EXOGAM2 + NEDA G. de France
EXOGAM2 Outline • Scientific Motivations for EXOGAM2 (/SP2 LoI) • Limits of EXOGAM • The technical proposal • Timescale, cost and manpower • Coupling EXOGAM2 and NEDA G. de France, GANIL
EXOGAM and the Neutron Wall • Proton drip line studies and N~Z nuclei: • Reaction mechanism studies using borromean nuclei (6,8He) • Rare eath nuclei in the A~130 region: superdeformed ground state • MED in A=58, T=1 triplet and charge symmetry breaking terms above 56Ni • T=0 pairing and a new coupling scheme below 100Sn Always need charged particle detection in addition to neutrons
EXOGAM2 Scientific Motivations (1) • Proton drip line studies and N~Z nuclei: • Self-conjugate systems and isospin symmetry • Structure around 100Sn • T=0 pairing • Location of the p-drip line • Spectroscopy beyond the drip line • Fundamental symmetry: • BR measurements to test the CVC hypothesis • Neutrino-less double beta-decay • Experiment: • Fusion evaporation or pair transfer reactions; require neutron and charged particle detection • Beta decay (DESIR): 94Ag, 98In, 100Mo
EXOGAM2 Scientific Motivations (2) • Shell structure of neutron-rich nuclei: • Evolution of effective nuclear interaction (monopole and multipole terms) • Quenching of known shell gaps/new ones • Collectivity/Onset of deformation • Shape phase transition and dynamical symmetries • Experiment : • 78Ni and 132Sn regions: adjacent odd isotones/isotopes populated in DIC in inverse kinematics (complementarity with LNL; with thick target experiments) • Require the coupling to a recoil spectrometer (VAMOS)
EXOGAM2 Scientific Motivations (3) • Shapes and « high-spin » spectroscopy: • Shapes and shape coexistence • Rotations vs vibrations • Collective modes with large neutron excess • New high rank symmetries • Jacobi shape transition • Experiment: • Low energy excitation spectra (yrast and non-yrast states); 0+ excited states; lifetimes; quadrupole moments; isomers (decay and rotational bands above) • Projectile Coulomb excitation; fusion evaporation; DIC;… • Need VAMOS at 0° and Gas Filled Mode; neutron and charged particle detectors
EXOGAM2 Scientific Motivations (4) • Collective modes: • From « pure » 2qp states to quadrupole or octupole collective states • At higher energy (few MeV above yrast): • properties of Giant Resonances like GDR • Damping mechanisms of collective modes • Charge equilibration time • Symmetry energy • Onset of chaos • Experiment: • Coulomb excitation of n-rich beams (Sr, Kr, Zr, Sn ) on light targets: fusion evaporation with n-rich beams (Kr, Xe, Sn) • Measurement of gamma-ray energies, strength and angular distribution • Need pure beam
EXOGAM2 Scientific Motivations (5) • Spectroscopy of heavy elements: • Identifying the s.p. orbitals involved in the configuration of these nuclei and their role • Collectivity on nuclei located around the small islands of deformation (centred around 254No and 270Hs). • The role of K-isomerism on “stability” in this mass region. • The angular dependence of the fission barriers. • Experiment: • Coulomb excitation of 254No • RDT following fusion evaporation • EXOGAM+VAMOS • High intensity stable beams
EXOGAM2 Limits of EXOGAM • PSA originally planned and needed (resolution) • Rate limitation (DT32, common dead time readout mechanism) • D-size VXI maintenance • GANIL context: • SIBs high intensity stable beams; inverse kinematics; fast beams… • RIBs fragmentation (fast beams) • SPIRAL2 context: • SIBs high intensity stable beams ; inverse kinematics • RIBs access; reliability; robustness • AGATA context: achievements • Need urgently an upgrade to realize the physics programme • New design specifications to cope with the identified constraints
The EXOGAM2 technical proposal Motivations and design specifications General architecture CSP connection box The NIM digitizer The Global Trigger and Synchronization DAQ Status EXOGAM2 technical proposalIntroduction
Motivations: Better g-ray location => digital electronics Dead time reduction => triggerless mode High counting rates => ADONIS method VXI issues (reliability, obsolescence, expertise) => NIM digitizer Design specifications: Parameters: - Inner: E6MeV (2.3keV@1.3MeV, Icr<50kHz), E20MeV, Time, Time Stamping - Outer: E6MeV, Emirror, T30, T60, T90 - BGO : Energy (range 20MeV, resolution 15%), Veto - CSI: Energy (range 20MeV, resolution 15%), Veto Counting rate and readout: - Maximum counting rate: 100kHz per crystal - Readout: about 60 Bytes per crystal => 6 MB/s per crystal 3 trigger modes: - Triggerless: Crystal parameters validation by inner discriminator - Event trigger: Event validation by EXOGAM multiplicity - Common dead time: Event validation by EXOGAM multiplicity and ancillary detectors signals Coupling EXOGAM2 with ancillary detectors: - Global Trigger System - AGAVA Design specs
Power 8 fast ADCs 14 bits, 100MHz FPGA Virtex 4 (or 5,6) Inspections Ethernet Slow Control Optical Link (ADONIS) GTS mezzanine Ethernet Gbit START/STOP General architecture Differential Preamplifiers 7 differential analog signals per crystal ICR < 100kHz per crystal Digitizer and processing 1 crystal / NIM board => 64 NIM boards 1 link per NIM board ( 2 Gb/s) KALMAN processing 16 clovers = 64 crystals 1 optical link per NIM board 1 link per NIM board ( 6 MB/s per crystal) Global Trigger and Synchronization DAQ 1 GTS supervisor and 16 GTS mezzanines Switch Ethernet
The GTS and synchronization GTS topoly GTS mezzanine • The GTS supervisor sources: • the 100 MHz common clock • the global 48 bits timestamps (clock and event counters) • the trigger fast commands (validation, reject, reset, calibration) • The GTS supervisor sinks: • - the local trigger requests • - the error notifications • The GTS mezzanine provides: • the clock, timestamps and trigger commands for the LLP carriers • the mechanism for tagging and storing the local trigger requests • the trigger matching algorithm • the mechanism for phase equalization at the nodes (LLPs, ADCs) • The GTS mezzanine routes: • - the tagged local trigger requests and LLP status to the GTS node The AGATA readout column The window based trigger matching: *At the time of the validation arrival (trigger input, from the current value of GTS clock the trigger latency is subtracted. http://agata.pd.infn.it/agata_gts.htm
Data acquisition system • Data Flow: • Parameters from the digitizers are merged into an Event Builder based on the Narval acquisition system. • Narval is currently used at GANIL • Slow Control: • It consists in doing the setup andthe monitoring of the digitizers and the GTS boards • The Slow Control Core connects boards and GUI; it acts asa server. • SOAP/XML network protocol and Web Service Description Language interface feature the communication between SCC and GUI. • Run Control: • - It controls and monitors the DAQ components • Actions such as Initialization, setup, start and stop are performed through the RC • The Run Control Core connects Data Flow componentsand GUI; it acts asa server • SOAP/XML protocol and WSDL interface feature the communication between RCC and GUI. • Analysis and calibrations tools: • - Tools are based on GANIL Root Utilities and Vigru visualization software
Future GANIL DAQ EXOGAM2 FEE NEDA VAMOS VXI MUST2 VXI Gigabit switch ~60 MB/sec Exogam Event builder Gigabit switch Event builder Event dispatcher Data Analysis Storage
Coupling EXOGAM-NEDASome basic specifications • High rates • digital electronics; sampling freq. • n-deficient nuclei => NEDA=Trigger/Ch. Part. = Veto or « tagger » • n-rich => NEDA=veto/Ch. Part. = Trigger • need to generate and accept trigger signal • Trigger or veto: need to identify a neutron in a huge gamma flux • PSA
EXOGAM2 Status of the collaboration • EXOGAM collaboration: GANIL, IN2P3 (CSNSM, IPNO), IRFU, KTH Stockholm, University of York, Liverpool, Surrey, Manchester, STFC Daresbury, JYFL, ATOMKI, GSI, Warsaw) • EXOGAM2 SPIRAL2-PP participants: GANIL, CNRS(LIST/DETECS/SSTM), CEA, STFC, U. of Liverpool, ATOMKI, GSI, INRNE • INFN • IUAC New Delhi • Mumbai • Krakow • ILL?
Finances and manpower requirements
EXOGAM2 Status of finances • 250 k€ France • 72 k€ from SP2-PP • 66 k€ from EXOGAM (UK, I, CEA) • 16 k€ from Sweden • 50 k€ CPER • 75 k€ ILL?? • 529 k€ in hands/promised • 30 k€ to be found (GTS cost reduction?)
Conclusions • Great physics case with EXOGAM+NEDA which also need a charged particle detction setup • EXOGAM2 is progressing: NUMEXO2, collaboration, funding,MoU • Issue: high rates (gammas) • PSA • Trigger flexibility: triggerless+data merging after pre processing or triggered systems • Time distribution => need a system which ensures: • Time stamping • Clock distribution • Trigger decision • True (at GANIL) for several SPIRAL2 detectors => synergies • Can we use/adapt EXOGAM2 electronics for NEDA? « a la GTS »
