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AGATA Introduction
John SimpsonNuclear Physics Group
The 4 180 detector Configuration
180 hexagonal crystals 3 shapes60 triple-clusters all equalInner radius (Ge) 23.1 cmAmount of germanium 362 kgSolid angle coverage 82 %Singles rate ~50 kHz6480 segments
Efficiency: 43% (M=1) 28% (M=30)Peak/Total: 58% (M=1) 49% (M=30)
Ge crystals size:length 90 mmdiameter 80 mm
AGATA Detectors
3 encapsulated crystals111 preamplifiers with cold FET~230 vacuum feedthroughs
LN2 dewar, 3 litre, cooling power ~8
watts
Hexaconical Ge crystals90 mm long80 mm max diameter36 segmentsAl encapsulation
0.6 mm spacing0.8 mm thickness
37 vacuum feedthroughs
The First Step:The AGATA Demonstrator
Objective of the final R&D phase 2003-2008
1 symmetric triple-cluster5 asymmetric triple-clusters
36-fold segmented crystals540 segments555 digital-channels
Eff. 3 – 8 % @ M = 1
Eff. 2 – 4 % @ M = 30
Full ACQwith on line PSA and -ray tracking
AGATA Prototypes•Symmetric detectors
–3 ordered, Italy, Germany
–3 delivered
–Acceptance tests in Koln
–3 work very well First results very good:
36 outer contacts 0.9-1.1 keV at 60keV and 1.9-2.1 keV at 1.3 MeV Core1.2 keV at 60 keV and 2.1 keV at 1.3 MeV
Cross talk less than 10-3
AGATA Prototypes
Full scan of first Detector in Liverpool
First triple cryostat in Cologne
Segment level processing: energy, timeDetector level processing: trigger, time, PSAGlobal level processing: event building, tracking, software trigger, data storage
5 Clusters5 Clusters113355 Clusters55 Clusters44 Array Array
The Phases of AGATA-180