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