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The LaBr3(:Ce) large prototype Angela Papa Developments of Researches in Lepton Flavour Physics with Muons April 5-6, 2018 Tokyo, Japan 1
The LaBr3(:Ce) large prototype
Angela Papa
Developments of Researches in Lepton Flavour Physics with Muons
April 5-6, 2018 Tokyo, Japan
1
Overview
• Introduction: The framework
• LaBr3(:Ce) properties: A reminder
• The LaBr3(:Ce) large prototype for MEGII
• MC simulation: Preliminary
• Technical drawings: Preliminary
• To do’s list
• Schedule2
Introduction
• The aim: performing a gamma calorimetry R&D for future experiments (cLFV etc.)
• If successful: Upgrading the current CEX AUX detector
• Appealing characteristics: Simultaneous high energy and timing resolutions (similar to LXe without requiring cryogenic)
• Grant: RLM funding
3
The LaBr3(:Ce) properties
• Very attractive medium due to: ultra high light yield, fast response, high density (relative compact size)
• Comparison with other scintillators via the figure of merite F.o.M. = p(⇢ · LY
⌧)
4
The LaBr3(:Ce) optical properties
• Good coupling to photosensors via quartz window: Emission spectrum at 380 nm, refractive index ~1.9
• Handling precaution: hydroscopic
B = borosilicate W = UV glass Q = quartz face plate
i.e. PMT i.e. sensL MPPC i.e. Hamamatsu MPPCSensor: MicroFC-30035-SMT Sensor: S13360-xx50PE/CS
5
The LaBr3(:Ce) for high energy gamma calorimetry
• Well established low energy gamma calorimetry with detector sizes of 1”x1”, 2”x2” and 3”x3”
• In rapid development for PET applications
• Challenge for high energy [O(50 MeV)] gamma calorimetry: big size crystals. Ideal 5” x 8-10”, tested 3.5” x 9”, proved 3.5” x 8”i.e. 2” x 2” M. Ciema!a et al. NIMA 608 (2009) 76–79
i.e. 3” x 3” Our medium detector
6
The LaBr3(:Ce) for high energy gamma calorimetry
• Well established low energy gamma calorimetry with detector sizes of 1”x1”, 2”x2” and 3”x3”
• In rapid development for PET applications
• Challenge for high energy [O(50 MeV)] gamma calorimetry: big size crystals. Ideal 5” x 8-10”, tested 3.5” x 9”, available 3.5” x 8”
i.e. 5” x 10” vs 3.5” x 8”
RM ⇡ 0.0265 ·X0 · (Z + 1)= 2.3 cm
X0 ⇡716.4 ·A
Z(Z + 1) · ln(287/pZ)
= 2.1 cm9.7Xo - 1.9 RM 11Xo - 3 RM
7
The LaBr3(:Ce) Large Prototype: Ideal case
• Ideal and reference case: LaBr3(:Ce) 5” x 8”, both faces coupled to MPPC Hamamatsu S13360-6025PE
• MC simulation predictions: Excellent/Very promising (sigma_E refers to the sigma_right) �E/E = 1.6± 0.1% �t = 30� 40 ps
E_gamma = 55 MeV, LaBr3(:Ce) vs NaI Patrick’s master thesis
8
The LaBr3(:Ce) Large Prototype: What we can build
• Crystal size: LaBr3(:Ce) 3.5” x 8”
• Double readout with a phase approaching: phase I - Front single readout [O(115-175 ch)]; phase II - Double readout [O(230-350 ch)]
• Photosensors: Hamamatsu S13360-6025 vs sensL MicroFJ-60035TSV
• MCX Connectors and either K_01152-07 Huber+Suhner or RG174 cables
• FR4 PCB based feedthroughs, Al2O3 PCB boards for the photosensors
• DAQ: At the beginning sharing available channels from AUX devices (i.e. SciFi channels etc.)
9
The LaBr3(:Ce) Large Prototype: The Crystal
• R&D in collaboration with Saint Gobain
• The first large crystal with double quartz window sealed inside a thin Al case
• The advent of the MPPC open the door to a more performing detector with either a front single face readout vs standard back single readout or a double readout
Impinging radiation 10
The LaBr3(:Ce) Large Prototype: The Photosensors
• The high LY and the short X_0 point towards relative small pixel size (< 50 um)
• Controlled number of DAQ channels: relative large sensor size (> 3x3 mm2)
• Two candidates: Hamamatsu S13360-6025 and sensL MicroFJ-60035TSV; active area 6 x 6 mm2, pixel size respectively 25 um and 35 um
Package [mm2]
Active area [mm2]
No. Of pixels
Fill factor [%]
PDE [%]
PCB cov.[%]
F.o.M
Hamamatsu 7.35 x 6.85 6.0 x 6.0 57600 47 18-20 69 4.5E+03
sensL 6.13 x 6.13 6.07 x 6.07 22292 75 33-43 91 4.1E+03
F.o.M. = No pixel x PDE x PCB cov. / price
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The LaBr3(:Ce) Large Prototype: The Photosensors• Planned direct measurements to compare the two photosensors
• Samples from both companies already received
• Dedicated tool for the soldering procedure: Mask (pitch~150 um, height 1mm). If sensL will be selected the soldering will be done by the company
12
The LaBr3(:Ce) Large Prototype: The Edep
0 10 20 30 40 50 60 (in MeV)depE
0
50
100
150
200
250
300
= 52.44(7) MeV/cµ_1 = 1.26(5) MeV/cσ
Resolution: 0.0241(10)
Hamamatsu, Front Readout
0 10000 20000 30000 40000 50000 60000 70000 80000phN
020406080
100120140160180200220
= 64868(134) µ_1 = 3655(78) σ
Resolution: 0.0563(12)
Hamamatsu, Front Readout
0 10 20 30 40 50 60 (in MeV)depE
0
50
100
150
200
250
300
= 52.30(8) MeV/cµ_1 = 1.36(6) MeV/cσ
Resolution: 0.0261(11)
sensL, Front Readout
0 20 40 60 80 100 120 140 160 180310×
phN0
50
100
150
200
250
= 138876(320) µ_1 = 6007(174) σ
Resolution: 0.0433(13)
sensL, Front Readout
• The energy deposit histogram and the relative energy resolution (right)
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Patrick’s task
Preliminary
The Reconstructed energy: Double readout
0 10000 20000 30000 40000 50000 60000 70000phN
0
50
100
150
200
250
300
= 53871(89) µ_1 = 3906(69) σ
Resolution: 0.0725(13)
Hamamatsu, Single Readout
0 20 40 60 80 100 120 140310×
phN0
50
100
150
200
250
300
= 137472(161) µ_1 = 3325(86) σ
Resolution: 0.0242(6)
Hamamatsu, Double Readout
0 20 40 60 80 100 120 140310×
phN0
50
100
150
200
250
= 113688(199) µ_1 = 8749(164) σ
Resolution: 0.0770(14)
sensL, Single Readout
0 50 100 150 200 250 300310×
phN0
50
100
150
200
250
300
= 302179(393) µ_1 = 7248(215) σ
Resolution: 0.0240(7)
sensL, Double Readout
0 10000 20000 30000 40000 50000 60000 70000phN
0
50
100
150
200
250
300
= 53871(89) µ_1 = 3906(69) σ
Resolution: 0.0725(13)
Hamamatsu, Single Readout
0 20 40 60 80 100 120 140310×
phN0
50
100
150
200
250
300
= 137472(161) µ_1 = 3325(86) σ
Resolution: 0.0242(6)
Hamamatsu, Double Readout
0 20 40 60 80 100 120 140310×
phN0
50
100
150
200
250
= 113688(199) µ_1 = 8749(164) σ
Resolution: 0.0770(14)
sensL, Single Readout
0 50 100 150 200 250 300310×
phN0
50
100
150
200
250
300
= 302179(393) µ_1 = 7248(215) σ
Resolution: 0.0240(7)
sensL, Double Readout
• Collected photon with sensL double wrt hamamatsu
• Similar resolutions with both sensors: No limitation from photon statistics statistics, No saturation
14
The Reconstructed energy: Single readout
0 10 20 30 40 50 60 (in MeV)depE
0
50
100
150
200
250
300
= 52.44(7) MeV/cµ_1 = 1.26(5) MeV/cσ
Resolution: 0.0241(10)
Hamamatsu, Front Readout
0 10000 20000 30000 40000 50000 60000 70000 80000phN
020406080
100120140160180200220
= 64868(134) µ_1 = 3655(78) σ
Resolution: 0.0563(12)
Hamamatsu, Front Readout
0 10 20 30 40 50 60 (in MeV)depE
0
50
100
150
200
250
300
= 52.30(8) MeV/cµ_1 = 1.36(6) MeV/cσ
Resolution: 0.0261(11)
sensL, Front Readout
0 20 40 60 80 100 120 140 160 180310×
phN0
50
100
150
200
250
= 138876(320) µ_1 = 6007(174) σ
Resolution: 0.0433(13)
sensL, Front Readout
0 10 20 30 40 50 60 (in MeV)depE
0
50
100
150
200
250
300
= 52.44(7) MeV/cµ_1 = 1.26(5) MeV/cσ
Resolution: 0.0241(10)
Hamamatsu, Front Readout
0 10000 20000 30000 40000 50000 60000 70000 80000phN
020406080
100120140160180200220
= 64868(134) µ_1 = 3655(78) σ
Resolution: 0.0563(12)
Hamamatsu, Front Readout
0 10 20 30 40 50 60 (in MeV)depE
0
50
100
150
200
250
300
= 52.30(8) MeV/cµ_1 = 1.36(6) MeV/cσ
Resolution: 0.0261(11)
sensL, Front Readout
0 20 40 60 80 100 120 140 160 180310×
phN0
50
100
150
200
250
= 138876(320) µ_1 = 6007(174) σ
Resolution: 0.0433(13)
sensL, Front Readout
• Phase I: Photosensors & DAQ only on the front (incident) face
• sensL option performs better than hamamatsu option: 4.3 +- 0.1 vs 5.6 +-0.1
• For completeness: Single readout (only back face): 7.3% [Hamamatsu], 7.7% [sensL]
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Shower inside the crystal
50− 40− 30− 20− 10− 0 10 20 30 40 50 X [in mm]
50−
40−
30−
20−
10−
0
10
20
30
40
50
Y [in
mm
]
2−10
1−10
1
10
Edep
[a.u
.]
Frontal, 16 mm Diameter
50− 40− 30− 20− 10− 0 10 20 30 40 50 X [in mm]
50−
40−
30−
20−
10−
0
10
20
30
40
50
Y [in
mm
]
2−10
1−10
1
10
210
Edep
[a.u
.]
Frontal, 5 mm Diameter
50− 40− 30− 20− 10− 0 10 20 30 40 50 X [in mm]
50−
40−
30−
20−
10−
0
10
20
30
40
50
Y [in
mm
]
2−10
1−10
1
10
210
Edep
[a.u
.]
Frontal, pointlike
100− 50− 0 50 100 Z [in mm]
50−
40−
30−
20−
10−
0
10
20
30
40
50
Y [in
mm
]
2−10
1−10
1
10
Edep
[a.u
.]
Lateral, 16 mm Diameter
100− 50− 0 50 100 Z [in mm]
50−
40−
30−
20−
10−
0
10
20
30
40
50
Y [in
mm
]
2−10
1−10
1
10
210
Edep
[a.u
.]
Lateral, 5 mm Diameter
100− 50− 0 50 100 Z [in mm]
50−
40−
30−
20−
10−
0
10
20
30
40
50
Y [in
mm
]
2−10
1−10
1
10
210
Edep
[a.u
.]
Lateral, Pointlike
• i.e. Hamamatsu double readout; 55 MeV gamma with different impinging conditions. No difference in energy resolution
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Detector assembly: Option 1
• Very thin entrance window: Carbon fiber (1 mm) vs Tedlar foil (35 um)
• Light tight only
17
Detector assembly: Option 1
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Detector assembly: Option 2
• Very thin entrance window: Carbon fiber (1 mm)
• Vacuum tight ( and consequently light tight)
19
Detector assembly: Option 2
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To do’s list
• Test and select the photosensors
• Sensor PCB production (delicate part: sensor soldering)
• Test and select the assembly options
• Feedthrough production and test
• Detector assembly
• Detector commissioning with MEGII calib. tools (intrinsic radioactivity, 4.4, 9., 11.6, 17.6)
• CEX reaction
• …
• Charge collection optimization
• Timing algorithm
• Position algorithm21
Schedule 2018
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CrystalPhotosensor selectionPhotosensor delivery
Photosensor char.PCB assembly
Case productionFeedthrought production
Detector assemblyDetector commissioning
Text with CEX
A M J J A S O N D
Back-up
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Shower inside the crystal• Hamamatsu double readout; 55 MeV gamma with different impinging conditions. No difference in energy resolution
0 5 10 15 20 25 30 35 40 45 50 R [in mm]
2−10
1−10
1
10
210
310
Edep
[a.u
.]
Radius, 16 mm Diameter
0 5 10 15 20 25 30 35 40 45 50 R [in mm]
2−10
1−10
1
10
210
310
Edep
[a.u
.]
Radius, 5 mm Diameter
0 5 10 15 20 25 30 35 40 45 50 R [in mm]
3−10
2−10
1−10
1
10
210
310
Edep
[a.u
.]
Radius, pointlike
100− 50− 0 50 100 Z [in mm]
2−10
1−10
1
10
210
310
Edep
[a.u
.]
Depth, 16 mm Diameter
100− 50− 0 50 100 Z [in mm]
2−10
1−10
1
10
210
310
Edep
[a.u
.]
Depth, 5 mm Diameter
100− 50− 0 50 100 Z [in mm]
2−10
1−10
1
10
210
310
Edep
[a.u
.]
Depth, Pointlike
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