The DESIR low energy beam facility at SPIRAL
The DESIR low energy beam facility at SPIRAL 2 Decay, Excitation and Storage of Radioactive Ions http: //www. cenbg. in 2 p 3. fr/desir Collaboration promoting ISOL beams at SPIRAL 2 Spokes-person: B. Blank, Bordeaux; blank@cenbg. in 2 p 3. fr B. Blank GANIL liaison: J. -C. Thomas, Caen; thomasjc@ganil. fr J. -C. Thomas, ØDESIR @ SPIRAL 2 Ø Beam preparation Ø The DESIR Facility (building and equipments) Ø Cost estimates / Synergies / Milestones J. -C. Thomas, GANIL 3 rd LASPEC-MATS workshop, 9 -10 October 2008, Matalascañas, Spain
Why a low energy beam facility at SPIRAL 2 ? v Different production modes considered ü n-induced fission -> neutron-rich nuclei ü fusion reaction -> Superheavy, n-deficient nuclei (+ refractory elements) ü fragment products at low-energy -> light exotic nuclei v Large variety and high degree of purity for exotic beams ü all kind of ionization sources (including laser ionization) ü high-efficiency RFQ cooler/buncher + high-resolution mass separator
N F S SPIRAL 2 layout LINAG Fusion reaction 14 A. Me. V A/Q=3 HI, 1 m. A S 3 DESIR Level 0 15 m Level -1 n-induced 238 U fission 40 Me. V 5 m. A deuterons 1014 fissions/s Fragmentation + ISOL 95 A. Me. V 36 Ar 3 k. W Production building GANIL/ SPIRAL
RFQ and HRS cave in the production building 8 m S HR Production building Legend: SHIRa. C 12 m Electronics Quadrupole RFQ Sextupole storage and maintenance Multipole Dipole
SHIRa. C SPIRAL 2 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 k. V), high frequency (20 MHz) linear radiofrequency quadrupole trap for strong confinement of m. A 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. EMIS 2007
High resolusion mass separator v 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 v minimized aberrations, large mass dispersion v expected performances : M/DM ~ 2. 104 for a 1 p. mm. mrad at 10 to 60 ke. V Beam profile in x-direction Suggested layout T. Kurtukian-Nieto, CENBG
LUMIERE BESTIOL S TA G pu en rp era os l e IS e in f-l ce of our s 2 RFQ buncher Gas & waste storage e in f-l ce of our s 1 C sp olli ec ne b- tro ar L N sc a M o s R p er y Level 0 LN 2 MLL trap C LP ap tr on tr eu h N ditc e bl ou T D MO al er e en os G rp pu Control room Beam from Production building Level -1 DESIR layout – level 0 P D enn ec in ay + g s tra et p up Identification station with Beam from S 3 tape Laser room (mezzanine) DAQ room Level -1 Beam from SPIRAL 1 Crane access to basement 5 m Electronics Desk Access
Workshop free Assembly Room 3 Gray Room 1 HV free Supply supplies Gray Electri. Room 2 city Stor- age 2 Stor- age 1 Assembly Room 1 Room 2 Control Racks Interfaces Beam from SPIRAL 1 Crane access to basement 5 m on tr eu h N ditc Beam from Production building DESIR layout - Level -1 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 at the SPIRAL 2 Is. OL facility BE decay STudies ST M. J. G. Borge, Madrid • Decay studies with halo nuclei • 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 • 2 n 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): 50 Mn, 54 Co with DM/M~10 -10 - transuranium isotopes (beams from S 3): 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 DESIR building 6000 k€ 2000 k€ (CPER) RFQ HRS Available funds 320 k€ (CPER) 1000 to 1500 k€ - 3600 k€ - beam lines RFQ + off-line sources 200 k€ Total (preliminary) 11000 to 16000 k€
Equipments foreseen at DESIR Collinear laser spectroscopy: b-NMR setup: Leuven 100 k€ b-charged particle setup: France, ANR VS 3 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/Nu. STAR 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. La. Br 2) ……. To a large extend the same community!!!!
DESIR Milestones v Dec 2008: technical report (SPIRAL 2 TAC) v 2009: call for experiment proposals v 2010: building design study v 2011: construction of the building v 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. in 2 p 3. fr/desir
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