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The LHCb Upgrade. Outline. Introduction to LHCb Advantages, challenges & limitations The LHCb trigger Introducing the LHCb upgrade Aims & time scale The upgraded trigger The upgrade LHCb detector Implications on the sub-systems Conclusion. LHCb – a brief introduction.

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Presentation Transcript
outline
Outline
  • Introduction to LHCb
    • Advantages, challenges & limitations
    • The LHCb trigger
  • Introducing the LHCb upgrade
    • Aims & time scale
    • The upgraded trigger
  • The upgrade LHCb detector
    • Implications on the sub-systems
  • Conclusion

L. Eklund, University of Glasgow

lhcb a brief introduction
LHCb – a brief introduction
  • Precision Flavour Physics at the LHC
    • CP violation and rare decays
  • Forward spectrometer geometry
    • Covers 2 % of the solid angle, but 27 % of the bb-pairs

Muon Spectrometer

Tracking System

Calorimeters

Vertex Detector

Particle

Identification

L. Eklund, University of Glasgow

challenging the standard model
Challenging the Standard Model
  • Looking for deviations
    • Probe ‘box’ or ‘loop’ processes
    • Precise SM predictions
  • Compare measurements that are (in)sensitive to BSM physics.
    • CKM angle γ in Bs->Ds K
    • CKM angle γ in Bd,s->ππ, KK
  • Sensitivity to mass scales far beyond direct searches
  • Precision measurement
    • Statistics!
    • Systematics!

L. Eklund, University of Glasgow

experimental edge and challenge
Experimental Edge and Challenge
  • LHCb has access to an unprecedented statistics
  • Challenging environment: hadron collider
    • Trigger & event selection

Cross sections and 2011 yields in the detector acceptance

PLB 694 (2010) 209-216

Charm cross-section @ 7 TeV: σacc = 1.2 mb

LHCb-CONF-2010-013

pairs produced in the LHCb acceptance

L. Eklund, University of Glasgow

current operational conditions
Current Operational Conditions
  • Currently: L = 4 x 1032 cm-2s-1 @ 50 ns bunch spacing & 8 TeV
    • Design value: L = 2 x 1032 cm-2s-1 @ 25 ns & 14 TeV
  • Interactions per bunch crossing: 1.5-2
    • Design value: 0.4
  • Luminosity Levelling: constant during the fill
    • LHCb is not limited by LHC

L. Eklund, University of Glasgow

goals and timeline
Goals and Timeline
  • Increase the annual signal yield compared to 2011
    • 10 times for muonic channels
    • 20 times for hadronic channels
  • Operate at instantaneous luminosity exceeding 1033 cm-2s-1
  • Collect 50 fb-1 of integrated luminosity

LHCb Upgrade installation

LHCb Upgrade design & construction

2010 – 2012

collect 2.5 fb-1

@ 7-8 TeV

2015-2017

collect > 5 fb-1

@ 13-14 TeV

2019-2022

collect > 5 fb-1/year

@ 13-14 TeV

LS2: Injector and LHC

Phase I GPD upgrades

LS1: splice repairs

L. Eklund, University of Glasgow

lhcb trigger scheme
LHCb Trigger Scheme
  • L0 H/W trigger
    • 4 μs latency in FE electronics
  • HLT S/W trigger
    • Implemented in CPU farm
  • Luminosity upgrade
    • Event yields saturate
    • Need full event information at L0

4.5 KHz

L. Eklund, University of Glasgow

upgraded trigger scheme
Upgraded Trigger Scheme

Optional

Low Level Trigger

throttle

1-40 MHz

40 MHz

HLT

Tracking and vertexing

Impact Parameter cuts

Inclusive/Exclusive selections

20 kHz

to tape

L. Eklund, University of Glasgow

challenge data rates
Challenge: Data Rates
  • Full detector read-out @ 40 MHz
    • Current Vertex Locator: 225 G samples/s (analogue)
    • Upgraded Vertex Locator: 2-3 Tbit/s (digital)
  • On-detector zero-suppression
    • Replace (almost) all FE electronics
  • Massive read-out infrastructure

L0 front-end

1 MHz

TELL1

40 MHzfront-end

40 MHz

TELL40

L. Eklund, University of Glasgow

vertex locator velo upgrade
Vertex Locator (Velo) Upgrade
  • The cooling challenge
    • Currently TPG subsrate
    • Diamond substrate?
    • Micro-channel cooling?
  • Complete replacement of modules
    • Large fraction of the infrastructure remains
    • E.g. cooling, motion, vacuum, …
  • Two options investigated
    • Strips: R-Φ geometry with reduced pitch
    • Pixel based on TimePix family of chips
  • Radiation Hardness
    • Up to 3 x 10^15 1MeV neq/cm2

L. Eklund, University of Glasgow

tracker upgrade
Tracker Upgrade
  • TT tracking station
    • Currently: Silicon strip
    • Upgrade Redesigned silicon strips
    • Share FE chip with strip Velo
  • Current main tracker
    • Inner tracker: Silicon strip
    • Outer tracker: Straw tubes
  • Two options investigated
    • Silicon strip inner tracker + Straw tube outer tracker
    • Scintillating fibre central tracker + Straw tube outer tracker

L. Eklund, University of Glasgow

rich upgrade
RICH Upgrade
  • RICH 1 and RICH 2 detectors remain
    • Remove aerogel radiator due to occupancy
    • Replace photo detectors with MaPMTs with 40 MHz read out
  • Possible addition (non-baseline): TORCH = DIRC + ToF
    • Quarts radiator with MCP photon detectors
    • 40 ps time resolution

K-π separation vsp performance

TORCH: Time Of internally Reflected Cherenkov Light

L. Eklund, University of Glasgow

calorimeter muon upgrade
Calorimeter & Muon Upgrade
  • Already used in L0 trigger
  • HCAL & ECAL: Keep detector modules and PMTs
    • Reduced PMT gain, increased FE amplification
    • Modified 40 MHz FE electronics
  • Muon Spectrometer: Keep chambers & FE electronics
    • Remove first station (M1)
    • High occupancy performance and aging under study

Calorimeter FE ASIC prototype

L. Eklund, University of Glasgow

performance benchmarks
Performance Benchmarks

Precision Measurements: Systematic uncertainties are the aim of the game !

L. Eklund, University of Glasgow

summary the lhcb upgrade
Summary: The LHCb Upgrade
  • LHCb: precision flavour physics at LHC
    • Two years of successful operation and data analysis
    • Not limited by the LHC luminosity
  • Upgrade will read out the full detector @ 40 MHz
    • Installation during LHC LS2 (2018)
    • Data rates & read-out major challenge
  • Major impact on most detector systems
    • Active R&D since several years
    • EoI, LoI endorsed by LHCC
    • Framework TDR submitted
  • To reach our physics goals:
    • Large statistics and small systematics

L. Eklund, University of Glasgow