The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group
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The LHCb RICH photon detector system Ken Wyllie, CERN on behalf of the LHCb RICH Group PowerPoint PPT Presentation


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The LHCb RICH photon detector system Ken Wyllie, CERN on behalf of the LHCb RICH Group. Introduction to the system Photon-detector: the pixel HPD Building the system Test results Conclusions and Outlook. The real LHCb. RICH1. RICH1. RICH2. RICH2. The LHCb detector and its RICHs.

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The LHCb RICH photon detector system Ken Wyllie, CERN on behalf of the LHCb RICH Group

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The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

The LHCb RICH photon detector systemKen Wyllie, CERNon behalf of theLHCb RICH Group

Introduction to the system

Photon-detector: the pixel HPD

Building the system

Test results

Conclusions and Outlook

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

The real LHCb

RICH1

RICH1

RICH2

RICH2

The LHCb detector and its RICHs

Designed to study B-physics – RICH detectors for particle identification

Virtual LHCb

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Simulation of Cherenkov Rings

RICH1

RICH2

Measuring Cherenkov Photons

Photon detector requirements

Sensitive to single photons 200nm to 600nm

Detection area 2.9m2, active fraction > 65%

2.5mm x 2.5mm channel size

25ns time precision (40MHz LHC frequency)

1MHz event rate

Low noise rate

Tolerant to B-field ~ 30G

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

ANODE

The pixel hybrid photon detector (HPD)

DEP, the Netherlands

Advantages of this hybrid, pixel structure:

low noise = excellent resolution of single photoelectrons

high channel number/density = position resolution

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

The HPD anode

Active pixel electronics mounted within HPD vacuum, binary (threshold) readout:

8192/1024 channels(two different modes of resolution)

Low noise 160 e- (signal ~ 5000 e-)

Threshold low & uniformmean 1200 e- with RMS 100 e-

High density flip-chip interconnects (bump-bonds) developed for HPD application with VTT, Finland – capable of withstanding T-cycling of vacuum processing

Readout chip

Silicon

sensor

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Building the photon detector system

484 HPDs all produced

500,000 pixels (4 million in high resolution)

Mounted in column modules

Columns closely packed

Module contains:

20kV distribution

optical data transmission

(1.6Gb/s per HPD)

local magnetic shielding

active cooling

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Building and testing the system

Bare HPDs

With mu-metal shield

36-HPD system tested in lab & test-beam using a mini-RICH detector with different gas radiators

What the Cherenkov photons see is this

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Test results

  • Lab tests with DC LED & pulsed laser

  • Optimum efficiency & low noise (dark-counts) rate < 0.005 hits per HPD per event

  • Test-beam with 500MeV electrons

  • Rings from different radiators

  • photon yields as expected

  • optimising pattern recognition for LHCb

Integrated C4F10 rings on four HPDs

Integrated N2 rings on one HPD

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Installing the system in LHCb

RICH2 being installed in LHCb underground cavern

HPD column module

HPD modules

inserted here

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Installing the system in LHCb

Photographing inside RICH2 – it’s dark!

What the Cherenkov photons see is this

60% of the HPD system is installed and being commissioned

Testing is underway with controlled light sources to ensure system is ready for data-taking with the LHC beam next year

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Conclusions and Outlook

Pixel HPD designed to meet harsh requirements of the LHCb system - proven to be an elegant & efficient detector for this type of application

Specific chip, sensor & interconnects developed for HPD application

Smaller-scale systems of HPDs tested successfully

Full system of 484 HPDs, readout electronics and services under installation for start of LHC collisions in 2008

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Spare Slides

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

LHCb Cherenkov Detectors

RICH2

RICH1

Tracking detectors

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

Polar angle of particles vs momentum

RICH1

RICH2

IWORID 2007


The lhcb rich photon detector system ken wyllie cern on behalf of the lhcb rich group

10 G Unshielded

10 G Shielded

MuMetal

MuMetal

50 G Shielded tube

2.5 G Unshielded tube

IWORID 2007


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