Transcript The AGATA project

The AGATA project
Advanced GAmma Tracking Array
for g - ray spectroscopy under extreme conditions
in a very large energy range with high efficiency
and very good spectral respons
concept of g- ray tracking
design and development
Joint Resaearch Activity (EURONS)
Witek Męczyński
The Henryk Niewodniczański Institute of Nuclear Physics
Polish Academy of Sciences, Kraków, Poland
North-East European Network meeting, September 14– 15, Kraków
Concept of g- ray tracking
EUROBALL
limited det. efficiency;
poor en. resolution
at high recoil velocity
W
~ 0.4
MODEL
too many detectors
are needed to avoid
summing effects
W
~ 0.8
AGATA
W
~ 0.8
segmented detectors;
interaction points of all
g-rays are determined;
full energy of every
g-ray is reconstructed
Design and development
36-fold segmented Ge detector
Triple cluster module
hexagonal tapered shape
max. diam. 80 mm, length 100 mm
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
Tracking Algorithms use the results
of PSA for reconstruction
of the individual g-rays
1 - 3 encapsulated det. in a common
cryostat
2 - preamps
3 - frame support
4 - digital pulse procesing electronics
5 - fibre-optic channel for data transfer
6 - LN2 dewar
7 - target
AGATA 4p g- array
Array:
180 hexagonal crystals in 60 single clusters
12 pentagonal crystals individually canned
6 780 segments!
230 kg of high purity germanium
inner(outer) radius: 17(26) cm
solid angle coverage: 77 %
Major improvements in:
Efficiency (Eg=1 MeV): 50% (Mg=1) 25% (Mg=30)
Angular resolution: 1o
FWHM (1 MeV, v/c=50%): ~ 5 keV !
Rates: 3 MHz (Mg=1), 0.3 MHz (Mg=30)
Sensitivity: 107
Construction:
~ 8 years, completed in 2007/9
Cost ~40 M€, Effort ~150 MY
Joint Research Activity: objectives of the project
demonstration of the new technology with a small AGATA sub-array:
set of tracking modules
with
digital pulse-processing electronics,
data acquisition system
and
ancillary detectors
for performance evaluation
objectives of the project and the EU contribution:
development, construction,
commissioning and evaluation
of the prototype AGATA module
and associated electronics
starting date: January 1, 2005, duration: 4 years
Joint Research Activity: management of the project
41 institutions and laboratories from 11 European countries
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
Organisation of the AGATA project:
AGATA Steering Committee
AGATA Manegement Board
AGATA Working Groups
Poland
Detector Module
Local Level Processing
Global Level Processing
Design&Infrastructure
Ancillary Detectors
Data Analysis
EU Contact
Joint Research Activity: Polish contribution to the project
Institutions:
Heavy Ion Laboratory, Warsaw University
Institute of Experimental Physics, Warsaw University
The Andrzej Sołtan Institute for Nuclear Studies, Świerk
The H. Niewodniczański Institute of Nuclear Physics
Polish Academy of Sciences, Kraków
Working groups:
Global Level Processing
Data Analysis
Ancillary Detectors
Research team:
8 persons
Contributed effort:
6 men-years