WP2 summary of activities at Oxford
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Transcript of WP2 summary of activities at Oxford
WP2 summary of activities at WP2 summary of activities at OxfordOxford
Dr B Camanzi Dr B Camanzi On behalf of the University of Oxford On behalf of the University of Oxford
GroupGroup
OutlineOutline
Experimental set-upExperimental set-up SiPM characterisationSiPM characterisation Timing resolution studiesTiming resolution studies SummarySummary
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
22/15/15
Equipment: SiPMs and crystalsEquipment: SiPMs and crystals
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
33/15/15
Experimental set-upExperimental set-up Two-channel demonstrator: Two-channel demonstrator:
Hamamatsu 3x3mmHamamatsu 3x3mm22 50 50 m + m + LaBrLaBr33(Ce)(Ce)
2222Na sourceNa source Electronics:Electronics:
1.1. Preamps boards from Preamps boards from Photonique: Photonique: ~~700ps rise time, 700ps rise time, gain 10x-20xgain 10x-20x
2.2. Keithley 2612A two-channel Keithley 2612A two-channel Sourcemeter 200VSourcemeter 200V
DAQ: LeCroy DAQ: LeCroy WavePro 725Zi WavePro 725Zi 2.5GHz 2.5GHz oscilloscopeoscilloscope
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
Scope Keithley
Two-channel demonstrator system
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
22Na source
44/15/15
Studies carried out so farStudies carried out so far
SiPM characterisationSiPM characterisation1.1. I-V curves and breakdown voltagesI-V curves and breakdown voltages2.2. Rise time measurementsRise time measurements3.3. Single photon signalSingle photon signal
Timing resolution studies of a two-channel Timing resolution studies of a two-channel demonstrator:demonstrator:1.1. Timing resolution at SiPM VTiming resolution at SiPM Vbias bias recommended by recommended by
manufacturer manufacturer 2.2. Timing resolution as function of SiPM VTiming resolution as function of SiPM Vbiasbias
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
55/15/15
SiPM characterisationSiPM characterisation
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
66/15/15
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 voltageBreakdown voltage
SiPM type Breakdown Voltage (V)
RecommendedVbias (V)
Hamamatsu 3x3mm2 50m
Ch 1 69.6 71.28
Ch 2 69.6 71.31
Hamamatsu 3x3mm2 25m
Ch 1 69.6 71.10
Ch 2 69.6 70.96
Hamamatsu 1x1mm2 50m
Ch 1 68.2 69.63
Ch 2 68.2 69.63
Hamamatsu 1x1mm2 25m
Ch 1 68.5 70.80
Ch 2 69.4 71.79
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
Hamamatsu 3x3mmHamamatsu 3x3mm22 50 50mm
Courtesy M AhmedCourtesy M Ahmed
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
77/15/15
Rise time studiesRise time studies
Rise time (ns)
Laser LED
Hamamatsu 3x3mm2 50m 5.92 5.36
Hamamatsu 3x3mm2 25m 4.74 4.23
Photonique 2x2mm2 3.68 3.32
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
Courtesy M AhmedCourtesy M AhmedB Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
LED Width: 2ns
LaserWidth: 50ps
88/15/15
about 2ns
-20 -10 0 10 20 30 40-5
0
5
10Single Photon Pulse Shapes
Time (ns)
Mag
nitu
de (
mV
)
~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
of E
vent
s
Single photon signalSingle photon signal
Run: 80000 eventsRun: 80000 events Preamp gain: 15xPreamp gain: 15x
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
Courtesy M AhmedCourtesy M AhmedB Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
99/15/15
Future workFuture work
Acquire faster, low-noise, higher gain Acquire faster, low-noise, higher gain preampspreamps
Repeat and finish SiPM characterisation with Repeat and finish SiPM characterisation with new preampsnew preamps
Perform timing resolution studies of single Perform timing resolution studies of single SiPMs and SiPM pairsSiPMs and SiPM pairs
Select best SiPM candidate(s)Select best SiPM candidate(s)
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
1010/15/15
Timing resolution studiesTiming resolution studies
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
1111/15/15
Timing resolution at fixed VTiming resolution at fixed Vbiasbias Run: 15000 eventsRun: 15000 events Hamamatsu 3x3mmHamamatsu 3x3mm22 50 50m + m +
LaBrLaBr33(Ce) crystals(Ce) crystals Timing resolution = Timing resolution = Used VUsed Vbiasbias recommended by recommended by
Hamamatsu: 71.28V and Hamamatsu: 71.28V and 71.31V71.31V
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
0 0.5 1 1.5 2 2.5 3 3.5 40
2000
4000
6000
8000
10000
12000
14000
16000
18000
Pulse Magnitude
Magnitude (V)
Num
ber
of E
vent
s
Ch 1 = redCh 2 = blue
Cut on Ch 1 Cut on Ch 2 (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 AhmedCourtesy M AhmedB Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
1212/15/15
0
0.2
0.4
0.6
0.8
1
70 70.5 71 71.5 72 72.5
Tim
ing
re
solu
tion
(ns)
Vbias
(V)
Timing resolution – vs. – VTiming resolution – vs. – Vbiasbias
Runs: 50000 eventsRuns: 50000 events Hamamatsu 3x3mmHamamatsu 3x3mm22 50 50m + m +
LaBrLaBr33(Ce) crystals(Ce) crystals Timing resolution = Timing resolution = Used narrowest windows Used narrowest windows
around around 2222Na peakNa peak Best timing resolution of Best timing resolution of
298ps at 71.1V = 0.18-0.21V 298ps at 71.1V = 0.18-0.21V below recommended Vbelow recommended Vbiasbias
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
Courtesy M AhmedCourtesy M Ahmed
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
1313/15/15
Future workFuture work
Improve two-channel demonstrator set-up: Improve two-channel demonstrator set-up: SiPM-crystal coupling, alignments, etc.SiPM-crystal coupling, alignments, etc.
Investigate SiPM-crystal couplingInvestigate SiPM-crystal coupling Understand effects on timing resolution of Understand effects on timing resolution of
LaBrLaBr33(Ce) crystal's different geometries and Ce (Ce) crystal's different geometries and Ce concentrationconcentration
Continue timing resolution studies of two-Continue timing resolution studies of two-channel demonstrators: different SiPM types channel demonstrators: different SiPM types and also LYSO crystalsand also LYSO crystals
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
1414/15/15
SummarySummary
SiPM characterisation started: 1) breakdown SiPM characterisation started: 1) breakdown voltages, 2) rise times, 3) single photon signalvoltages, 2) rise times, 3) single photon signal
Started study of timing resolution of two-channel Started study of timing resolution of two-channel demonstrator system: 298ps (demonstrator system: 298ps ())
Future work:Future work:1.1. Repeat and complete SiPM characterisation with new Repeat and complete SiPM characterisation with new
preamps and select best candidate(s)preamps and select best candidate(s)2.2. Continue timing resolution studiesContinue timing resolution studies
ENVISION WP2 MeetingENVISION WP2 MeetingLyon 03/02/11Lyon 03/02/11
B Camanzi, STFC/RAL and B Camanzi, STFC/RAL and Oxford UniversityOxford University
1515/15/15