the agata project concept of - ray tracking design and development witek męczyński the henryk...
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The AGATA project
concept of - ray tracking
design and development
Witek Męczyński
The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
North-East European Network meeting, September 14– 15, Kraków
Joint Resaearch Activity (EURONS)
Advanced GAmma Tracking Array
for - ray spectroscopy under extreme conditionsin a very large energy range with high efficiency
and very good spectral respons
Concept of - ray tracking
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EUROBALL
MODEL
AGATA
limited det. efficiency;poor en. resolution
at high recoil velocity
too many detectors are needed to avoid
summing effects
segmented detectors;interaction points of all -rays are determined;
full energy of every -ray is reconstructed
Design and development
36-fold segmented Ge detector Triple cluster module
encapsulated in Aluminium can
Position sensitivity obtained by Pulse Shape Analysis of the real
signal from a segment and induced signals in its neighbours.
Position determination in 3D: < 5 mm
1 - 3 encapsulated det. in a common cryostat2 - preamps3 - frame support4 - digital pulse procesing electronics5 - fibre-optic channel for data transfer6 - LN2 dewar7 - target
hexagonal tapered shapemax. diam. 80 mm, length 100 mm
Tracking Algorithms use the results of PSA for reconstruction
of the individual -rays
AGATA 4- array
Sensitivity: 107
180 hexagonal crystals in 60 single clusters
Major improvements in:
12 pentagonal crystals individually canned6 780 segments! 230 kg of high purity germaniuminner(outer) radius: 17(26) cmsolid angle coverage: 77 %
Efficiency (E=1 MeV): 50% (M=125%
(M=30)Angular resolution: 1o
FWHM (1 MeV, v/c=50%): ~ 5 keV !
Rates: 3 MHz (M=1), 0.3 MHz
(M=30)
~ 8 years, completed in 2007/9
Array:
Cost ~40 M€, Effort ~150 MY
Construction:
Joint Research Activity: objectives of the project
demonstration of the new technology with a small AGATA sub-array:
objectives of the project and the EU contribution:
development, construction, commissioning and evaluationof the prototype AGATA moduleand associated electronics
set of tracking modules withdigital pulse-processing electronics,data acquisition systemand ancillary detectors for performance evaluation
starting date: January 1, 2005, duration: 4 years
Joint Research Activity: management of the project
Memorandum of Understanding: to develop, fund, construct and operate an AGATA demonstratrion array to form a research network to investigate novel aspects of nucl. structure
41 institutions and laboratories from 11 European countries
Organisation of the AGATA project:
AGATA Steering Committee AGATA Manegement Board AGATA Working Groups
Detector ModuleLocal Level ProcessingGlobal Level ProcessingDesign&InfrastructureAncillary DetectorsData AnalysisEU Contact
Poland
Joint Research Activity: Polish contribution to the project
Heavy Ion Laboratory, Warsaw University
Research team:
The H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Kraków
Global Level ProcessingData AnalysisAncillary Detectors
Institute of Experimental Physics, Warsaw University
The Andrzej Sołtan Institute for Nuclear Studies, Świerk
Institutions:
Working groups:
8 persons
Contributed effort: 6 men-years