb TP HLT The LHCb DAQ and Trigger Systems: recent updates

  7. From 200 to 2000 Hz • Initial Design: • 200 Hz of partial or fully reconstructed B final States. • Exclusive B Trigger. • Limitations: • Strong MC dependence: • Efficiency determination • Detector Performance (vertex, proper time, PID) • Backgrounds • Huge MC samples are necessary. • Conclusion: • Review strategy • Use real Data for the above studies • Re-evaluation of Computing needs • Factor 10 reduction on MC needs • Factor 10 increase on Trigger rate The LHCb DAQ and Trigger Systems: recent updates

  8. 2 kHz Trigger Output • Best guess at present (split between streams still to be determined) • Exclusive reconstruction is kept • Large inclusive streams to be used to control calibration and systematics (trigger, tracking, PID, tagging,…) • 10-15% acceptance for any channel on inclusive samples. The LHCb DAQ and Trigger Systems: recent updates

  9. Cost Estimate The LHCb DAQ and Trigger Systems: recent updates

  10. DAQ Architecture Front-end Electronics Level-1Traffic HLTTraffic FE FE FE FE FE FE FE FE FE FE TRM FE FE 40 kHz 1.6 GB/s 1000 kHz 5.5 GB/s Switch Switch Switch Switch Switch Multiplexing Layer TIER0 ECS Readout Network L1-Decision Sorter TFCSystem SFC SFC SFC SFC SFC Switch Switch Switch Switch Switch StorageSystem 7.1 GB/s ~ 250 MB/s total 94 SFCs Scalable in depth:more CPUs (<2200) Scalable in width: more detectors in Level-1 CPUFarm CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU ~1600 CPUs The LHCb DAQ and Trigger Systems: recent updates

  11. The “old” System • Detector L0 boards: • talk Gb Ethernet • implement buffer to allow for Level 1 latency • Two Data Streams: • Level-1 trigger with latency limit of ~58 ms @1 MHz • 3.8 kB/event  ~4.3 GB/sec • HLT traffic without latency limitations @ 40 kHz • ~30 kB/event  ~1.2 GB/s The LHCb DAQ and Trigger Systems: recent updates

  12. 1 MHz DAQ Front-end Electronics TFCSystem FE FE FE FE FE FE ECS Readout Network StorageSystem CPUFarm Switch Switch Switch Switch 50 SubFarms ~1800 CPUs CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU The LHCb DAQ and Trigger Systems: recent updates

  13. Advantages • Major simplification of the DAQ system • Only one data flow through the system • Elimination of the SFCs; • Event-Building in each CPU node • Elimination of the Level-1 decision sorter • No latency limitations for event processing • Well suited for multi-core CPU architectures • For the Trigger software • ALL information available at all times in full precision and full granularity • Better trigger efficiency • Required Switching power: ~ 60 GB/s The LHCb DAQ and Trigger Systems: recent updates

  14. The Hardware Candidate Force10 equipment • Port densities • Biggest switch has 14 slots for line-cards • Biggest port density is 90 Gb Ethernet ports per line-card (90/48 over-committed) • 14*90 = 1260 GbEthernet ports • Switching Fabric • Switching capacity is raw ~ 1.6 Tb/sec,usable ~ 1.2 Tb/sec (150 GB/s) The LHCb DAQ and Trigger Systems: recent updates

  15. Reviewed HLT Strategy The LHCb DAQ and Trigger Systems: recent updates

  16. Outlook • LHCb had a very scalable and flexible DAQ schema. • LHCb Trigger includes inclusive samples • HLT rate from 200 to 2000 Hz. • High-mass di-muon • D* • Inclusive b • Full L0 rate (1 MHz) sent to Online Filter Farm for a full software High Level Trigger. • Review Vertical Trigger strategy for HLT. The LHCb DAQ and Trigger Systems: recent updates

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