1 / 19

Accelerator Collaboration for Exotic Beam Experiments

This outline outlines the collaboration between Madrid, Aarhus, and Göteborg universities for experiments at the DESIR facility at SPIRAL2. The facility aims to study the decay, excitation, and storage of radioactive ions using SPIRAL2 and SPIRAL low energy beams. The outline also discusses the beam requirements and suggested solutions for producing high-purity beams at SPIRAL2. Furthermore, it highlights the MAGISOL meeting, the SHIRaC project, and the high-resolution mass separator. The outline concludes with a discussion of the DESIR experimental setups, including LUMIERE and BESTIOL, and the general-purpose setup for neutron-deficient nuclei spectroscopy.

keithball
Download Presentation

Accelerator Collaboration for Exotic Beam Experiments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Madrid-Aarhus-Göteborg @ ISOL DESIR @ SPIRAL 2 Outline: GANIL SPIRAL SPIRAL2 DESIR Collaboration Experiments at DESIR Highlights Planning Mª José Gª Borge

  2. GANIL / SPIRAL 2 Existing GANIL facility LIRAT Production building DESIR Low energy beams from SPIRAL and SPIRAL2 (and S3 ?) S3 High-intensity stable beams on thin target + in-flight high-resolution separator + gas cell for stopping + ?? LINAG (high intensity d and stable beams) LISE SISSI CIME

  3. The DESIR facility at SPIRAL2 Désintégration, Excitation et Stockage d’Ions Radioactifs Decay, excitation and storage of radioactive ions • collaboration initiated during the first SPIRAL2 workshop, July 2005 • to use SPIRAL2 and SPIRAL low energy (30-60 keV) beams for decay spectroscopy laser spectroscopy ion and atom trap experiments • Spokes-person: Bertram Blank • GANIL liaison: Jean-Charles Thomas Mª José Gª Borge

  4. Beam requirements for ISOL-type experiments:  high degree of purity needed for exotic beams ! = good mass selectivity and element selectivity. Suggested solutions for SPIRAL2 produced beams: + RFQ high-efficiency cooler/buncher for efficient reduction of beam emittance + high resolution mass separator + laser ionization source (element selection during ionization) Mª José Gª Borge

  5. The DESIR Facility • The DESIR instalation: • RFQ + HRS in the production building • building close to GANIL/SPIRAL and SPIRAL2 Facilities • Radioactive beams from GANIL, SPIRAL2 and S3 Mª José Gª Borge MAGISOL Meeting 19-21 January 2009

  6. SHIRaC = SPIRAL2 High Intensity Radiofrequency Cooler Prototype RFQ linear Paul trap, set up initially at CSNSM Orsay Now transferred to LPC Caen for further development Goals: * high-voltage (20 kV), high frequency (20 MHz) linear radio-frequency quadrupole trap for strong confinement of mA beams. (gain factor 100 in confinement compared to present devices) * incorporate an electrostatic quadrupole deceleration field (to reduce losses at the injection) Results so far: * Prototype tested at high-current separator SIDONIE (Orsay) a 1.1 mA beam has been trapped (O. Gianfrancesco et al., Proc. EMIS2007)

  7. High Resolusion Mass Separator • symmetric design, inspired by the CARIBU HRS at Argonne National Laboratory: with two magnetic dipoles D combined as QQHQD M DQHQQ six quadrupoles Q two sextupoles H one multipole M  To minimize aberrations, provide large mass dispersion Beam profile in x-direction Suggested layout • High transmission • Compact (12m x 8m) • Match beam emittance from RFQ cooler • M/M = 20000 Status: in design phase To be incorporated in production building

  8. Schematic SPIRAL 2 LAYOUT EXISTING EXPERIMENTAL AREAS EXISTING ACCELARATORS CSS1 CSS2 CIME PRODUCTION BUILDING LINAG Recent idea from 2007: send S3 radio-isotopes (re-ionized from gas cell) to DESIR set-ups for mass, radii, moments, decay studies …. DESIR S3

  9. The DESIR experimental set-ups BESTIOL LUMIERE MOT LPCTrap Mª José Gª Borge

  10. LUMIERE Light Utilization for Measurements and Ionization of Exotic Radioactive Elements Nuclear properties deduced from observation of magnetic and electrostatic hyperfine structure in optical spectra. Techniques: Collinear Laser Spectroscopy β-NMR (Nuclear magnetic Resonances) • Key-Experiments: - • Extending charge radii , moments and spins of nuclei around 78Ni and 132Sn (neutron-rich isotopes in the fission peaks) • Charge radius changes in exotic Rb(N>90), Sr (N>100) and Yb (N>177) • Hyperfine structure and charge radii of Trans-actinides • Ground state spin of N = 49 and N = 51 isotones with even Z (β-NMR ) • Charge radius of 100Sn (S3) Mª José Gª Borge

  11. BESTIOL (Beta dEcay at the Spiral2 IsOL Facility) • Beta-decaystudies can be done withverylowyield. • Half-lifedetermination. Firstglanceintothestructure of thenucleus. • Highproductionallows full spectroscopy degree of overlapbetweenproton and neutronstates in parent and daughternucleus. • Farfromstability beta-delayedparticledecay open. • Highlights: • Super-allowed -decays and the standard model of electro-weak interaction • Stellar nucleosynthesis at A  80 ; 80Zr • New Magic numbers • Shape coexistence, deformation and Gamow-Teller distribution • Transition from order to chaos Mª José Gª Borge

  12. General Purpose Set up • DSSD-detectors for p • Array of Clover detectors • ToF for neutron spectroscopy. • Need of fast tape station • Physics: • Transition from order to chaos in neutron deficient nuclei • Search for new candidates to -2p emission • New magic numbers: Characterization of 40Mg, 54Ca. • Nuclei with large N/Z ratios need to be produced : 110Zr70 • Odd-even stagering in the S2n of nuclei near 132Sn Mª José Gª Borge

  13. Double Penning –Trap assisted spectroscopy: Super-allowed -decays MLL-Trap built in Munich will serve to purified the beam -Fast separation -Sufficiently high resolving power (M/M = 105) -high capacity (up to 106 ions) -high transmission ( > 30 %) • Present knowledge of fundamental interactions summarized in standard model. Tested by high precision measurement (10-4) of super-allowed Fermi decays: Q,T,BR • Ft = ft(1+’R)(1+NS-c) = K/MF2G’2V • Study of N = Z odd-odd nuclei 82Nb, 86Tc, 90Rh , 94Ag and 98In Mª José Gª Borge

  14. Total Absortion Spectroscopy after the MLL-Trap With very purified beams one can do Total absortion spectroscopy to obtain the BGT- distribution Surrey-Valencia 12 BaF2 TAS Mª José Gª Borge

  15. Beta-delayed neutron Set up Mª José Gª Borge

  16. Equipment to come to DESIR MLL trap system: LMU München 860 kEuros b-charged particle setup: France, ANR VS3 2006 240 kEuros Collinear laser spectroscopy: Manchester 300 kEuros Orsay 200 kEuros Leuven 150 kEuros b-NMR setup: Leuven 100 kEuros Spectroscopy setup: Madrid 200 kEuros MOT trap: KVI Groningen 500 kEuros TAS setup: Valencia 180 kEuros Neutron detection (multiplicity, TETRA setup): Dubna 200 kEuros Neutron detection (energy): (LPC Caen and others) 400 kEuros

  17. DESIR: Financial situation • Main parts: estimated costs fund available • RFQ and HRS « building »: most likely included in SPIRAL2 project • DESIR building: 6000 k€ 2000 k€ (CPER) • RFQ: 320 k€ 320 k€ (CPER) • HRS: 500 k€ - • beam lines: 3600 k€ - • off-line source 60 k€ -

  18. NFS LINAC SRI S3 DESIR Facility low energy RIB RIB production building RFQ+HRS • Recent modifications: • High-intensity stable beam ion source (A/q=3) included in the baseline project • RIB laser source included in the baseline project • RFQ+HRS also for post-accelerated beams • Only one production cave in the production building • SRI hall not included in the Phase 1 GANIL/SPIRAL 1 today

  19. Schedule of SPIRAL 2 Decision on the construction of DESIR (dead-line)

More Related