ecfa-calo 3-apr-03s. němeček: photodetectors for tile-hcal prototype photodetectors for tile-hcal...
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ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
Photodetectors for Tile-HCAL prototype
1. Only APD ( FZU= APD+RF-Preampli)2. I-V and C-V characteristics3. LED response of APD and of PMT measurement of
S8550 matrix and single APD4. 1/G*dG/dT , 1/G*dG/dV – compare E1 to 3x35. 16ch Preampli PCB and single APDs6. Conclusions
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
APD + Preampli
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
corrected HV bias 385.5V
corrected HV bias 387.5V
pixel E1Beam testDESY Aug02
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
I-V characteristics of APD @25°C
1.00E-03
1.00E-02
1.00E-01
1.00E+00
1.00E+01
1.00E+02
1.00E+03
0 50 100 150 200 250 300 350 400 450 500
U [V]
I [n
A]
3x3mm
5x5mmUmax=429V
Umax=395V
Thanks to ATLAS-Praha, ID-pixels group
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
C-V characteristics of APD
0
100
200
300
400
500
600
700
800
900
1000
0 50 100 150 200 250 300 350 400 450
U [V]
C [
pF
] 3x3mm
5x5mm C=(81.0 +-0.3) pF for U>350V
C=(30.1 +-0.2) pF for U>350V
Ratio 2.7 corresponds to APD-area ratio (25/9=2.8)
Thanks to ATLAS-Praha, ID-pixels group:
KEITHLEY K237 HV / I Source-Measurement, Agilent (HP) 4284A LC-meter, 10 kHz
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
Measurement Setup
APD + Preampli24*Npe
PMNpe
Nγ
3*Nγ
QPM σPM,
QAP σAP
Npe = <QPM>2 / PM 2
GPM = PM 2 / (e- *<QPM> )
GAP = <QAP> / (e- *24*Npe)
GAP = (<QAP> /(e-*24)) * PM 2 / <QPM> 2
GAP = (<QAP> / (24* <QPM>)) * GPM
<Q > = Np.e. *Gain * e-
QE(PM) = 10%QE(APD) = 80%
Green light 520nm
LED
Checked by fibres swap
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
U(APD)=390V Fibres from LED swaped:Npe APD-E1 Sadc Sped PM(850V) Sadc Sped Npe(APD) Ratio E1/PMT Npe/F(E1) F(E1) E6*G370.4 885.55 82.25 13.31 845.21 43.92 0.37 977.8 1.048 119.0 8.21 3.57210.1 591.50 71.61 13.21 572.80 39.51 0.29 554.8 1.033 70.6 7.85 4.26145.3 416.91 61.92 13.24 405.62 33.65 0.29 383.6 1.028 47.5 8.07 4.36115.3 341.85 55.55 13.16 332.53 30.97 0.28 304.5 1.028 40.1 7.59 4.5182.2 237.45 47.00 13.18 231.89 25.57 0.28 217.1 1.024 27.7 7.84 4.4170.3 202.26 42.68 12.86 198.57 23.68 0.28 185.6 1.019 24.7 7.52 4.4155.2 160.08 38.36 12.91 156.36 21.05 0.29 145.7 1.024 19.6 7.42 4.4347.6 136.78 35.68 13.23 134.72 19.53 0.36 125.6 1.015 17.0 7.37 4.4238.5 108.98 31.92 13.04 107.67 17.36 0.29 101.6 1.012 14.0 7.26 4.3727.8 77.58 27.99 13.01 77.42 14.68 0.29 73.5 1.002 9.8 7.50 4.34
U(APD)=424VNpe APD3x3 Sadc Sped PM(1025V) Sadc Sped Npe(APD)Ratio APD3x3/PMTNpe/F(APD3x3)F(APD3x3) U=424VE6*G
72.2 841.95 40.93 13.28 760.98 89.55 1.68 1733.7 1.106 472.9 3.67 16.4649.2 615.37 35.76 13.30 564.40 80.47 1.69 1181.2 1.090 343.7 3.44 17.9238.8 490.60 32.21 13.32 452.88 72.74 1.68 930.8 1.083 279.9 3.33 18.2531.7 398.31 30.40 13.22 362.80 64.43 1.64 761.5 1.098 211.7 3.60 17.8724.4 320.16 27.62 13.44 291.10 58.91 1.70 586.5 1.100 176.1 3.33 18.6119.4 257.99 25.78 13.35 235.05 53.40 1.63 465.4 1.098 136.8 3.40 18.9414.7 201.74 23.35 13.28 182.36 47.60 1.69 352.7 1.106 110.3 3.20 19.3911.5 154.63 21.30 13.42 139.78 41.27 1.59 275.7 1.106 87.4 3.15 19.018.3 112.89 19.92 13.31 100.85 35.10 1.66 198.6 1.119 58.0 3.42 19.055.8 74.88 18.11 13.31 66.46 27.59 1.65 139.8 1.127 37.2 3.76 17.83
S/N = 6.7
S/N = 8.6
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
Normalized Ratio APD to PMT
0.90000
0.95000
1.00000
1.05000
1.10000
0.0 200.0 400.0 600.0 800.0 1000.0 1200.0 1400.0 1600.0 1800.0 2000.0
LED Intensity ( Npe_PM)
APD3x3/PM U=424V
E1/PM U(APD)=390V+2.5%
-2.5%
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
Excess Noise Factor F
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
0.0 200.0 400.0 600.0 800.0 1000.0 1200.0 1400.0 1600.0 1800.0 2000.0
Npe (APD)
F
F(APD3x3) U=424V
F(E1) U=390V
F = difference of APD noise from one expected based on Poissonian statistics
<QAP> 2 / ( AP 2 - AP
Noise 2 F
APNoise … measured as pedestal width (LED off)
24*Npe ( APD value calculated from PMT one)
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
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)
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
Gain dependence on temperature
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
Gain dependence on voltage
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
Gain dep. on U, compare E1 to 3x3
Pixel E1
Single APD 3x3 mm2
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
PCB 16 ch. Preampli (FZU)
ECFA-Calo 3-Apr-03 S. Němeček: Photodetectors for Tile-HCAL prototype
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