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LASer techniques for Exotic nuclei Research (LASER)

LASer techniques for Exotic nuclei Research (LASER). Iain Moore (JYFL) on behalf of the LASER collaboration. Participating institutes: IKS – K.U. Leuven, Belgium IPN – Orsay, IN2P3, France IP-Quantum, Mainz, Germany JYFL, Finland ISOLDE, CERN, Switzerland IKP, Mainz, Germany

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LASer techniques for Exotic nuclei Research (LASER)

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  1. LASer techniques for Exotic nuclei Research (LASER) Iain Moore (JYFL) on behalf of the LASER collaboration • Participating institutes: • IKS – K.U. Leuven, Belgium • IPN – Orsay, IN2P3, France • IP-Quantum, Mainz, Germany • JYFL, Finland • ISOLDE, CERN, Switzerland • IKP, Mainz, Germany • GSI – Darmstadt, Germany • University of Manchester, UK LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  2. Objectives Increase of ionization efficiency Resonant Laser Ionization • More efficient use of ISOL beams • New exotic (polarized, isomeric) RIB • Optimization of RIB time structure • Easy injection into ion traps • Determination of radii, spins and moments using in-source spectroscopy • Reduction of backgroundin collinear spectroscopy Increase of ion beam quality • purity • - emittance • time structure Energy (eV) 4 0 • To develop tools and perform R&D for the resonance ionization laser • ion sources for the production of extremely pure ground state and isomeric • beams of exotic nuclei. • In-source laser spectroscopy • Accumulation, cooling, bunching and polarization of radioactive ion beams LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  3. Research program Description of work: Task T-J08-1: Development of a new laser system for RILIS (K. Wendt, Mainz) Task T-J08-2: New laser ionisation schemes and new beams (I. Moore, JYFL) Task T-J08-3: Prototype LIST system (W. Nörtershäuser, GSI) Task T-J08-4: Improve selectivity of RILIS: reduction of surface ionisation (V. Fedosseev, ISOLDE) Task T-J08-5: Implementation of electrical fields in the gas cell concept (S. Franchoo, IPNO) Task T-J08-6: Feasibility study to polarize exotic nuclei with lasers (G. Neyens, K.U.Leuven) LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  4. Task 1 – Development of new laser system for RILIS Participants: U-Mainz, JYFL, U-Manchester, K.U. Leuven, ISOLDE, IN2P3 IPO Orsay • Development of prototype solid state laser system + doubling/tripling/quadrupling • Installed at U- Mainz, JYFL, TRIUMF, ORNL (tested) • Recent successful demonstration of injection-locked Ti:Sapphire laser with spectroscopy on 27Al • Intercomparison of dye ↔ Ti:Sa and high rep rate ↔ low rep rate suitable at JYFL T. Kessler et al., Hyp. Int. 171 (2006) 121 LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  5. JYFL Laser development highlights U-Mainz and JYFL T. Kessler et al., to be submitted ~5 GHz Ti:Sa seeded to 20 MHz! LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  6. 2007 – LARIS lab setting up at ISOLDE, CERN 2008 – off-line RILIS ion source to be built FURIOS at JYFL – a twin laser facility Full spectral coverage at a range of repetition rates, linewidths and powers…. Pulsed dye lasers, pumped by CVL (12 kHz) or by 50 Hz Nd:YAG CW dye lasers Ti:Sapphire lasers pumped by Nd:YAG (12 kHz) I.D. Moore, J. Phys. G 31 (2005) S1499 LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  7. Ti:Sapphire laser ion source • New ionization schemes: Al, Ca, Fe, Ni, Cu, Ga, Zn, Ge, Y, Tc, Pd, Sn, Gd, Yb, Th, Pu (on-line experiments) LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  8. Task 2 – New laser ionization schemes and new beams A Selective and Efficient Ionization Scheme for Lithium Participants: GSI LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  9. Measurement of the charge radius of the halo nucleus 11Li F=2 → F=2 F=1 → F=1 R. Sánchez et al., PRL 96, 033002 (2006) Nature Physics 2, 145 (2006) M. Puchalski et al., PRL 97, 133001 (2006) LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  10. Laser ionization of polonium at the ISOLDE-RILIS Participants: K.U. Leuven, ISOLDE, IN2P3 IPO Orsay, U-Mainz Development of 2 new laser ionization schemes for Po – first time for laser ionization of polonium First test to study the saturation capability of the chosen schemes LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  11. Based on the extracted yields experiments have been proposed and performed: IS452, in-source spectroscopy of Po. Test in November 2006 The RILIS yields of n-deficient polonium isotopes are compared to the 20 year old yields obtained from the hot plasma source MK5. Note the U density in the target was 5 times less in the earlier work. LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  12. Study of ground-state properties of n-def Po Spectroscopy performed on the second transition • in-source laser spectroscopy: d<r2>, Q, m (down to 193) • decay spectroscopy • post-accelerated (isomeric beams) with REX-ISOLDE: Coulomb excitation, transfer reaction studies new down to 182Pb (T1/2 = 55 ms) K.U. Leuven, Mainz, ISOLDE, IPNO-Orsay Odd-even staggering in Hg H. De Witte et al., Phys. Rev. Lett. 98 (2007) 112502 LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  13. 60453 cm-1 7.28 eV 842 nm 48572 cm-1 395 nm 23265 cm-1 430 nm 0 cm-1 Off-line laser ionization of Tc – towards N = Z studies 1014 atoms of 99Tc (t½ = 2.1×105 years) on Re filament (Mainz) 3-step laser ionization scheme using Nd:YAG pumped Ti:Sapphire lasers (JYFL) Participants: JYFL, Mainz, KU-Leuven T. Kessler et al., Hyp. Int. 171 (2006) 121 LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  14. Off-line laser ionization of Tc – 2 step at LISOL LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  15. Production of isobarically pure ion beams with optimum spatial and temporal ion pulse control using a gas-filled RFQ structure Ion Repeller Mass Separator typical ISOL Source Laser- Ti:Sa 1 Beams Gas filled RFQ Trap Ti:Sa 2 Ion Beam Proton Beam Ti:Sa 3 Nd:YAG HV Platform to Experiments Laser System • Atomic Beam Source with Surface Ion Repeller– Gas cell • 3. Mass Separator 2. Gas filled RFQ Trap Section for Bunching and Cooling 4. Laser System Task 3 – Prototype LIST system Participants: GSI, Mainz, JYFL, Manchester LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  16. Switchable Electrodes Laser Ionization inside the Trap Structure Atomizer Buffer Gas Atoms Laser Beams Ion Repeller RFQ Segments Electron Repeller U End Plate DC 10 mm Accumulate Laser Ionization Laser Ions Surface Ions Electrons Release Z SIMION 7.0: simulation of the potential distribution Ions The gas-filled linear RFQ trap LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  17. 20000 Stable Ga isotopes @ RISIKO, UMz Cooling: 100 laser shots, cooled and bunched, efficiency ~ 12 % 17500 15000 12500 FWHM < 7 µs Ions 10000 7500 Pulsing: 10 ms accumulation of 100 laser shots in the trap, no gas, no cooling 5000 Ions from individual laser shots per 100 s 2500 0 Integrated 65514 Ion-pulses 0 25 50 75 100 125 150 175 200 Time / µs Pulsed and cooled beams from LIST Maximum loading capacity 4×106 ions/cooling cycle LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  18. Proton-induced fission of uranium Light-ion induced fusion-evaporation JYFL sextupole ion guide First LIST ions seen in using bismuth and technetium, optimizing of gas jet (Laval nozzle) P. Karvonen, I.D. Moore et al., to be submitted I.D. Moore et al., Hyp. Int. 171 (2006) 135 LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  19. Surface ionization Neutrals Laser ionization + Task 4 – Improve selectivity of RILIS: reduce surface ions Participants: ISOLDE, U-Mainz • Traditional tube materials: • tungsten Ø = 4.5 eV • tantalum Ø = 4.2 eV • molybdenum Ø = 4.6 eV at T > 2000 °C Selectivity10-20x Efficiency 10 % LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  20. Other materials GdB6 Ø = 1.5 eV, BaOSrO Ø < 1.4 eV T 1200 °C, Eff = 10%, Selectivity > 1000, Emittance 1 π mm mrad LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  21. Task 5 – Implementation of electrical fields in gas cells Participants: JYFL, Manchester, K.U. Leuven, U-Mainz, IPN Orsay • A new ion guide has been modelled and tested for the production of a low energy ion beam of daughter products from alpha-emitting isotopes. B. Tordoff et al., NIM B 252 (2006) 347 • Work is about to start on a design with an rf carpet, combined with DC fields at JYFL. • K.U. Leuven have tested a new gas cell where the laser ionization zone is shielded from the primary beam and stopping region. LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  22. Task 6 – Feasibility study to polarize nuclei with lasers Optical manipulation in the RFQ cooler (JYFL, Manchester) P. Campbell, Hyp. Int. 171 (2006) 143 363.3nm pumping 40% transfer 1 pA of 89Y continuous beam LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  23. 98Y 96Y 97Y 89Y On-line success with neutron-rich yttrium Effect of optical pumping from the ground state Natural metastable population 98Y 5.17 hrs 16.7 mins Several cases of interest: Niobium Platinum Osmium Rhenium Iridium Tungsten etc LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  24. LASER summary • Almost all milestones are on track to be completed, some (task 6) • have evolved far beyond what was originally expected. • Associate partners have been participating in workshops and in sharing information throughout the laser community (ORNL Oak Ridge, TRIUMF Canada, Gatchina Russia). • Workshops organised: 2005 (Leuven), 2006 (Poznan – as part of Application of Lasers in Atomic Nuclei Research conference), 2007 (Saariselka, joint workshop with LASER-TRAPSPEC) • In most of the tasks, several facilities participated in developments and experiments, sending students to gain experience. • selectivity, efficiency, time structure • isomeric beams • management of the radioactive inventory Radioactive Ion Beam facility RILIS LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

  25. INTAG LASER 68Cu 6- (+1+) (5-) 68Cu 1+ 120Sn 2+-0+ 956 4- 178 778 0.7 <T1/2< 4 ns (3-) 6- 722 3.7 min (3+) 3.7 min 722 610 6- 693 85 85 T1/2=7.84 ns (2+) Energy (keV) 1+ 0 30 s 30 s 0 1+ Post-accelerated isomeric Cu beams @ ISOLDE • 68m,gCu (2.86 MeV/u, 3 105 pps, 74% pure) @ 120Sn (2.3 mg/cm2) ISOLDE IPN-Orsay K.U. Leuven 6- 1+ LASER, Joint EURONS-EURISOL Town Meeting, Helsinki, Sept. 17, 2007

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