CAT of AGATA detectors &The AGATA triple cluster detector
AGATA Week July 2008
University of CologneAndreas Wiens
B. Birkenbach, B. Bruyneel, J. Eberth, H. Hess, D. Lersch, G. Pascovici, P. Reiter - IKP Cologne
H.-G. Thomas - CTT
Overview
• Acceptance test results
• Status of the triple cluster detectors
• Crosstalk in triple cluster detector
• Summary
Core
at 1.3MeV: ≤ 2.35keVat 122keV: ≤ 1.35keV
Segments
at 1.3MeV: ≤ 2.30keV, mean ≤ 2.10keVat 60keV: ≤ 1.30keV, mean ≤ 1.20keV
Crosstalk ≤1‰
Experimental setup & specifications
Test results A002 & A003 after gluing core contactA002 - FWHM
A1 A6 B6 C1
D1
D6 E6 F10
0,5
1
1,5
2
2,5
Core B1 C6 E1 F6
FW
HM
[k
eV
]
59.6 keV 1332.5 keV Specification low energy 1,3 Specification high energy 2,3
A003 - FWHM
A1 A6 B6 C1 D1 D6 E6 F1
0
0,5
1
1,5
2
2,5
3
Core B1 C6 E1 F6
FW
HM
[k
eV
]
59.6 keV 1332.5 keV Specification low energy 1,3 Specification high energy 2,3
A003 detector accepted
A002 detector accepted
Test results C004
f6f1e6e1d6d1c6c1b6b1a6core a10
0,5
1
1,5
2
2,5
59.6 keV 1332.5 keV Specification low energy Specification high energy
detector accepted
Test results A004
a1core a6 b1 b6 c1 c6 d1 d6 e1 e6 f1 f6
0
0,5
1
1,5
2
2,5
3
59.6 keV 1332.5 keV Specification low energy Specification high energy
Very good performance at low energies
low impurity concentration: crystal properties? trapping?
detector rejected
front seg. A1
back seg.F5
FWHM:2.66 keV
FWHM:2.83 keV
Test results B001
leakage current
damage at the contact or the implantation layer of A3 and C3 ?
detector rejected
1,2 MeV 1,3 MeV
Core 6 µs 2,66 2,77
3 µs 2,43 2,45
A3 6 µs 3,03 3,06
3 µs 2,44 2,53
C3 6 µs 2,48 2,48
3 µs 2,16 2,29
0
0,5
1
1,5
2
2,5
3
3,5
Core B1 C6 E1 F6
FW
HM
[ke
V]
59.6 keV 1332.5 MeV Specification low energy Specification high energy
C3
2.06 keV @ 59.5 keV
Test results B004First delivery: Dec 08B004 – missing segment F6 after first delivery
Second delivery: Jun 08Core @ 59.5/122 keV FWHM: 1.5/1.6 keV @ 1.3 MeV FWHM: 2.7 keV
High noise level at segment F4 (100 mV after Amp, without HV)
0
0,5
1
1,5
2
2,5
3
Core B1 C6 E1 F6
FW
HM
[ke
V]
59.6 keV 1332.5 keV Specification low energy Specification high energy
60 keV122 keV
Core 6 µs 1.5 1.6
3 µs 1.5 1.55
F4 6 µs 1.9
3 µs 1.87
Core 5000 V
FWHM:1.74 keV@ 122 keV
Segments of sector F grounded:
Core @ 1.3 MeV FWHM: 2.72 keV
C001 in new TU Munich cryostat delivered to Liverpool for scanning
Mean FWHM @ 60 keV: May 06: 1147 +/- 63 eVJan 08: 1083 +/- 61 eV
f6f1e6e1d6d1c6c1b6b1a6core a1
0
0,5
1
1,5
2
2,5
3
59.6 keV May 06 59.6 keV Jan 08 1332.5 keV May 06
1332.5 keV Jan 08 Specification low energy Specification high energy
Mean FWHM @ 1.3 MeV:May 06: 2.13 +/- 0.1 keVJan 08: 2.1 +/- 0.1 keV
Summary acceptance tests
B001 06/07 Padova Rejected - damage of contacts of segments A3 & C3
A002 06/07 München Accepted
C004 09/07 Ankara Accepted
A004 09/07 Ankara Rejected - low impurity concentration and/or trapping
A003 10/07 Liverpool Accepted
B004 12/07 Ankara Tested, not in specification
A005 12/07 Uppsala Test ongoing (Saclay & Cologne)
C005 12/07 Uppsala Test at Saclay
B005 12/07 Uppsala Test at Saclay
A004 07/08 Ankara Test at Cologne
Asymmetric AGATA Triple Cryostat
Mechanical precision of the end caps
bending under vacuum within tolerances
Exact positioning of the detectors inside the triple endcap
Spacing 0.5 mm
LN2 consumption
Thermal properties
HV box fits
Tripel Cluster 1 Energies: Single vs Triple cryostat
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1 F2 F3 F4 F5 F6
59,6 keV Single 59.6 keV Triple Specification low energy
0
0.5
1
1.5
2
2.5
3
Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1 F2 F3 F4 F5 F6
1332,5 keV Single 1332,5 keV Triple Specification high energy
A0
01
– F
WH
M [
keV
]B
00
2 –
FW
HM
[ke
V]
0
0.5
1
1.5
2
2.5
3
Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1 F2 F3 F4 F5 F6
1332,5 keV Single 1332,5 keV Triple Specification high energy
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1 F2 F3 F4 F5 F6
59.6 keV Single 59.6 keV Triple Specification low energy
0
0.5
1
1.5
2
2.5
3
Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1 F2 F3 F4 F5 F6
1332,5 keV Single 1332,5 keV Triple Specification high energy
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1 F2 F3 F4 F5 F6
59,6 keV Single 59,6 keV Triple Specification low energy
C0
02
– F
WH
M [
keV
]
Resolution 60keV line Resolution 1.33MeV line
Excellent energy resolution in new triple cluster
Mean values segments @ 60 keV :
A001 : 1011 +/- 53 eV
B002 : 1039 +/- 70 eV
C002 : 965 +/- 63 eV
especially at low energies (electronic noise):
- glued detector less microphonics
- HEKO AGATA preamp
- electronic assembly (grounding, cabling)
For any 1406keV single event in the detector:
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0 6 12 18 24 30 36
Hit segment number
Ba
selin
e S
hift
in A
1 (
keV
)
Cross talk : intro
A2..A6
B1 F1
Co
re to
se
g X
talk
= u
nd
erst
ood
!
Segment labeling:
Sectors: A...F
Rings: 1...6
X
A001 in Triple Cryostat 5000 V
-0,0025
-0,002
-0,0015
-0,001
-0,0005
0
0 200 400 600 800 1000 1200 1400
segment "i" + 36x segment "j"
Xta
lk a
mp
litu
de
s fr
om
se
g "
i" t
o s
eg
"j"
[%
]
Measured Cross talk
Core to Seg Xtalk (theory)
A2 B2
C2D2
E2 F2
Smallest capacities in ring 2
B002 in Triple Cryostat @ 5000 V
-0.25%
-0.20%
-0.15%
-0.10%
-0.05%
0.00%
0 200 400 600 800 1000 1200
segment "i" + 36x segment "j"
Xta
lk a
mpl
itude
s fro
m s
eg "
i" to
seg
"j"
[%]
Measured Cross talk
Core to Seg Xtalk (theory)
Smallest capacities in ring 2
A2
B2 C2 D2 E2 F2
C002 in Triple Cryostat @ 5000 V
-0,25%
-0,20%
-0,15%
-0,10%
-0,05%
0,00%
0 200 400 600 800 1000 1200
segment "i" + 36x segment "j"
Xta
lk a
mp
litu
de
s fr
om
se
g "
i" to
se
g "
j" [%
]
No cross talk between detectors in Triple Cryostat
-0.25%
-0.20%
-0.15%
-0.10%
-0.05%
0.00%
0.05%
0 200 400 600 800 1000 1200 1400 1600
-0.25%
-0.20%
-0.15%
-0.10%
-0.05%
0.00%
0.05%
0 200 400 600 800 1000 1200 1400 1600
-0.25%
-0.20%
-0.15%
-0.10%
-0.05%
0.00%
0.05%
0 200 400 600 800 1000 1200 1400 1600
A001 B002 C002
Co
re B
Co
re C
Co
re A
Co
re C
Co
re A
Co
re B
Sector A Sector F
Sector A Sector F Sector A Sector F
A00
1B
002
C00
2
Tripel Cluster 2 Energies: Single vs Triple cryostat
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
[A 0
03 -
FW
HM
]keV 59,6 keV Single 59,6 keV Triple Specification low energy
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
[B 0
03 -
FW
HM]k
eV 59,6 keV Single 59,6 keV Triple Specification low energy
Mean values segmens @ 60 keV :A001 : 1053 +/- 65 eVB002 : 995 +/- 73 eVC002 : 1149 +/- 105 eV
Resolution 60keV line
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
C0
04
- F
WH
M [
ke
V]
59,6 keV Single 59,6 keV Triple Specification low energy
preliminary
AGATA Triple Clusters: Summary and outlookAGATA Triple Cluster Detectors operational:-first triple: cryostat, mechanics, vacuum o.k. seg-preamps, core preamp & pulser o.k. energy resolution o.k. no cross talk between detectors second triple: commissioning phase
-
AGATA Triple Cluster Detectors operational:-first triple: cryostat, mechanics, vacuum o.k. seg-preamps, core preamp & pulser o.k. energy resolution o.k. no cross talk between detectors second triple: commissioning phase
-
Outlook: Demonstrator at Legnaro:
-- transport to Legnaro of ATC1 - in July 2008 -- assembly of third triple- constrained by available detectors
ATC2
ATC3
ATC1
Core pulser result: measurement of segment capacities in 1. triple
A001 5000 V
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
Ring 1 Ring 2 Ring 3 Ring 4 Ring 5 Ring 6
C [
pF
]
A
B
C
D
E
F
B002 5000 V
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
Ring 1 Ring 2 Ring 3 Ring 4 Ring 5 Ring 6
C [
pF
]
A
B
C
D
E
F
C002 5000 V
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
Ring 1 Ring 2 Ring 3 Ring 4 Ring 5 Ring 6
C [
pF
]
A
B
C
D
E
F