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The LHC b DAQ and Trigger Systems: recent updates

The LHC b DAQ and Trigger Systems: recent updates. Ricardo Graciani XXXIV International Meeting on Fundamental Physics. Overview. LHC b The Original Design Trigger Rate: From 200 Hz to 2000 Hz Level 1 suppression: 1 MHz Readout Outlook. LHC b. pp interactions/crossing. Production

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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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