Transcript Diapositive 1

The DESIR low energy beam facility at SPIRAL2
Decay, Excitation and Storage of Radioactive Ions
http://www.cenbg.in2p3.fr/desir
Collaboration promoting ISOL beams at SPIRAL2
Spokes-person: B. Blank, Bordeaux; [email protected]
GANIL liaison: J.-C. Thomas, Caen; [email protected]
DESIR @ SPIRAL2
 Beam preparation
 The DESIR Facility (building and equipments)
 Cost estimates / Synergies / Milestones
J.-C. Thomas, GANIL
3rd LASPEC-MATS workshop, 9-10 October 2008, Matalascañas, Spain
Why a low energy beam facility at SPIRAL2 ?
 Different production modes considered
 n-induced fission -> neutron-rich nuclei
 fusion reaction -> Superheavy, n-deficient nuclei (+ refractory
elements)
 fragment products at low-energy -> light exotic nuclei
 Large variety and high degree of purity for exotic beams
 all kind of ionization sources (including laser ionization)
 high-efficiency RFQ cooler/buncher + high-resolution mass
separator
N
F
S
SPIRAL2 layout
LINAG
Fusion reaction
14 A.MeV A/Q=3 HI, 1 mA
S3
DESIR
Level 0
15 m
Level -1
n-induced 238U fission
40 MeV 5 mA deuterons
1014 fissions/s
Fragmentation + ISOL
95 A.MeV 36Ar 3 kW
Production building
GANIL/
SPIRAL
RFQ and HRS cave in the production building
8m
Production building
Legend:
SHIRaC
12m
Electronics
Quadrupole
RFQ
Sextupole
storage and
maintenance
Multipole
Dipole
SHIRaC
SPIRAL2 High Intensity Radiofrequency Cooler
Prototype RFQ linear Paul trap, work initiated at CSNSM Orsay (D. Lunney)
Under development at LPC Caen (G. Ban, F. Duval)
Goals: High-voltage (20 kV), high frequency (20 MHz) linear radiofrequency quadrupole trap for strong confinement of mA
beams; should deliver beams with 1 p.mm.mrad emittance
Results so far: Prototype tested at high-current separator
SIDONIE (Orsay)
O. Gianfrancesco et al., Proc. EMIS2007
High resolusion mass separator
 symmetric design, inspired by the CARIBU HRS at ANL:
with two magnetic dipoles (D)
six quadrupoles (Q)
two sextupoles (H)
one multipole (M)
combined as QQHQD M DQHQQ
 minimized aberrations, large mass dispersion
 expected performances : M/DM ~ 2.104 for a 1 p.mm.mrad at 10 to 60 keV
Beam profile in x-direction
Suggested layout
T. Kurtukian-Nieto, CENBG
Identification
station with Beam
tape
Laser
room
(mezzanine)
from S3
Level 0
DESIR layout – level 0
LUMIERE
BESTIOL
MLL trap
Control
room
Beam from
Production building
Level -1
Gas &
waste
storage
RFQ
buncher
LN2
DAQ
room
Level -1
Beam from SPIRAL1
Crane access
to basement
5m
Electronics
Desk
Access
Workshop
free
free
Assembly
Room 3
Gray
Room 1
HV
free
Supply
Beam from
Production building
DESIR layout - Level -1
supplies
Gray ElectriRoom 2 city
Storage 2
Storage 1
Assembly Assembly
Room 1
Room 2
Control
Racks
Interfaces
Beam from SPIRAL1
Crane access
to basement
5m
Limits
DESIR hall
LUMIERE
Laser Utilisation for Measurement and
Ionization of Exotic Radioactive Elements
• Collinear Laser spectroscopy:
- spins
- magnetic moments
- quadrupole moments
- change of charge radii
F. Le Blanc ,Orsay
G. Neyens, Leuven
P. Campbell, Manchester
• b-NMR spectroscopy:
- nuclear gyromagnetic factor
- quadrupole moment
N=50, N=64, N=82, …
• Microwave double resonance in a Paul trap:
- hyperfine anomaly and higher order momenta (octupole and hexadecapole
deformation)
Eu, Cs, Au, Rn, Fr, Ra, Am ….
BESTIOL
BEta decay STudies at the SPIRAL2 IsOL facility
• Decay studies with halo nuclei
M.J.G. Borge, Madrid
• Clustering studies in light nuclei
• b-delayed charged-particle emission: e.g. proton-proton correlation
• Super-allowed b decays and the standard model of electro-weak interaction
• Deformation and Gamow-Teller distribution
• 2n correlations, Pn and nuclear structure (r-process)
• ...
b-g setup, B. Blank (Bordeaux)
TAS, B. Rubio (Valencia)
TETRA, Y. Penionzhkevich (Dubna)
MLLTRAP
P. Thirolf , Munich
•High-accuracy mass measurements
- unitarity of CKM matrix (Vud): 50Mn, 54Co with DM/M~10-10
- transuranium isotopes (beams from S3): M(Z>102)
• In-trap spectroscopy:
- conversion electron and a spectroscopy: shape coexistence
• Trap-assisted spectroscopy
- b decay studies of isomerically pure radioactive species
Set-up being installed
at MLL/Garching
KVI atomic trapping facility
H. Wilschut, Groningen
• New
limits on scalar and tensor contributions in the weak interaction
• New limits on time-reversal violation in beta decay
• Systematic of atomic parity non-conservation in a long isotopic chain
Experimental set-up at KVI
DESIR building costs
Infrastructure
Estimated costs
Available funds
6000 k€
2000 k€ (CPER)
RFQ
320 k€
320 k€ (CPER)
HRS
1000 to 1500 k€
-
3600 k€
-
DESIR building
beam lines
RFQ + off-line sources
Total (preliminary)
200 k€
11000 to 16000 k€
Equipments foreseen at DESIR
Collinear laser spectroscopy:
b-NMR setup:
Leuven
100 k€
b-charged particle setup:
France, ANR VS3 2006
240 k€
Spectroscopy setup:
Madrid
200 k€
TAS setup:
Valencia
180 k€
Neutron detection (multiplicity, TETRA setup): Dubna
200 k€
Neutron detection (energy):
(LPC Caen and others) 400 k€
MLL trap system:
LMU München
860 k€
MOT trap:
KVI Groningen
500 k€
Total (preliminary)
3300 k€
BESTIOL
300 k€
200 k€
150 k€
LUMIERE
Manchester
Orsay
Leuven
Synergies with FAIR/NuSTAR
Beam preparation: RFQs, traps, low-energy beam diagnostics
Trap-assisted spectroscopy (MATS)
Laser spectroscopy (LASPEC)
Neutron detection (NCAP)
New types of charged-particle and gamma detectors (e.g. LaBr2)
…….
To a large extend the same community!!!!
DESIR Milestones
 Dec 2008: technical report (SPIRAL2 TAC)
 2009: call for experiment proposals
 2010: building design study
 2011: construction of the building
 end 2013: day 1 of operation
B. Blank, M.J.G. Borge, P. Cambell, F. Leblanc, M. Lewitowicz, D. Lunney,
O. Naviliat-Cuncic, G. Neyens, B. Rubio, P. Thirolf, J.-C. Thomas
and many more…
Opened to everyone interested
----------------http://www.cenbg.in2p3.fr/desir