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Photodetectors for Tile-HCAL prototyp e

Photodetectors for Tile-HCAL prototyp e. Only APD ( FZU= APD+RF-Preampli) I-V and C-V characteristics LED response of APD and of PMT measurement of S8550 matrix and single APD 1/G*dG/dT , 1/G*dG/dV – compare E1 to 3x3 16ch Preampli PCB and single APDs Conclusions. APD + Preampli.

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Photodetectors for Tile-HCAL prototyp e

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  1. Photodetectors for Tile-HCAL prototype • Only APD ( FZU= APD+RF-Preampli) • I-V and C-V characteristics • LED response of APD and of PMT measurement of S8550 matrix and single APD • 1/G*dG/dT, 1/G*dG/dV – compare E1 to 3x3 • 16ch Preampli PCB and single APDs • Conclusions S. Němeček: Photodetectors for Tile-HCAL prototype

  2. APD + Preampli S. Němeček: Photodetectors for Tile-HCAL prototype

  3. Beam test DESY Aug02 pixel E1 corrected HV bias 385.5V corrected HV bias 387.5V S. Němeček: Photodetectors for Tile-HCAL prototype

  4. Thanks to ATLAS-Praha, ID-pixels group S. Němeček: Photodetectors for Tile-HCAL prototype

  5. Thanks to ATLAS-Praha, ID-pixels group: KEITHLEYK237 HV/ I Source-Measurement, Agilent (HP) 4284A LC-meter, 10 kHz S. Němeček: Photodetectors for Tile-HCAL prototype

  6. QE(PM) = 10% QE(APD) = 80% Green light 520nm Checked by fibres swap APD + Preampli 24*Npe PM Npe Measurement Setup <Q > =Np.e. *Gain * e- Npe = <QPM>2 / sPM 2 GPM = sPM 2 / (e- *<QPM> ) GAP = <QAP> / (e- *24*Npe) GAP = (<QAP> /(e-*24)) * sPM 2 / <QPM> 2 GAP = (<QAP> / (24* <QPM>)) * GPM QPM σPM, Nγ LED QAPσAP 3*Nγ S. Němeček: Photodetectors for Tile-HCAL prototype

  7. S/N = 6.7 S/N = 8.6 S. Němeček: Photodetectors for Tile-HCAL prototype

  8. +2.5% -2.5% S. Němeček: Photodetectors for Tile-HCAL prototype

  9. F = difference of APD noise from one expected based on Poissonian statistics <QAP> 2 / ( sAP 2 - sAPNoise 2) = No / F sAPNoise … measured as pedestal width (LED off) No = 24*Npe ( APD value calculated from PMT one) S. Němeček: Photodetectors for Tile-HCAL prototype

  10. Measured Results MAPD =GAP / ( 20 * 100) S. Němeček: Photodetectors for Tile-HCAL prototype

  11. Gain dependence on temperature S. Němeček: Photodetectors for Tile-HCAL prototype

  12. Gain dependence on voltage S. Němeček: Photodetectors for Tile-HCAL prototype

  13. Gain dep. on U, compare E1 to 3x3 Pixel E1 Single APD 3x3 mm2 S. Němeček: Photodetectors for Tile-HCAL prototype

  14. PCB 16 ch. Preampli (FZU) S. Němeček: Photodetectors for Tile-HCAL prototype

  15. 4. Conclusions • I-V and C-V characteristics were measured for single APD3x3mm2 • Gain and Excess Noise Factor F were calculated from simultaneous measurement of APD and PMT response to LED • Ratio APD/PMT response within ±2.5% • F = ~4 for single APD, better than F= ~8 for matrix (pixel E1) • Gain dependence on temperature 1/G*dG/dT = ~12% at maximal gain of E1 pixel of matrix APD (measured in range 11 to 26 °C) • Gain dependence on voltage 1/G*dG/dV is again better for single APD, 15% at maximal gain • Power supply with ΔV/V=1.E-4 gives 1% of Gain stability • Possibility of voltage-temperature regulator is under study • A prototype of PCB of 16 channels preamplifier was produced • Adaptor to single APD (instead of matrix) is under way S. Němeček: Photodetectors for Tile-HCAL prototype

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