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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

The LHCb DAQ and Trigger Systems: recent updates

Ricardo Graciani

XXXIV International Meeting on Fundamental Physics.

overview
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

lhc b
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

the spectrometer
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

lhc b physics program
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

the lhc b tp
The LHCb TP

HLT

The LHCb DAQ and Trigger Systems: recent updates

from 200 to 2000 hz
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

2 khz trigger output
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

cost estimate
Cost Estimate

The LHCb DAQ and Trigger Systems: recent updates

daq architecture
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

the old system
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

1 mhz daq
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

advantages
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

the hardware candidate
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

reviewed hlt strategy
Reviewed HLT Strategy

The LHCb DAQ and Trigger Systems: recent updates

outlook
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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