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