P. Reiter

Summary:
Detector module and Preamplifiers
• A. Wiens, IKP Cologne
• A. Goergen, CEA Saclay
• D. Quirion, Canberra
• G. Pascovici, IKP Cologne
P. Reiter IKP University Cologne AGATA week 8-11 July 2008 Uppsala

Detector Delivery Owner Status
A001* 11/2005 GANIL rejected – hole trapping
A001 06/2006 GANIL accepted
A002* 04/2006 TU Munich rejected – leakage currents
A002 06/2007 TU Munich accepted
A003* 11/2006 Liverpool rejected – leakage currents
A003 10/2007 Liverpool accepted
A004 09/2007 Ankara rejected – segments out of specification
A004* 07/2008 Ankara CAT at IKP, Cologne
A005 12/2007 Stockholm CAT at CEA, Saclay & IKP
B001* 11/2005 Padova rejected – segments out of specification
B001 06/2007 Padova rejected – leakage currents
B002 08/2006 GANIL accepted
B003 06/2007 Liverpool accepted
B004 12/2007 Ankara rejected – missing segment in capsule
B004* 06/2008 Ankara CAT at IKP, Cologne
B005 12/2007 Stockholm CAT at CEA, Saclay
C001 12/2005 Padova accepted
C002 07/2006 GANIL accepted
C003 03/2007 Liverpool accepted, broken, leakage currents
C004 09/2007 Ankara accepted
C005 12/2007 Stockholm CAT at CEA, Saclay

Summary customer 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 – six segments out of E specs
A003 10/07 Liverpool Accepted
B004 12/07 Ankara Rejected - missing segment
B004 06/08 Ankara Tested - not in specification
A005 12/07 Stockholm Test ongoing (Saclay & Cologne)
C005 12/07 Stockholm Test at Saclay
B005 12/07 Stockholm Test at Saclay
A004 07/08 Ankara Test at Cologne
• Detector tests since last AGATA week
•Tests are done at CEA, Saclay and IKP, Cologne

Summary available detector
Available detectors for AGATA triple clusters
A1, A2, A3
B2, B3
C2
Detectors for period fall and winter 2008/09
• 13 detectors may be available
A1, A2, A3, A4, A5, A6
B1, B2, B3, B4, B5, B6
C1, C2, C4, C5
• A6, B1, B6 delivery July 2008
• redelivery of turkish detectors A4, B4, C4
Future detectors
• January - June 2009 italian detectors C6, A7
• detector repair of C3
• summer 2008 order of german detectors A8, B7, C7

First AGATA triple cluster detector
IKP Cologne, H.-G. Thomas CTT Montabaur

A001 – FWHM [keV]
1.6
1.4
1.2
1
0.8
0.6
1.6
0.4
1.4
0.2
1.2
0
1
Tripel Cluster 1 Energies: Single vs Triple cryostat
59,6 keV Single 59.6 keV Triple Specification low energy
3
1332,5 keV Single 1332,5 keV Triple Specification high energy
2.5
2
1.5
Excellent energy resolution in new triple cluster
0.5
2.5
1
3
0
2
A1 A2A3A4A5A6
B1 B2B3B4B5B6
C1 C2C3C4C5C6
D1 D2D3D4D5D6
E1 E2E3E4E5E6
F1 F2F3F4F5F6
Core
A1 A2A3A4A5A6
B1 B2B3B4B5B6
C1 C2C3C4C5C6
D1 D2D3D4D5D6
E1 E2E3E4E5E6
F1 F2F3F4F5F6
1.5
1332,5 keV Single 1332,5 keV Triple Specification high energy
0.5
2.5
0
2
A1 A2A3A4A5A6
B1 B2B3B4B5B6
C1 C2C3C4C5C6
D1 D2D3D4D5D6
E1 E2E3E4E5E6
F1 F2F3F4F5F6
Core
A1 A2A3A4A5A6
B1 B2B3B4B5B6
C1 C2C3C4C5C6
D1 D2D3D4D5D6
E1 E2E3E4E5E6
F1 F2F3F4F5F6
Core
0.8
Core
0.6
1.6
0.4
1.4
0.2
1.2
0
1
59.6 keV Single 59.6 keV Triple Specification low energy
1.5
1
1332,5 keV Single 1332,5 keV Triple Specification high energy
0.5
0
A1 A2A3A4A5A6
B1 B2B3B4B5B6
C1 C2C3C4C5C6
D1 D2D3D4D5D6
E1 E2E3E4E5E6
F1 F2F3F4F5F6
Core
A1 A2A3A4A5A6
B1 B2B3B4B5B6
C1 C2C3C4C5C6
D1 D2D3D4D5D6
E1 E2E3E4E5E6
F1 F2F3F4F5F6
Core
0.8
0.6
0.4
0.2
0
Resolution 60keV line Resolution 1.33MeV line
Mean values segments @ 60 keV :
A001 : 1011 +/- 53 eV
B002 : 1039 +/- 70 eV
C002 : 965 +/- 1
3
63 eV
especially at low energies (electronic noise):
59,6 keV Single 59,6 keV Triple Specification low energy
- glued detector → less microphonics
- HEKO → AGATA preamp
- electronic assembly (grounding, cabling)

A001 in Triple Cryostat 5000 V
Measured Cross talk
Core to Seg Xtalk (theory)
0
0 200 400 600 800 1000 1200 1400
Smallest capacities in ring 2
Xtalk amplitudes from seg "i" to seg "j"
[%]
-0,0005
-0,001
-0,0015
-0,002
A2
B2
C2
D2
E2
F2
-0,0025
segment "i" + 36x segment "j"

No cross talk between detectors in Triple Cryostat
0.05%
A001 B002 C002
A001
0.00%
-0.05%
-0.10%
-0.15%
-0.20%
-0.25%
0 200 400 600 800 1000 1200 1400 1600
Sector A
Sector F
Sector A Sector F Sector A Sector F
Core B
Core C
0.05%
B002
0.00%
-0.05%
-0.10%
-0.15%
0 200 400 600 800 1000 1200 1400 1600
Core A
Core C
-0.20%
-0.25%
0.05%
C002
0.00%
-0.05%
-0.10%
-0.15%
0 200 400 600 800 1000 1200 1400 1600
Core A
Core B
-0.20%
-0.25%

AGATA Triple Clusters: Summary and outlook
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:
-- transport to Legnaro of ATC1
- in July 2008
-- assembly of third triple
- constrained by available detectors
ATC1
ATC2
ATC3

AGATA Core - upgraded front end electronics
‣ Upgraded Charge Sensitive Preamplifier
- new frequency compensation for Single & Dual Gain Core
‣ Reworked Dual Gain Core, reconfigurable:
- either Single or Dual; either LV-CMOS or LVDS
‣ Programmable Spectroscopic Pulser
- as a tool for self-calibrating energy, time, dead time, time
alignment, detector characterization etc.)
G. Pascovici for the AGATA Preamplifier- and Detector Group
F. Zocca, A. Puglia, D. Bazzacco

Conclusions
• very low noise, very wide dynamic
range charge-sensitive pre-amplifier
• spectroscopic range successfully extended
by more than one order of magnitude with
new TOT technique up to 180 MeV
• two modes of operations four sub-ranges:
0-5 (20) MeV and 5(20)-180 MeV
• very clean transfer function
improvement: ‘Dominant pole compensation’
• Programmable Spectroscopic Pulser