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AGATA Introduction

AGATA Introduction. John Simpson Nuclear Physics Group. The 4  180 detector Configuration. Ge crystals size: length 90 mm diameter 80 mm. 180 hexagonal crystals 3 shapes 60 triple-clusters all equal Inner radius (Ge) 23.1 cm Amount of germanium 362 kg

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AGATA Introduction

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  1. AGATA Introduction John Simpson Nuclear Physics Group

  2. The 4 180 detector Configuration Ge crystals size: length 90 mm diameter 80 mm 180 hexagonal crystals 3 shapes 60 triple-clusters all equal Inner radius (Ge) 23.1 cm Amount of germanium 362 kg Solid angle coverage 82 % Singles rate ~50 kHz 6480 segments Efficiency: 43% (Mg=1) 28% (Mg=30) Peak/Total: 58% (Mg=1) 49% (Mg=30)

  3. AGATA Detectors Hexaconical Ge crystals 90 mm long 80 mm max diameter 36 segments Al encapsulation 0.6 mm spacing 0.8 mm thickness 37 vacuum feedthroughs 3 encapsulated crystals 111 preamplifiers with cold FET ~230 vacuum feedthroughs LN2 dewar, 3 litre, cooling power ~8 watts

  4. The First Step:The AGATA DemonstratorObjective of the final R&D phase 2003-2008 1 symmetric triple-cluster 5 asymmetric triple-clusters 36-fold segmented crystals 540 segments 555 digital-channels Eff. 3 – 8 % @ Mg = 1 Eff. 2 – 4 % @ Mg = 30 Full ACQwith on line PSA and g-ray tracking

  5. 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 Core 1.2 keV at 60 keV and 2.1 keV at 1.3 MeV Cross talk less than 10-3

  6. AGATA Prototypes First triple cryostat in Cologne Full scan of first Detector in Liverpool

  7. Segment level processing: energy, time Detector level processing: trigger, time, PSA Global level processing: event building, tracking, software trigger, data storage

  8. 5 Clusters 1p 3p 55 Clusters 4p Array The Phases of AGATA-180

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