Transcript Banc de test SiPM

MPPC TEST BENCH @ LLR
October 2007 status
S. Chollet
A. Debraine
Y. Geerebaert
F. Moreau
J-C. Vanel
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
MPPC : Multi-Pixel Photon Counter

What do we want to measure ?
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Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
Reverse current vs Vop (Vbr+ΔV)
Gain vs Vop
Dark Noise Rate vs Vop
Photo detection efficiency P.D.E.
(relative to PMT)
INGRID Meeting / November 1st 2007 / Japon
Test bench Setup

Setup for calibration (orange) and MPPC Parameters measurement (Blue)
Dark box
Ambient
temperature
measurement
PM Tube

Ireverse=f(Vop)

Data from oscilloscope :
Source meter

GPIB
10 KΩ
BLUE LED
Data from Source Meter :

Vpol
OPTICAL FIBERS
LED
Pulse
generator
High Voltage

I=f(V)
100 nF
Trigger on:
pulse in the dark
LED pulse generator
Calibration pulse generator
Oscilloscope
500 MHz, 5 Gs/s
MPPC
Calibration
Pulse
generator
GAIN : Histograms of integrated
pulses (in the dark, with few
photoelectrons & calibration)
DNR : V=f(t) during 2 ms.
(1ns/sample)
C 68.4 pF
20 dB
Attenuator
0 to 12 dB
Voltage
Attenuator
Amplifier
Gain 38.5 dB
BW 1 GHz
Trigger
(or trigger on signal it-self)
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
Test bench Setup
attenuators
Calibration pulse generator
Source
Meter
Oscilloscope
MPPC
PM Tube
LED pulse generator
Optical fibers
T° measurement
Voltage
Amplifier
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
LED
INGRID Meeting / November 1st 2007 / Japon
Automatic reverse current measurement I=f(Vop)

Data from Source Meter :

Ireverse=f(Vop)
 Determine normal/geiger mode limit:
 Define a Vop range for next
measures
 Measure leakage current in normal
mode
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
Electronic calibration

Simulation of the MPPC pulse shape at the input of the voltage amplifier
Single photoelectron pulse
Very similar
Calibration pulse
Oscilloscope
500 MHz, 5 Gs/s
Calibration
Pulse
generator
C 68.4 pF
20 dB
Attenuator
0 to 12 dB
Voltage
Attenuator
Amplifier
Gain 38.5 dB
BW 1 GHz
Trigger
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
Electronic calibration

Simulation of the MPPC pulse shape at the input of the voltage amplifier

Measurement of Vin amplitude @ 20dB : 6,79 mV
Assume linearity of attenuators

Slope V.ns/mV is converted in V.ns/eUsing pulse shape and assuming 50 ohms input impedance
CALIBRATION Value (V.ns/e-)
Oscilloscope
500 MHz, 5 Gs/s
Calibration
Pulse
generator
C 68.4 pF
20 dB
Attenuator
0 to 12 dB
Attenuator
Voltage
Vin Amplifier
Gain 38.5 dB
BW 1 GHz
Trigger
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
MPPC Gain measurement

Setup for MPPC gain measurement
Dark box
Ambient
temperature
measurement
Vpol
LED
Pulse
generator
Source meter
10 KΩ
BLUE LED
100 nF
Oscilloscope
500 MHz, 5 Gs/s
MPPC
Voltage
Amplifier
Gain 38.5 dB
BW 1 GHz
Trigger
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
MPPC Gain measurement

Gain = Qin/1.6 10-19
Correspond to 1 photoelectron peak


Qin = <[email protected].> V.ns / Calibration
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
V.ns/e-

Measured Gain = 7.67E+05
To be compared with value on MPPC bag
M=7.50E+05
INGRID Meeting / November 1st 2007 / Japon
MPPC dark noise rate (DNR) measurement

Setup for MPPC DNR measurement
Dark box
Ambient
temperature
measurement
Vpol
Source meter
10 KΩ
100 nF
Oscilloscope
500 MHz, 5 Gs/s
MPPC
Voltage
Amplifier
Gain 38.5 dB
BW 1 GHz
trigger on signal it-self
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
MPPC dark noise rate (DNR) measurement

From V=f(t) records, counting the number of pulses above a given threshold
DNR 350 KHz
A view of stacked pulses
(value on MPPC Bag : 378 kHz)
Optical Crosstalk : 25 kHz
Number of Pulses in 1 record (2ms)
Counting rate (kHz)
(value on MPPC Bag : 25 kHz)
Threshold (mV)
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
Conclusions

LLR measurements fit with Hamamatsu measurements for 1 MPPC.
TO BE DONE
1.
2.
3.
4.
5.
Measure parameters for each MPPC with a variable Vpol.
Measure precisely / improve noise of our setup.
Photo Detection Efficiency (PDE) measurement (relative to a reference PMT).
Pure digital solution (oscilloscope) seems OK for mass production test
Design of mechanics for mass production test (starting in November)
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon
Test bench for mass production setup
GPIB or
Ethernet
GPIB
Vop form 34 MPPC
+ I reverse measure
SLOW CONTROL
(RS232)
17 MPPC channels
+1 noise channel :
Multiplexed
output
FLC_SiPM
same path, but no signal
+
Diff.
17 MPPC channels
+1 noise channel :
-
FLC_SiPM
same path, but no signal
Select channel, gain, shaper, etc…
FLC_Sipm : 18 channels SiPM readout chip from LAL
Yannick Geerebaert LLR IN2P3 Ecole Polytechnique Palaiseau
France
INGRID Meeting / November 1st 2007 / Japon