The AGATA Demonstrator at LNL:
Status of the installation and
scientific programme.A.Gadea CSIC-IFIC / INFN-LNL
on behalf of E.Farnea (new local responsible)
and the AGATA Collaboration
The AGATA DemonstratorObjective of the final R&D phase 2003-2008
1 symmetric triple-cluster5 asymmetric triple-clusters
15 ×36-fold segmented crystals540 segments
555 high resolution digital-channels
Eff. 3 – 8 % @ Mg = 1
Eff. 2 – 4 % @ Mg = 30
Operate in real time ACQ,Pulse Shape Analysis and
ray Tracking
Hosting sites: LNL 2008 GANIL 2010 GSI 2012
The AGATA Demonstrator performance figures
AGATA radius 23.5 cm
AGATA D. LNL13.5 cm
AGATA radius 23.5 cm
AGATA D. LNL13.5 cm
MC simulations by
E.Farnea
2008 LNL6TC
2010 GANIL/SPIRAL≥8TC
2012 GSI / FRS ~15TC
AGATA D. + PRISMA AGATA D. + VAMOS
AGATA Demonstrator Experimental Program
AGATA D. @ FRS
Eff (%)vs. distance
AGATA radius 23.5 cm
AGATA D. LNL
13.5 cm6%
0
5
10
15
20
25
30
35
40
45
50
1 2
Effi
cie
ncy
(%
)
Solid Angle (%)
Efficiency M = 1
Efficiency M = 10
Efficiency M = 20
Efficiency M = 30
= 0 = 0.5
AGATA D. ≥8TCEXOGAM 8 seg. Clovers
Total Eff. > 10% Setup works also as
Compton Polarimeter
Schematics of the mounting frame with 15
triple clusters
AGATA Demonstrator – PRISMA
PRISMA: large acceptance spectrometer for binary
reactions
Installation of the AGATA Demonstrator at LNL
Currently: Installation of basic infrastructures at LNLJuly: Installation & start commissioning DSSJuly-August: first tests with first AGATA TC
AGATA Demonstrator mechanics: from the AGATA Flange to the full structure.
(Design: STFC Daresbury, Construction: INFN-Padova, Milano, LNL)
Very strict tolerances for construction and mounting.(STFC)
3 mounting attempts and 2 survey expeditions to reach
acceptable tolerances
STFC Laser Tracker
AGATA Demonstrator support frame.
(Design: STFC Daresbury, Construction: INFN-LNL and
Padova,)
Base and Intermediate frames
Flange shell Frame
Flange shell Frame with LN2 Bracket
Mounting the Flange shell in the Frame. (STFC Daresbury, INFN-Padova, Milano, LNL, GANIL)
Flange Shell Mounting Survey Results (STFC Daresbury, INFN-Padova, Milano, LNL, GANIL)
Model with the projection lines to the center
Before mounting the shell in the frame: all points within 0.4 mm
After mounting the shell in the frame: all point within 0.5 mm
Full support structure aligned to reaction chamber and target
position
AGATA Demonstrator cryogenic infrastructures (INFN-LNL and INFN-Padova)
Distribution and collector manifolds
of-line tested, installed in the LN2 cryogenic
line and commissioned.
AGATA Demonstrator cryogenic infrastructures (INFN-LNL and INFN-Padova)
Evacuation line and evaporator for the LN2 overflows:
problems solved, all parts mounted and tested.
DSS, Electronics and DAQ Infrastructures (LNL, Padova, CSNSM, IPNO, IPHC, Saclay, Daresbury, Liverpool, GSI, Jyvaskyla)
75m Optical fibresPre-
processing
PSA and DAQ
DetectorsOn-board DSS &
Digitizers
Infrastructure installation
ongoing
Design Engineer: Rob GriffithsProject Engineer: John Strachan
STFC Daresbury Laboratory
DEMOSTRATOR-PRISMA AXIS
BEAM AXIS
Angular Range For The AGATA DEMONSTRATOR- PRISMA
Setup
Distance target-AGATA ~14cm (efficiency ~6%)
58° to 130° fix 37° and 0°
Distance target-AGATA ~23cm (efficiency ~3%)
38° to 130°fix 21° and 0°
AGATA Demonstrator – PRISMA reaction chamber and beam-line.
(Construction: INFN-Milano, LNL)
Telescopic Beam-line Low absorption
reaction chamber
Ready to host DANTEExpansion Beam-Dump
AGATA Demonstrator at PRISMA
Next in programme for the installation• July
• installation of cooling manifold in the Digitizer racks• final arrangement of optical fibers and cables • test of the DSS Low Voltage power supply prototype• Installation of the security appliances of the setup• test of the DSS Power Supply and Autofill controls• test on-site with the AGATA Digitizers• installation of DAQ will continue• probable arrival of the first TC to LNL
•August-September• test of the detector mounting mechanics (to be programmed)• commissioning DSS
•October• first on-site electronics + DAQ test
AGATA DEMONSTRATIONAGATA DEMONSTRATION
Pulse Shape Analysisto de-convolute the
recorded wavesDAQ PSA - FARM
Highly segmented HPGe detectors
NOVEL PRE-AMPSIdentified
interaction points
(x,y,z,E,t)i
Reconstruction of interaction tracks
(tracking algorithms on interaction points)
DAQ TRACKING-FARM
Synchronized digital electronics
record and process the segment signals
DIGITIZERS +PRE-PROCESSING
On-line reconstruction of -rays
Commissioning Preliminary Plan (next plenary session!)
- Phase 0: commissioning with radioactive sources starting when detectors and electronics are available (even partially).- Phase 1: easy test with tandem beams with no ancillary detectors. Radiative capture or fusion-evaporation reactions with light targets in inverse kinematics.- Phase 2: test with a “simple” ancillary detector with limited number of parameters (DANTE). Coulomb excitation reactions with medium mass beams (A<100) in inverse kinematics.- Phase 3: test with PRISMA with multi-nucleon transfer reactions and at high multiplicity with appropriate ancillaries.
The earliest possibility to run in-beam tests is Dec.2008
neutrons
pro
tons
Neutron drip-line
Proton drip-line
More than 20 LoI:Highly Excited Collective Modes.Proton rich mirror nuclei populated by transfer reactions.Superdeformed states in A~40 proton-rich nuclei.
Evolution of collectivity and Dynamical Symmetries in the rare earthsMix-symmetry statesQuenching of the N=82 shell gap in n-rich nucleiN=50 shell gap: lifetime, and excited statesSpectroscopy and lifetimes in the new region of deformation n-rich A~60, N~40 nucleiLifetimes in the region of the island of inversion
Scientific programme: Grazing reactions transferring several nucleons: evolution of magic numbers and collectivity in n-rich nuclei, but not only...
Order-Chaos transition in Warm rotating nuclei.
Exotic beams
-arrays
PHASE SPACE Spin,
Temperature, Isospin
2
3
1
1 Warm Rotation 2 Giant Resonances
3 Pygmy resonances
Collective modes in the continuumCollective Rotation - Order-to-Chaos Transition CN reactions and Deep-Inelastic collissionsCollective Vibrations- Prompt dipole emission CN reactions- Highly excited/Pygmy states in n-rich nuclei Deep-Inelastic Collisions- Giant Quadrupole Resonance Inelastic Scattering
G. Benzoni, N. Blasi , A. Bracco, S. Brambilla, F. Camera, A. Corsi, F.C.L. Crespi, S. Leoni, B. Million, D. Montanari, O. Wieland, et al.
N=20,N=50 and N=82 Shell GapsN=20: 32Mg Island of inversion (due to residual
interaction)
T. Otsuka et al., PRL 95, 232502 (2005)
GXPF1 interaction
neutrons in g9/2
Contribution of tensor interaction to the monopole
term in N=20, 50 and 82
B(E2): GANIL, RIKEN, REX-
ISOLDE, NSCL
Tensor interaction between Tensor interaction between proton and neutron orbitalsproton and neutron orbitals
C.Petrache, et al., E.Sahin, et al., R.Chapman et al., G. Duchêne et al., F.Azaiez et al., A.Gadea et al.
New magic numbers and shape evolution
J.J.Valiente-Dobón et al., D.Mengoni et al., S.M.Lenzi et al., A. Görgen et al.,A.D.M.Cullen et al.,
f7/
2
f7/2p3/2 32
40
p1/2f5/2
g9/2
Shell evolution produces new magic numbers and regions of deformation:
N=32 shell closure for Z~20, N40 Z<28 transitional and deformation
Shape evolution in nuclei Z>28 with 40<N<50
Symmetries and shape phase-transitions
F. Iachello, Phys. Rev. Lett. 85 (00)3580,
Phys. Rev. Lett. 87 (01) 052502
134Ba 152Sm
O. Möller et al., N. Pietralla etal., D.Tonev et al., J.Nyberg et al., J.J.Valiente-Dobón et al.
Critical point symmetries in neutron-rich nuclei.
Evolution of symmetries/shapes with angular momentum.
Shape stability for axial rotors. Mixed-symmetry states.
pro
tons
neutrons
High-spin and exotic shapes
A. Maj, P. Napiórkowski, F. Azaiez et al., J. Ollier, N. Pietralla et al., J.Simpson et al., J. F. Smith et al., A. Görgen et al.,
•Highly collective rotational structures (equivalent to SD) in light nuclei populated by coulex.
•Exotic deformations in actinide nuclei.
•Quadrupole measurements / Shape identification
Superdeformation Hyperdeformation in n-rich nuclei. Interplay between singe-particle and collective degrees of freedom.
•Quadrupole – octupole collectivity
IC Range [a.u.]IC
Ene
rgy
[a.u
.] Z
A/q
v [a.u.]
IC E
nerg
y [a
.u.]
q
TRUE RECOIL VELOCITY+ TRAJECTORY IN DIPOLE+ TOTAL ENERGY
MCP-MWPPAC TOF=0.5 ns
5‰ Energy resolution
Tracking on PRISMA
v/cTARGET
LIKE
BEAM LIKE
DIPOLE
MCP Start Detector
IONIZATION CHAMBER
MWPPAC
A
S.Beghini et al. NIM A551, 364 (05) G.Montagnoli et al. NIM A547, 455 (05)
true recoil velocity
trajectory in dipole
AGATA Demonstrator at PRISMA
Efficiency at 1MeV: ~6% at 14cm Peak/Total: ~50% Angles covered: from ~135o to 180o FWHM, ~10%, 1MeV: <4 keV
FWHMCLARA ~7 keVAD 24 ~2.6 keVAD 14 ~3.3 keV
v/c distribution
~ 8.9%
E= 1 MeV
Simulation with full PRISMA reconstruction
by E.Farnea
Differential RDDS Measurement in the 48Ca
region with CLARAD.Mengoni, J.Valiente,
A.Gadea, A.Dewald
Differential Plunger for angles ≠ 0o
v'v
48Ca 310MeV +
208Pb (1mg)Degrader 4mg
Mg
Comparison between the Diff.plunger lifetime experiment performed with CLARA and with the AGATA D.
48Ca 310MeV + 208Pb
d=2200m
d=1240m
d=300m
Complete CLARA-PRISMA
M-C simulation by D.Mengoni
Plunger – AGATA 14cm
FWHM ~ 6 keV
FWHM ~ 3.5 keV
After DegraderBefore
Degrader
T1/2 ~100ps
Outlook:
•LNL is doing a consistent effort to have the acceleration complex upgraded for the arrival of the AGATA Demonstrator (AD). A new ECR source is presently being installed .•The basic infrastructures for AD will be completed by summer 2008 and, the first tests with an AGATA TC are expected between summer and October.•For the physics campaign, following the Demonstration, the AD will provide experimental capabilities beyond CLARA.•Installation only possible with all the AGATA collaboration working groups, THANK YOU!
Some expected beams in 2009
Ion mass charge m/q E M (Mev/A) I targ (pnA)
Ar 40 9 4,44 13,3 60Zn 70 13 5,38 9,6 46Kr 86 17 5,06 10,1 17Sn 124 20 6,20 8,1 10Xe 136 26 5,23 9,9 19Au 197 28 7,04 6,6 21Pb 208 30 6,93 6,7 3,3