CALICE pixel Laser testing update
description
Transcript of CALICE pixel Laser testing update
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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
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G.Villani Aug. 07 2
CALICE pixel Laser testing
A250CF cal - Qvs V -
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Q(f
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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
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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
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Laser output measurement - Vout vs
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Laser output 0% Laser output 100%
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G.Villani Aug. 07 4
CALICE pixel Laser testing
Q vs % laser intensity
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MIP eqv vs. % Laser intensity
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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
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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
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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
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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