ALICE PMD

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ALICE PMD Pre-Production Prototype
test September 1-17, 2003

• OUTLINE
• Goals for the test
• Prototype Detectors
• T10 test setup
• Results for the pion beam
• Results for the electron beam
• Simulation results
• Calibration Curve

PMD Group (Analysis by Raghu, Rashmi, Prem and
Basanta) November 22, 2003
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Goals for the PPP test

• Optimization of Fabrication Procedure
• Final cell design optimized from previous
  tests
• Fabrication procedure close the real detector
• One Super Module (SM) made containing 2 UMs
• HV isolation between the two UMs
• Quality Assurance
• Optimization during Fabrication testing
• Lab tests before shipping to CERN
• Test at CERN
• First time test of both MANAS and GASSIPLEX
• Response to hadrons
• Response to electrons
• To obtain the Calibration Curve (MeV-ADC)

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Prototype Fabrication
Gas OUT
Insulation strips
HV block
32-pin FPC Connector
Gas IN
Unit Module 1
Unit Module 2

• Unit Module size is half of the actual UM
• Boundary channels are the actual ones.

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A bit more detail about the Prototypes
Number of unit modules
2 Number of sub-modules in a unit module
4 Number of cells in a unit module
2304 Number of high voltage channels
2 Number of signal (FPC) connectors
96
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PMD - Pre-production prototype test September
1-17, 2003

• T10 Beamline at PS
• Response to hadrons using pion beam at 6GeV/c
• Response to electrons is studied using the setup
  shown above. A Cherenkov counter is placed
  upstream for the electron Trigger. Data taken at
  various energies and for different lead thickness.

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Response to pion Beam

• Pulse height spectra
• pion beam at 6GeV/c
• 1400Volts
• Data taken with both GASSIPLEX and MANAS chips

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Number of cells affected for 6GeV/c pion beam
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Mean Pulse height vs. Operating voltage
Mean Pulse height vs. Operating voltage
Similar gains for both MANAS and GASSIPLEX
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Efficiency vs. Operating voltage GASSIPLEX
MANAS
Efficiency 98.5
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Relative gain of cells
GASSIPLEX
MANAS
26 cells
41 cells
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Transverse shower spread
3GeV/c electron beam and 3X0 lead
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Pulse Height Spectra for different energy
electron beam and different lead thickness
HV1400V
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Simulation Results
Energy Deposition (EDEP) Spectra for different
energy electron beam and different lead thickness
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Calibration Curve
Energy Deposition from Data (ADC)
Energy Deposition from Simulation (EDEP)