CVD Diamond Sensor Studies

1
CVD Diamond Sensor Studies for the Beam
Calorimeter of the ILC Detector
K. Afanaciev2, I.Emelianchik2, Ch. Grah1, E.
Kouznetsova1, W. Lange1, W. Lohmann1 1 DESY,
Zeuthen 2 NCPHEP, Minsk
2
Beam Calorimeter
m-
s 102 fb (SPS1a)

• BeamCal (4-28) mrad
• fast beam diagnostics
• detection and measurement of high energetic
  electrons and photons at very small angles

s 106 fb
3
Beam Calorimeter Requirements
ILC bunch small size high charge -gt
beamstrahlung

• 15000 ee- per BX (30 60 TeV)
• 10 MGy / year for some area
• gt
• radiation hard material
• with small Moliere radius

-gt high energy deposition in the Beam Cal
Diamond/Tungsten sandwich
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pCVD Sensor Measurements

• Requirements
• - stability under irradiation
• - linearity of response

• Samples
• Fraunhofer IAF, Element Six
• 12x12 mm2, 300-900 mm

• Measurements
• Current-Voltage characteristics
• Charge Collection Efficiency
• Qmeas/Qcreated CCD/L Qcreated(MIP) 36
  eh/mm
• Irradiation tests (up to 100 Gy)
• Linearity measurements

5
pCVD Sensors Irradiation Measurements
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pCVD Sensors linearity test

• Hadronic beam, 3 5 GeV
• (CERN PS)
• Fast extraction mode
• 104-108 / 10 ns

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Linearity test wide intensity range
relative intensities estimated from PMTs (1-
600)
absolute intensity measurement
(Thermoluminescence dosimetry)
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PMT calibration
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Back to the testbeam data
HV(PMT)
L
R
intensity
absolute calibration for one of the runs 1 RI
(27.3/-2.9) 103 MIP/cm2
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Linearity of diamond response
E64
FAP2
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Conclusions

• The covered range
• the particle fluence up to 107 MIPs per bunch
• The obtained deviation from a linear response
• 30 - at the level of systematic errors of
  the fluence calibration