agata; status, plans and opportunities
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AGATA; status, plans and opportunities. John Simpson Nuclear Physics Group Daresbury Laboratory. Dr Andy Boston [email protected]. AGATA The A dvanced Ga mma Ray T racking A rray at Radioactive Ion Beam facilities. Introduction: The AGATA project - PowerPoint PPT PresentationTRANSCRIPT
AGATA; status, plans and
opportunities
John SimpsonNuclear Physics GroupDaresbury Laboratory
Dr Andy [email protected]
Introduction: The AGATA project
Current status of the AGATA; towards the “demonstrator”
Exploitation of AGATA; demonstrator and beyond
AGATA The Advanced Gamma Ray Tracking Array
at Radioactive Ion Beam facilities
Next generation -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
Experimental conditions and challenges
• Low intensity• High backgrounds• Large Doppler broadening• High counting rates• High -ray multiplicities
High efficiencyHigh sensitivityHigh throughputAncillary detectors
FAIRSPIRAL2SPESREX-ISOLDEEURISOLECOS
Need instrumentation
AGATAAGATA(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% 40%
Angular Resolution: ~1º FWHM (1 MeV, v/c=50%) ~ 6 keV !!!today ~40 keV
Rates: 3 MHz (M=1) 300 kHz (M
=30)today 1 MHz 20 kHz
• 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
The AGATA CollaborationMemorandum of Understanding 2003-07
Research and Development phaseBulgaria: 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
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 EDAQwith on line PSA and -ray trackingIn beam CommissioningTechnical proposal for full array
Cost ~ 6 M €
Ingredients ofIngredients of --TrackingTracking
Pulse Shape Analysisto decompose
recorded waves
Highly segmented
HPGe detectors
·
·
··
Identified interaction
points(x,y,z,E,t)i
Reconstruction of tracks
e.g. by evaluation of permutations
of interaction points
Digital electronicsto record and
process segment signals
1
2 3
4
reconstructed -rays
AGATA Detectors
Hexaconical Ge crystals90 mm long80 mm max diameter36 segmentsAl encapsulation
0.6 mm spacing0.8 mm thickness
37 vacuum feedthroughs
• Symmetric detectors– 3 delivered
• Asymmetric detectors– 15 ordered (4 accepted, 7 in 2007)
• Preamplifiers available– Core (Cologne); Segment (Ganil &
Milano)
• Test cryostats for characterisation– 3 delivered
– 2 ordered (1 delivered)
• Triple cryostats– 4 (soon 5) ordered
– 1st expected May 2007
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
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
Planning for 2007:
First asymmetric triple module in summer 2007
(In-beam) tests using “standard” digital electronics
AGATA Design and Construction
180 geometry definedConceptual design of 180 array doneDetails of HV etc. agreed, GSI testDesign of AGATA demonstrator for LNL final stagesFlanges manufacture startedAssembly in LNL, 2007
Characteristation and Scanning
Three symmetric capsules
scanned in Liverpool
Commissioning of further scanning systems
at Orsay and GSI
Scan of an asymmetric capsule in Liverpool
Scan of the 3rd symmetric capsule
662keV
374keV
288keV
Coincidence scan for 3D position determination
Comparison of real and calculated pulse shapes. Validate codes.
AGATA s002 & s003 comparison (prelim)
A
B
C
D
E
F
1 2 3 4 5 6
IGeometry
IIPotentialElec field
IIIDrift
velocities
IVWeighting
fields
AGATA symmetric crystal simulation
• Electric field simulations have been performed and details comparisons have been made with experimental pulse shape data.
Electric Field Simulations : MGS
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
Best resultγ detector, seg. mult. 1
Full dataset
Simulation
FWHM FWHM FWHM
Detector 32 keV 35 keV
Segment 11.1 keV 12 keV
PSA 4.8 keV 5.3 keV 5.0 keV
REACTION CHANNEL: (d,p)PsaSegDet
1382 keV
Results obtained with Grid Search PSA algorithm (R.Venturelli et al.)
Many different methods are under development
Segment level processing: energy, timeDetector level processing: trigger, time, PSAGlobal level processing: event building, tracking, software trigger, data storage
AGATA Digitiser Module 36+1 channels, 100 MhZ, 14 bits
(Strasbourg - Daresbury – Liverpool)
• Mounted close to the Detector 5-10 m
• Power Dissipation around400W
• Water Cooling required
• Testing in Liverpool
(December 2006)
• Production in progress
(for 18 modules)Prototype Segment Board
(2 boards per crystal)
• 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, 1 in possible in ~2011• Rate of construction depends on production
capability and financing• Stages of physics exploitation, facility
development
Status and Evolution
AGATA demonstrator at Legnaro
(2008-09)
5 triple clusters coupled to PRISMA Schematics of the mounting frame
holding (up to) 15 clusters
Peak efficiency3 – 8 % @ M = 1
2 – 4 % @ M = 30
AGATA demonstrator at Legnaro
Principal physics opportunities :
High-spin spectroscopy of moderately neutron-rich nuclei produced in deep-inelastic reactions
Good experience from CLARA + PrismaHeavy-ion beams from PIAVE + ALPIwith suitable intensities and energies
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
AGATA “post-demonstrator” array at GSI-FRS (~2010/11)
LYCCA
= 0 = 50 %
0
5
10
15
20
25
30
35
40
45
50
1 2
Effic
ien
cy (
%)
Solid Angle (%)
Efficiency M = 1
Efficiency M = 10
Efficiency M = 20
Efficiency M = 30
Forward Quadrant with 45 crystals in 15 triple-clusters
v/c = 0 v/c = 0.5
AGATA-15 at the GSI-FRSAGATA-15 at the GSI-FRS
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
AGATA web AGATA web pagepage
http://www.gsi.de/http://www.gsi.de/agata/agata/
Talks from last AGATA weekORSAY January 2007
http://www.csnsm.in2p3.fr/groupes/strucnuc/AGATAWEEK/agataweek.html
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