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ECFA-DESY Prague NOV `02 Ivo Polak 1 APD-NOV02 APD + Preamplification.

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Presentation on theme: "ECFA-DESY Prague NOV `02 Ivo Polak 1 APD-NOV02 APD + Preamplification."— Presentation transcript:

1 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 1 APD-NOV02 APD + Preamplification

2 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 2 Present results we tested behavior of APD Hamamatsu S8550 32 channel matrix gain, uniformity preamplifier matching gain distribution

3 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 3 Future plans crosstalk test on matrix APD S8550 preamp optimisation 16 channel system for minical study, test of filtering, shaping

4 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 4 following Uniformity APD matrix Gain distribution APD + PreAmp DC gain graph Histograms of pulse response

5 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 5 UNIFORMITY 4*8 pixels S8550 APD

6 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 6 UNIFORMITY marked high dark current, E1 pixel

7 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 7 APD matrix uniformity

8 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 8 APD matrix uniformity

9 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 9

10 10

11 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 11 DC gain APD pixel E1

12 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 12 DC gain APD pixel E1

13 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 13 DC gain formula How the Gain M is calculated? M = (Is – Id) / Is1 M gain of APD Is signal current (illuminated) Id dark current Is1 signal at low HV (M = 1)

14 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 14 DC gain APD pixel D4

15 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 15 DC gain APD pixel D4

16 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 16 corrected HV bias 385.5V corrected HV bias 387.5V pixel E1 Beam test

17 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 17 LED HV bias 1V diff

18 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 18 LED APD out by 2

19 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 19 LED

20 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 20 LED long fetching

21 ECFA-DESY Prague NOV `02 Ivo Polak polaki@fzu.cz 21 Any questions? Thank you.

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