wp2 summary of activities at oxford dr b camanzi on behalf of the university of oxford group

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



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


Scope Keithley

Two-channel demonstrator system


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



55/15/15

SiPM characterisationSiPM characterisation



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


Ch 1 69.6 71.10

Ch 2 69.6 70.96


Ch 1 68.2 69.63

Ch 2 68.2 69.63


Ch 1 68.5 70.80

Ch 2 69.4 71.79


Hamamatsu 3x3mmHamamatsu 3x3mm22 50 50mm

Courtesy M AhmedCourtesy M Ahmed


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


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


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)



1010/15/15

Timing resolution studiesTiming resolution studies



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


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


Courtesy M AhmedCourtesy M Ahmed


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



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



1515/15/15

wp2 summary of activities at oxford dr b camanzi on behalf of the university of oxford group

Documents

wp2 meeting lyon

oxford dr b camanzi

ahmed b camanzi

v bias v hamamatsu 3x3mm

best sipm candidates

oxford university led

events hamamatsu 3x3mm

function of sipm v bias