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CVD Diamond Sensor Studies for the Beam Calorimeter of the ILC Detector

CVD Diamond Sensor Studies for the Beam Calorimeter of the ILC Detector. K. Afanaciev 2 , I.Emelianchik 2 , Ch. Grah 1 , E. Kouznetsova 1 , W. Lange 1 , W. Lohmann 1 1 DESY, Zeuthen 2 NCPHEP, Minsk. Beam Calorimeter. ~. e -. μ -. χ 0. m +. Z 0. ~. e +. μ +. χ 0. -. e. -.

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CVD Diamond Sensor Studies for the Beam Calorimeter of the ILC Detector

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  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 ~ e- μ- χ0 m+ Z0 ~ e+ μ+ χ0 - e - e g m - m + g + + e e m- σ ~ 102 fb (SPS1a) • BeamCal: (4-28) mrad • fast beam diagnostics • detection and measurement of high energetic electrons and photons at very small angles σ ~ 106 fb

  3. Beam Calorimeter Requirements: • ILC bunch: • small size • high charge • -> beamstrahlung : ~15000 e+e- per BX (30 – 60 TeV) ~10 MGy / year for some area => • radiation hard material • with small Moliere radius -> high energy deposition in the Beam Cal: Diamond/Tungsten sandwich

  4. pCVD Sensor Measurements Sr90 ADC PA delay diamond discr & Gate discr scint. PM1 PM2 • 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: ~50% ~ 0.15 Gy/h ~ 0.60 Gy/h

  6. pCVD Sensors linearity test: 17 s 10 ns Scint.+PMT& Diamond (+ PA) gate signal ADC • Hadronic beam, 3 & 5 GeV (CERN PS) Fast extraction mode ~104-108 / ~10 ns

  7. Linearity test wide intensity range: HV(PMT) L R intensity relative intensities estimated from PMT’s: ~(1- 600) + absolute intensity measurement (Thermoluminescence dosimetry)

  8. PMT calibration

  9. 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

  10. Linearity of diamond response E64 FAP2

  11. 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

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