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Current Status of Laser Ionization at IGISOL and Future Concepts for the MARA Recoil Separator

This talk discusses the ion guide technique and its potential for element-selective approaches in laser ionization. It also highlights recent laser-related advancements and introduces the MARA recoil separator. New concepts, including a low-energy RIB facility at MARA, are also explored.

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Current Status of Laser Ionization at IGISOL and Future Concepts for the MARA Recoil Separator

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  1. Current status of laser ionization at IGISOL and future concepts for the MARA recoil separator Iain Moore Department of Physics, University of Jyväskylä, Finland ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  2. Outline of talk • The ionguidetechnique • - towards a moreelement-selectiveapproach • Recentlaser-relatedhighlights (2013 – to date) • MARA – a vacuum-moderecoilmassseparator • New concepts – a low-energy RIB facility at MARA ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  3. The ionguidemethod • An ISOL system for ALL elements • Fastextraction (~ms) • Relativelylowefficiency • Poorselectivity Projectilesource Thintarget Ionguidancethrough rfsextupole Mass separator • Ionsurvival→ionguidemethod (non-selective) • Neutralization→ laser re-ionization (Z selectivity) ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  4. IGISOL-4 – since 2013 from K=130 MeV cyclotron https://www.jyu.fi/fysiikka/en/research/accelerator/igisol Off-lineionsources: (discharge, carboncluster…) K=30 MeV cyclotron Laser transport foroptical manipulation/IRIS Laser ionizationin-source/in-jet Collinear laser spectroscopy Decayspectroscopy (beamlinenotshown) Massspectrometry & post-trapspectroscopy M. Reponen, Poster # PS1-C016 A. Jokinen, Plenary, Tuesday ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  5. A more element-selective approach • Firston-linein-gas-cell laser ionization (2013): • 58Ni(p,n)58Cu (τ1/2=3.2 s) • Dual-chambergascell • MassseparatorA=58 • Laserson/off 1 hour • Total efficiency~1% ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  6. Gas jet laser ionization – how and why? • a quest for PUREradioactiveionbeams • → (the Laser IonSource ``Trap´´) I.D. Moore et al., AIP Conf. Proc. 831 (2006) 511 Yu. Kudryavtsev et al., NIMB 297 (2013) 7 • an optimalenvironment for spectroscopy • (reducedtemperature and pressure) N 2P3/2 Fj S 2P1/2 2S1/2 Fi F=J+I ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  7. Free jet laser ionization in LIST geometry FWHM = 1.8 GHz 63Cu FWHM = 6.7 GHz He, 180 mbar Vjet ~1040 m/s FWHM = 3.9 GHz • Employspecialnozzles • M. Reponen et al., NIMA 635 (2011) 24 • Laser linewidthdominated I.D. Moore et al., NIMB 317 (2013) 208 ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  8. Development of narrowband pulsed Ti:sapphire laser for gas-jet spectroscopy Lock-in Amplifier (TEM Laselock) Output pulsed, 30 nswidth 2-5 W average power 20 MHz linewidth HV out PSD Fast piezomirror Input: CW seedlaser 1-100mW Matisse TS Ti:sa (100 kHz linewidth) d = n λcw Fast-switched photodiode amplifier Ti:sapphirecrystal pump laser 10-20 W, 10 kHz V. Sonnenschein, Poster # PS2-C018 ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  9. First spectroscopy with the narrowband laser • Tested in Mainz tomeasure HFS of227Ac (τ1/2=22 y) • Sametransitionappliedby LISOL team, May 2014, • on 212-215Ac (seeresults in plenarytalk, M. Huyse) AI 46347.0 cm-1 IP 424.7 nm J=5/2 22 801.1 cm-1 438.58 nm J0=3/2 0 cm-1, 6d7s2 • Future: measure236-244Pu via in-jet RIS followedbyhighresolution • collinear laser spectroscopy (Mainz, Leuven, Manchester and Liverpool) • In-jet RIS in the search for 229mTh (new EU Horizon 2020 application) ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  10. MARA: “Mass Analysing Recoil Apparatus” A new vacuummoderecoilseparator Electrostaticdeflector Quadrupoletriplet Magneticdipole Focalplane Beam • QQQED configuration • 1st orderresolvingpower~260 • Angularacceptance 10 msr • Advanced massslitsystem J. Uusitalo, Poster # PS2-C006 J. Sarén, PhDthesis, University of Jyväskylä (2011) ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  11. A low-energy RIB facility at MARA 24Mg(58Ni,2n)80Zr Crosssection 10 µb (C.J. Lister, 1987) Total fusion-evap. ~500 mb 200 pnA, twochargestates, 40 80Zr ions/s @ focalplane Expectfewatoms/s for in-jet RIS, ~10 ions/sat the MR-TOF-MS. • MR-TOF-MS funded and under design at IGISOL(T. Eronen) ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  12. “Day 1” experiments – heavy N~Z nuclei for the rp-process • Massmeasurements & • laser spectroscopy: • Region of N~Z80Zr • Reion of N~Z94Ag • Region of N~Z100Sn Combiningexpertsfrom the IGISOL and nuclearspectroscopygroups, with external supportfromLeuven.Providing a platform for testingnoveldevices for S3 at SPIRAL-2 ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

  13. IGISOL-laserteam: I. Pohjalainen, M. Reponen, V. Sonnenschein, A. Voss+ IGISOL MARA team J. Uusitalo, J. Sarén, J. Partanen Thankyou

  14. Inductively-heated hot cavity catcher (2014) Developmentprogramtowardsproduction of N=Z94Ag Heatingcoil VariableNidegraderfoil Mocrucible SPIG Primarybeam • 487 MeV107Ag21+ • VariableNidegraderfoil • Pulsecyclotron, • measureextractiontime ARIS 2014, Advances in RadioactiveIsotope Science, Tokyo, June1-6, 2014

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