The lhc b daq and trigger systems recent updates
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

The LHC b DAQ and Trigger Systems: recent updates PowerPoint PPT Presentation


  • 70 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

The LHC b DAQ and Trigger Systems: recent updates

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


  • Login