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