G.Villani Aug. 07 1

CALICE pixel Laser testing update

Laser MIP equivalent calibration update• Si detector coupled to low noise CA + differentiator (no shaper)• Amplifier Gain measured ~ 7mV/MIP (c.a. 3 times lower than nominal value, confirmed with manufacturer) • Amount of stray light reduced by using a small dark cylinder around the sensor

Black cylinder

G.Villani Aug. 07 2

CALICE pixel Laser testing

A250CF cal - Qvs V -

-2

0

2

4

6

8

10

12

14

16

18

0.498 3.82 7.24 10.53 13.58 16.78

V(mV)

Q(f

C)

Q(fC)=((2.6566+/-0.3)/3.25+V/3.25-1)*3.2A250CF calibration using injected charge through capacitor and pulse

generator

MIP charge signalnoise signal

G.Villani Aug. 07 3

CALICE pixel Laser testing

A250CF cal -Vout (laser E)

V = 1.1429*(%/25+1)2 - 3.4731*(%/25+1) + 14.656 +/-0.0272*(%/25+1)^2-0.0088*(%/25+1)+0.41

0

5

10

15

20

25

30

0 25 50 75 100

% Laser intensity

Vo

(mV

)

Laser output measurement - Vout vs

% intensity.

Laser output 0% Laser output 100%

G.Villani Aug. 07 4

CALICE pixel Laser testing

Q vs % laser intensity

-2

0

2

4

6

8

10

12

14

16

0 25 50 75 100

% Laser intensity

Q(f

C)

MIP eqv vs. % Laser intensity

-0.5

0

0.5

1

1.5

2

2.5

0 25 50 75 100

% Laser intensity

MIP

eqv

Q generated vs % laser intensity – MIP- eqv generated vs % laser intensity with EMI and

amplifier noise quadrature-subtracted

MIP-eqv calibration accurate to +/-15%

MIP ‘noise’Q in S3590-A

G.Villani Aug. 07 5

CALICE pixel Laser testing

Next step:• Refined calibration using non coated sensor and thru-hole sensor housing(back scattered light, non uniformity of thickness)• Study of laser temporal profile (for deconvolution of sensor response)• Comparison of Laser signal with radiation source signal• Calibration using different MIP ranges • SW control from DAQ

ND filters for different MIP ranges

Sensor housing

G.Villani Aug. 07 6

CALICE pixel Deep P-Well simulation

3D simulation of final layout with all around DPW ∆Q ~ 10% @ 2.2*105 pointsc.a. 40 hits points simulated

S1

0

100

200

300

400

500

600

700

800

1

3

5

S1 S2 S3 S4 S5 S6

G.Villani Aug. 07 7

ConclusionsConclusions

• Laser sub-MIP calibration accomplished: further refinement and verifications ongoing

• Full pixel simulation with final layout ongoing

CALICE pixel summary