1. AGATA; status, plans and opportunities
Introduction
Overview of the system
Physics outcomes from this meeting important
define physics case
experimental constraints
range of experiments
key experiments demonstrator/full array
meeting
Key design parameters Before too late
120/180 decision
John Simpson
Nuclear Physics Group
Daresbury Laboratory
Dr Andy Boston

2. AGATA The Advanced Gamma Ray Tracking Array
at Radioactive Ion Beam facilities
Introduction: The AGATA project
Current status of the AGATA; towards the “demonstrator”
Exploitation of AGATA; demonstrator and beyond
Next generation g-ray spectrometer based on gamma-ray tracking
First “real” 4 germanium array  no Compton suppression shields
Versatile spectrometer with very high efficiency and excellent spectrum quality for radioactive and high intensity stable beams
What is it?
Why tracking?

3. Experimental conditions and challenges
FAIR
SPIRAL2
SPES
REX-ISOLDE
EURISOL
ECOS
Low intensity
High backgrounds
Large Doppler broadening
High counting rates
High g-ray multiplicities
High efficiency
High sensitivity
High throughput
Ancillary detectors
Need instrumentation

4. AGATA (Design and characteristics) 4 -array for Nuclear Physics Experiments at European accelerators providing radioactive and high-intensity stable beams
Main features of AGATA
Efficiency: 43% (M =1) 28% (M =30)
today’s arrays ~10% (gain ~4) 5% (gain ~1000)
Peak/Total: 58% (M=1) 49% (M=30)
today ~55% %
Angular Resolution: ~1º 
FWHM (1 MeV, v/c=50%) ~ 6 keV !!!
today ~40 keV
Rates: 3 MHz (M=1) 300 kHz (M =30)
today MHz kHz
Summary
List few items
Agata very powerful instrument for nuclear spectroscopy
Exciting science programme subject of this meeting
Aim to propose and start realisation of the full AGATA from 2008
180 large volume 36-fold segmented Ge crystals in 60 triple-clusters
Digital electronics and sophisticated Pulse Shape Analysis algorithms allow
Operation of Ge detectors in position sensitive mode  -ray tracking

5. The AGATA Collaboration Memorandum of Understanding 2003-07 Research and Development phase
Bulgaria: Univ. Sofia
Denmark: NBI Copenhagen
Finland: Univ. Jyväskylä
France: GANIL Caen, IPN Lyon, CSNSM Orsay, IPN Orsay,
CEA-DSM-DAPNIA Saclay, IreS Strasbourg
Germany: GSI Darmstadt, TU Darmstadt, Univ. zu Köln, LMU München, TU München
Hungary: Debrecen
Italy: INFN and Univ. Firenze, INFN and Univ. Genova, INFN Legnaro, INFN and Univ. Napoli, INFN and Univ. Padova, INFN and Univ. Milano, INFN Perugia and Univ. Camerino
Poland: IFJ PAN Krakow, SINS Swierk, HIL & IEP Warsaw
Romania: NIPNE & PU Bucharest
Sweden: Chalmers Univ. of Technology Göteborg, Lund Univ.,
Royal Institute of Technology Stockholm, Uppsala Univ.
UK: Univ. Brighton, STFC Daresbury, Univ. Liverpool,
Univ. Manchester, Univ. Paisley, Univ. Surrey, Univ. York
Turkey: Univ. of Ankara, Istanbul University
Huge collaboration
Over 40 laboratories in 10 countries
Others joining, Turkey, Hungary

6. The First Step: The AGATA Demonstrator Objective 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 EDAQ with on line PSA and g-ray tracking
In beam Commissioning
Technical proposal for full array
Cost ~ 6 M €
Powerful array in its own right
Still to decide where to site
Still to decide the key test experiments

7. Ingredients of g-Tracking4 1
Identified
interaction points
Reconstruction of tracks
e.g. by evaluation of permutations
of interaction points
Highly segmented
HPGe detectors
(x,y,z,E,t)i g
Pulse Shape Analysis to decompose recorded waves 2 3
What has to be done to perform tracking
What are the ingredients
Detectors highly segmented, encapsulated, cryostats
Electronics Digital
PSA to extract Energy Time and Position
Algorithm development particularly for position
Area where effort is required Thorsten Kroell. See him.
Tracking algorithms, reconstruction of the events for full array
Obtain full energy
Many technical development in all areas.
Digital electronics
to record and process segment signals
reconstructed g-rays

8. AGATA Detectors Symmetric detectors Asymmetric detectors
3 delivered
Asymmetric detectors
15 ordered (4 accepted, 7 in 2007)
Preamplifiers available
Core (Cologne); Segment (Ganil & Milano)
Test cryostats for characterisation
2 ordered (1 delivered)
Triple cryostats
4 (soon 5) ordered
1st expected May 2007
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
The capsules
Status

9. AGATA triple-detector module
3 encapsulated Ge crystals in one cryostat
111 preamplifiers with cold FET
~230 vacuum feedthroughs
LN2 dewar, 3 litre, cooling power ~8 watts
First prototype summer 2005

10. AGATA triple-detector module
Planning for 2007:
First asymmetric triple module in summer 2007
(In-beam) tests using “standard” digital electronics
3 encapsulated Ge crystals in one cryostat
111 preamplifiers with cold FET
~230 vacuum feedthroughs
LN2 dewar, 3 litre, cooling power ~8 watts

11. AGATA Design and Construction
180 geometry defined
Conceptual design of 180 array done
Details of HV etc. agreed, GSI test
Design of AGATA demonstrator for LNL final stages
Flanges manufacture started
Assembly in LNL, 2007
Steps to the full array.
Capsule
triple cryostat
demonstrator
geometry full array
Support structure
Final realisation

12. Characteristation and Scanning
Comparison of real and calculated pulse shapes. Validate codes.
Coincidence scan for 3D position determination
Three symmetric capsules
scanned in Liverpool
288keV
374keV
662keV
Commissioning of further scanning systems
at Orsay and GSI
Scan of an asymmetric capsule in Liverpool
Scan of the 3rd symmetric capsule

13. AGATA s002 & s003 comparison (prelim)B C D E F 1 2 3 4 5 6

14. Electric Field Simulations : MGS
Electric field simulations have been performed and details comparisons have been made with experimental pulse shape data. I
Geometry II
Potential
Elec field
III
Drift velocities IV
Weighting fields
AGATA symmetric crystal simulation

15. Pulse-Shape Analysis: current status
Results from the analysis of an in-beam test with the first triple module,
e.g. Doppler correction of gamma-rays using PSA results
REACTION CHANNEL: (d,p)
1382 keV
Psa Seg Det
Best result
γ detector, seg. mult. 1
Full dataset
Simulation
FWHM
Detector
32 keV
35 keV
Segment
11.1 keV
12 keV
PSA
4.8 keV
5.3 keV
5.0 keV
Results obtained with Grid Search PSA algorithm (R.Venturelli et al.)
Many different methods are under development

16. Segment level processing: energy, time
Overview of the electronics and DAQ (first part)
May be out of date
Meeting on Wednesday of engineers to discuss details
So will say no more now
AMB approved design specifications
For digitizer
Pre-processing card
Trigger
DAQ scheme
DAQ meeting on Thursday, work packages, detailed specifications, PSA architecture, etc.
Segment level processing: energy, time
Detector level processing: trigger, time, PSA
Global level processing: event building, tracking, software trigger, data storage

17. AGATA Digitiser Module 36+1 channels, 100 MhZ, 14 bits (Strasbourg - Daresbury – Liverpool)
Mounted close to the Detector 5-10 m
Power Dissipation around 400W
Water Cooling required
Testing in Liverpool
(December 2006)
Production in progress
(for 18 modules)
Prototype Segment Board
(2 boards per crystal)

18. Status and Evolution Demonstrator commissioning at LNL late 2008
First physics campaign at LNL in 2009
further proposals from GANIL, GSI
LoI for construction phase signed in 2005
to allow bids for new funds from 2006 (D, I)
MoU for AGATA construction from 2008
Start completion in 2008, 1p in possible in ~2011
Rate of construction depends on production capability and financing
Stages of physics exploitation, facility development

19. AGATA demonstrator at Legnaro 5 triple clusters coupled to PRISMA
( )
5 triple clusters coupled to PRISMA
Schematics of the mounting frame holding (up to) 15 clusters
Peak efficiency
3 – 8 % @ Mg = 1
2 – 4 % @ Mg = 30

20. AGATA demonstrator at Legnaro
Principal physics opportunities :
High-spin spectroscopy of
moderately neutron-rich nuclei
produced in deep-inelastic reactions
Good experience from CLARA + Prisma
Heavy-ion beams from PIAVE + ALPI
with suitable intensities and energies

21. AGATA demonstrator at GANIL (~2010/11)
Main physics opportunities:
Spectroscopy of heavy elements towards SHE
Gamma-ray spectroscopy of neutron-rich nuclei populated in Deep Inelastic Reaction (with the GANIL specific aspects)
Gamma-ray spectroscopy with reactions at intermediate energies (up to 50 A.MeV)
Classical high-spin physics and exotic shapes
Range of beams, fragmentation, SPIRAL, direct beam line

22. AGATA “post-demonstrator” array at GSI-FRS (~2010/11)
LYCCA

23. Forward Quadrant with 45 crystals in 15 triple-clusters
AGATA-15 at the GSI-FRS
Forward Quadrant with 45 crystals in 15 triple-clusters
b = b = 50 %
v/c = 0
v/c = 0.5

24. AGATA “post-demonstrator” at GSI-FRS “Test Bench” for HiSpec (~2011)
Main physics opportunities:
Gamma-ray spectroscopy with reactions
at relativistic energies (> 50 A.MeV)
Coulomb excitation, few nucleon removal etc.
with slowed-down beams (10-20 A.MeV)
direct reactions, inelastic scattering

26. Talks from last AGATA week
More Information
AGATA web page
Talks from last AGATA week
ORSAY January 2007
Please visit site
Input to Juergen Gerl or Samit Mandel
All AGATA sites linked together