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 ajboston@liv.ac.uk

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?

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

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% 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 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

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

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

Ingredients of g-Tracking 4 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

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

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 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

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

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

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

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

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

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

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)

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

AGATA demonstrator at Legnaro 5 triple clusters coupled to PRISMA (2008-09) 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

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

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

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 = 0 b = 50 % v/c = 0 v/c = 0.5

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

Talks from last AGATA week More Information AGATA web page http://www.gsi.de/agata/ Talks from last AGATA week ORSAY January 2007 http://www.csnsm.in2p3.fr/groupes/strucnuc/AGATAWEEK/agataweek.html Please visit site Input to Juergen Gerl or Samit Mandel All AGATA sites linked together