AGATA: Advanced Gamma Tracking Array

MANY APOLOGIESJohn Simpson

Nuclear Physics GroupDaresbury Laboratory

AGATA WEEK SUMMARY and STATUS

Presented by:

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

Next generation -ray spectrometer based on gamma-ray tracking

4 germanium array no Compton suppression shields

Versatile spectrometer with very high efficiency and excellent spectrum quality for radioactive and high intensity stable beams

AGATAAGATA(Design and characteristics)

4 -array for Nuclear Physics Experiments at European accelerators providing radioactive and 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. Edinburgh, Univ. Liverpool, Univ. Manchester, Univ. Paisley, Univ. Surrey, Univ. York

Turkey: Univ. of Ankara, Istanbul University

 

AGATA Management Board

J.Simpson (Project Manager)

D.Bazzacco, G.Duchêne, P. Reiter, A.Gadea, J.Nyberg, Ch. Theisen

AGATA Steering Committee

G.deAngelis, A.Atac, F. Azaiez, D.Balabanski, D.Bucurescu, B.Cederwall,J. Gerl, J.Jolie, R.Julin, W.Meczynski,, M.Pignanelli, G.Sletten, P.M.Walker

Chairperson: W.Korten (and EURONS) Vice Chairperson: P.J. Nolan

AGATA Working Groups

AGATA Teams

Data analysisO.Stezowski

MechanicalIntegration

J. Valiente Dobon

PSAR.Gernhaeuser/P.Desesquelles

Gamma-rayTracking

A.Lopez-Martens

Elec. and DAQintegration

P. Bednarczyk

Mechanical designJ.Strachan

DigitisationP.Medina

Data acquisitionX.Grave

Detector and Cryostat

B Bruyneel

Detector data base

K.Hauschild

Impact on performance

M.Palacz

R & D on gammaDetectorsD.Curien

Global clock and Trigger

M.Bellato

Detector Characterisation

A.Boston

Physics & exp. simulationE.Farnea

Devices for key Experiments

N.Redon

InfrastructureP.Jones

Pre-processingI.Lazarus

Run Control & GUI

G.Maron

PreamplifiersA.Pullia

Simulation andData Analysis

J.Nyberg

Ancillary detectors

and integrationA.Gadea

Design andInfrastructureG. Duchêne

Front-endProcessingD.Bazzacco

Detector moduleP.Reiter

DataAcquisitionCh. Theisen

The AGATA OrganisationThe AGATA Organisation(Many thanks to everybody) (Many thanks to everybody)

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 € Capital

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 deliveredAsymmetric detectors

– 17 ordered (6 accepted, 4 in test, 7 in 2007/8)

Preamplifiers available

– Core (Cologne); Segment (Ganil & Milano)

Test cryostats for characterisation

– 5 deliveredTriple cryostats

– 4 (soon 5) ordered

– 1st being assembled November 2007

AGATA triple-detector module

First prototype summer 2005 3 encapsulated Ge crystals in one cryostat

111 preamplifiers with cold FET~230 vacuum feedthroughs

LN2 dewar, 3 litre, cooling power ~8

watts

Plans for 2007:

First asymmetric triple module being assembled now

Source and possibly in-beam tests using “standard” digital electronics

AGATA triple-detector module

AGATA Design and Construction

180 geometry definedConceptual design of 180 array doneSpecifications of infrastructure parts doneDesign of AGATA demonstrator for LNL final stagesFlanges manufacture startedAssembly in LNL, 2007

Characteristation and Scanning

Two symmetric capsules

scanned in Liverpool

Commissioning of further

scanning systems

at Orsay and GSI

Scan of an asymmetric capsule

in Liverpool: A PRIORITY

Scan of the 3rd symmetric capsule

662keV

374keV

288keV

Coincidence scan for 3D position determination

Comparison of real and calculated pulse shapes. Validate codes.

Pulse-Shape Analysis: current statusResults from the analysis of an in-beam test with the first triple module,

e.g. Doppler correction of gamma-rays using PSA results

d(48Ti,p)49Ti, v/c ~6.5%

Results obtained with Grid Search PSA algorithm (R.Venturelli et al.)

Position resolution ~4.4mm

Many different methods are under development

Implementation decision?

1340 1360 1380 1400 1420

energy [keV]

0

5000

10000

15000

20000co

unt

s pe

r ch

ann

el

PSA fwhm 5 keV

E = 1382 keV

SegmentDetector fwhm 13 keV

fwhm 32 keV

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)First production digitizer at Daresbury

Pre-processing modules (E,T, hits, …)

• Prototypes tested in 2006

• Core digitizer to core mezzanine and carrier communication errors

• Redesign of carrier (from Nov06)

• Redesign of mezzanines (from Dec06)

• New cards under test

• Good results so far

1 ATCA crate for 2 clusters(6 Ge crystals, 222 channels)

ATCA standard :“full mesh” communication with Gbit Ethernet or PCIexpress switches

Timescales for the AGATA demonstrator

Six years research and development phase of AGATAStart January 2003 ― End December 2008

• First three symmetric Ge crystals delivered in 2004

• First triple module tested in-beam in summer 2005

• Two symmetric crystals scanned for PSA by end 2006 • First electronics prototypes delivered in summer 2006• Five asymmetric Ge crystals delivered by end 2006

• First scan of asymmetric crystals planned autumn 2007• First AGATA triple module ready by autumn 2007• Second generation electronics prototypes by autumn 2007 • Commissioning of first full electronics chain in spring 2008 • Commissioning of sub array at Legnaro from autumn 2008

First physics campaign at LNL in 2009 Next campaigns at GANIL then GSI

MoU for AGATA construction from 2008Aim 1 in possible in ~2011Rate of construction depends on production capability and financingStages of physics exploitation, facility development

Status and Evolution

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

More Information

The Management

Thanks