Particle Identification S. Kwan

1
Particle IdentificationS. Kwan

• Identify the particle species (g,e,m,p,K,p)
• Electromagnetic Calorimeter
• Detect photons and electrons, measure their
  energies and positions
• Ring Imaging CHerenkov Detector
• Charged hadron identification
• Muon System

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Main Spectrometer
3
Cherenkov Radiation

• Cherenkov radiation is emitted when a charged
  particle in a material medium moves faster than
  the speed of light in the same medium
• Momentum measurement Cherenkov information -gt
  mass or ID of the particle

4
RICH detector

• Syracuse, FNAL/ESE
• Two identical RICH detectors
• Components
• Gaseous radiator (C4F10 )
• Aerogel radiator
• Spherical mirrors
• Photo-detectors
• Vessel to contain gas volume

Mirrors
Cherenkov photons from Bo?pp- and rest of the
beam collision
5
HPD from DEP

• Commercial supplier from Holland (DEP)
• A number of prototypes was successfully produced
  and tested for CMS
• New silicon diode customized for BTeV needs is
  under development at DEP (163 pixels per HPD) on
  schedule for prototype delivery at the end of May
  
• Challenges
• high voltages (20 kV!)
• Signal 5000e- a need low noise electronics
• In the hottest region up to 40 channels fire per
  tube
• About 2000 tubes total

g
Quartz window with a photo-cathode at -20 kV
e
Silicon diode
Pins to readout chip
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Electromagnetic Calorimetry
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EMCAL Overview

• FNAL, Minn, Syracuse, York U, China and Russia
• Based on PbWO4 crystals developed by CMS. About
  24000 crystals vs. 80000 for CMS.
• Similar to CMS endcap calorimeter
• Readout by Photomultiplier tubes (similar to
  KTeV) vs. APD and Vacuum phototriodes used by
  CMS
• modified version of QIE chip (KTeV, CDF, MINOS,
  CMS)

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RD plan for EMCAL

• Crystal acquisition
• Understand qualities of current crystals from
  Russia and China
• Understand capacities of manufacturers
• Large Russian and Chinese groups in BTeV
• Mechanical support design
• IHEP engineers, can use engineering help from the
  lab.
• QIE front-end chip design
• Design by Feb. 2002 priority
• Simulation to pin down design parameters
• Test Beam at Protvino (March/April, 2001)
• Energy, position resolution
• Radiation tolerance
• Temperature response, calibration system test

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Muon System(Vanderbilt, UIUC, Puerto-Rico,Pavia)

• Provides Muon ID and Trigger
• Trigger for interesting physics states
• Check/debug pixel trigger
• fine-grained tracking toroid
• Stand-alone mom./mass trig.
• Momentum confirmation
• Basic building block Proportional tube Planks

3 m
toroid(s) / iron
2.4 m half height
track from IP
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Overlapping Octants
2.4 m

• Detector Stations made of overlapping octants
• overlap no dead regions
• 4 layers of planks per octant
• 3 views (r, u, v, r)
• Minimizes pattern recognition confusion

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RD plan for Muon system(2001)

• Finalize electrical/mechanical design of detector
  elements
• Certify performance in beam test at TRIUMF
• Finalize geometry, quad design, and detector
  hanging scheme

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Summary

• Good progress on designs for all three systems
• Prototyping of parts on schedule
• Needs mechanical engineering help from Fermilab
  for all systems
• Needs test beam at Fermilab as soon as possible