Photodetectors for Tile-HCAL prototype

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Photodetectors for Tile-HCAL prototype

1. Only APD ( FZU APDRF-Preampli)
2. I-V and C-V characteristics
3. LED response of APD and of PMT measurement of
   S8550 matrix and single APD
4. 1/GdG/dT , 1/GdG/dV compare E1 to 3x3
5. 16ch Preampli PCB and single APDs
6. Conclusions

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Beam test DESY Aug02
pixel E1
corrected HV bias 385.5V
corrected HV bias 387.5V
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Thanks to ATLAS-Praha, ID-pixels group
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Thanks to ATLAS-Praha, ID-pixels group
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Thanks to ATLAS-Praha, ID-pixels group
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Thanks to ATLAS-Praha, ID-pixels group
KEITHLEY K237 HV / I Source-Measurement,
Agilent (HP) 4284A LC-meter, 10 kHz

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Measurement Setup
ltQ gt Np.e. Gain e-

• Npe ltQPMgt2 / sPM 2
• GPM sPM 2 / (e- ltQPMgt )
• GAP ltQAPgt / (e- 24Npe)
• GAP (ltQAPgt /(e-24)) sPM 2 / ltQPMgt 2
• GAP (ltQAPgt / (24 ltQPMgt)) GPM

QPM sPM,
N?
LED
QAP sAP
3N?
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S/N 6.7
S/N 8.6
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2.5
-2.5
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• F difference of APD noise from one expected
  based on Poissonian statistics
• ltQAPgt 2 / ( sAP 2 - sAPNoise 2 ) No / F
• sAPNoise measured as pedestal width (LED off)
• No 24Npe ( APD value calculated
  from PMT one)

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Measured Results
S8550, E1 U 388 V U 390 V
GAP 1.42 106 1.65 106
MAPD 710 825
APD 3x3 U 399 V U 424 V
GAP 0.21 106 0.84 106
MAPD 105 420
MAPD GAP / ( 20 100)
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Gain dependence on temperature
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Gain dependence on voltage
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Gain dep. on U, compare E1 to 3x3
Pixel E1
Single APD 3x3 mm2
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PCB 16 ch. Preampli (FZU)
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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/GdG/dT 12
  at maximal gain of E1 pixel of matrix APD
  (measured in range 11 to 26 C )
• Gain dependence on voltage 1/GdG/dV is again
  better for single APD, 15 at maximal gain
• Power supply with ?V/V1.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