wp2 summary of activities at oxford
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WP2 summary of activities at Oxford. Dr B Camanzi On behalf of the University of Oxford Group. Outline. Experimental set-up SiPM characterisation Timing resolution studies Summary. Equipment: SiPMs and crystals. Experimental set-up. - PowerPoint PPT PresentationTRANSCRIPT
WP2 summary of activities at Oxford
Dr B Camanzi On behalf of the University of Oxford
Group
Outline
Experimental set-up SiPM characterisation Timing resolution studies Summary
ENVISION WP2 MeetingLyon 03/02/11
B Camanzi, STFC/RAL and Oxford University
2/15
Equipment: SiPMs and crystals
ENVISION WP2 MeetingLyon 03/02/11
Area (mm2) Cell size
Hamamatsu 1x1 25mm, 50mm, 100mm
3x3 25mm, 50mm, 100mm
Photonique 1x1 No information
2x2 No information
SensL 1x1 No information
3x3 No information
Area (mm2) Length (mm)LYSO
1x15
10
3x35
10
4x410
20
LaBr3(Ce) 3x3 30
B Camanzi, STFC/RAL and Oxford University
3/15
Experimental set-up
Two-channel demonstrator: Hamamatsu 3x3mm2 50 mm + LaBr3(Ce)
22Na source Electronics:
1. Preamps boards from Photonique: ~700ps rise time, gain 10x-20x
2. Keithley 2612A two-channel Sourcemeter 200V
DAQ: LeCroy WavePro 725Zi 2.5GHz oscilloscope
ENVISION WP2 MeetingLyon 03/02/11
Scope Keithley
Two-channel demonstrator system
B Camanzi, STFC/RAL and Oxford University
22Na source
4/15
Studies carried out so far
SiPM characterisation1. I-V curves and breakdown voltages2. Rise time measurements3. Single photon signal
Timing resolution studies of a two-channel demonstrator:1. Timing resolution at SiPM Vbias recommended by
manufacturer 2. Timing resolution as function of SiPM Vbias
ENVISION WP2 MeetingLyon 03/02/11
B Camanzi, STFC/RAL and Oxford University
5/15
SiPM characterisation
ENVISION WP2 MeetingLyon 03/02/11
B Camanzi, STFC/RAL and Oxford University
6/15
0
5 10-10
1 10-9
1.5 10-9
2 10-9
62 64 66 68 70 72
SiPM_Sl.No.330SiPM_Sl_No.331
Cur
rent
(A)
Voltage(V) Breakdown voltage
Breakdown voltage
SiPM type Breakdown Voltage (V)
RecommendedVbias (V)
Hamamatsu 3x3mm2 50mmCh 1 69.6 71.28
Ch 2 69.6 71.31
Hamamatsu 3x3mm2 25mmCh 1 69.6 71.10
Ch 2 69.6 70.96
Hamamatsu 1x1mm2 50mmCh 1 68.2 69.63
Ch 2 68.2 69.63
Hamamatsu 1x1mm2 25mmCh 1 68.5 70.80
Ch 2 69.4 71.79
ENVISION WP2 MeetingLyon 03/02/11
Hamamatsu 3x3mm2 50mm
Courtesy M Ahmed
B Camanzi, STFC/RAL and Oxford University
7/15
Rise time studies
Rise time (ns)
Laser LED
Hamamatsu 3x3mm2 50mm 5.92 5.36
Hamamatsu 3x3mm2 25mm 4.74 4.23
Photonique 2x2mm2 3.68 3.32
ENVISION WP2 MeetingLyon 03/02/11
Courtesy M AhmedB Camanzi, STFC/RAL and Oxford University
LED Width: 2ns
LaserWidth: 50ps
8/15
about 2ns
-20 -10 0 10 20 30 40-5
0
5
10Single Photon Pulse Shapes
Time (ns)
Mag
nitu
de (m
V)
~6mV
0 5 10 15 20 25 30 35 40 45 500
2000
4000
6000
8000
10000
12000
14000Dark curent signal
Magnitude (mV)
Num
ber o
f Eve
nts
Single photon signal
Run: 80000 events Preamp gain: 15x
ENVISION WP2 MeetingLyon 03/02/11
Courtesy M AhmedB Camanzi, STFC/RAL and Oxford University
9/15
Future work
Acquire faster, low-noise, higher gain preamps
Repeat and finish SiPM characterisation with new preamps
Perform timing resolution studies of single SiPMs and SiPM pairs
Select best SiPM candidate(s)
B Camanzi, STFC/RAL and Oxford University
ENVISION WP2 MeetingLyon 03/02/11
10/15
Timing resolution studies
ENVISION WP2 MeetingLyon 03/02/11
B Camanzi, STFC/RAL and Oxford University
11/15
Timing resolution at fixed Vbias Run: 15000 events Hamamatsu 3x3mm2 50mm
+ LaBr3(Ce) crystals Timing resolution = s Used Vbias recommended by
Hamamatsu: 71.28V and 71.31V
ENVISION WP2 MeetingLyon 03/02/11
0 0.5 1 1.5 2 2.5 3 3.5 40
2000
4000
6000
8000
10000
12000
14000
16000
18000Pulse Magnitude
Magnitude (V)
Num
ber o
f Eve
nts
Ch 1 = redCh 2 = blue
Cut on Ch 1 Cut on Ch 2 s (ns) N. of Events
2.000 - 2.400 2.100 - 2.500 1.1598 4459
2.100 - 2.300 2.200 - 2.400 1.0151 3018
2.150 - 2.250 2.250 - 2.350 0.7625 1086
2.180 - 2.220 2.28 0- 2.320 0.5684 154
2.190- 2.210 2.29 0- 2.310 0.4384 29
2.195 - 2.205 2.295 - 2.305 0.4133 5Courtesy M AhmedB Camanzi, STFC/RAL and Oxford University
12/15
0
0.2
0.4
0.6
0.8
1
70 70.5 71 71.5 72 72.5
Tim
ing
reso
lutio
n (n
s)
Vbias
(V)
Timing resolution – vs. – Vbias
Runs: 50000 events Hamamatsu 3x3mm2 50mm
+ LaBr3(Ce) crystals Timing resolution = s Used narrowest windows
around 22Na peak Best timing resolution of
298ps at 71.1V = 0.18-0.21V below recommended Vbias
ENVISION WP2 MeetingLyon 03/02/11
Courtesy M Ahmed
B Camanzi, STFC/RAL and Oxford University
13/15
Future work
Improve two-channel demonstrator set-up: SiPM-crystal coupling, alignments, etc.
Investigate SiPM-crystal coupling Understand effects on timing resolution of
LaBr3(Ce) crystal's different geometries and Ce concentration
Continue timing resolution studies of two-channel demonstrators: different SiPM types and also LYSO crystals
B Camanzi, STFC/RAL and Oxford University
ENVISION WP2 MeetingLyon 03/02/11
14/15
Summary
SiPM characterisation started: 1) breakdown voltages, 2) rise times, 3) single photon signal
Started study of timing resolution of two-channel demonstrator system: 298ps (s)
Future work:1. Repeat and complete SiPM characterisation with
new preamps and select best candidate(s)2. Continue timing resolution studies
ENVISION WP2 MeetingLyon 03/02/11
B Camanzi, STFC/RAL and Oxford University
15/15