Current status of laser ionization at IGISOL and future concepts for the MARA recoil separator Iain Moore ARIS 2014, Advances in Radioactive Isotope Science,

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Presentation transcript:

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

 The ion guide technique - towards a more element-selective approach  Recent laser-related highlights (2013 – to date)  MARA – a vacuum-mode recoil mass separator  New concepts – a low-energy RIB facility at MARA Outline of talk ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014

The ion guide method An ISOL system for ALL elements Fast extraction ( ~ ms)  Relatively low efficiency  Poor selectivity Projectile source Thin target Mass separator Ion guidance through rf sextupole Ion survival → ion guide method (non-selective) Neutralization → laser re-ionization (Z selectivity) ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014

K=30 MeV cyclotron from K=130 MeV cyclotron IGISOL-4 – since 2013 Off-line ion sources: (discharge, carbon cluster…) Laser transport for optical manipulation/IRIS Mass spectrometry & post-trap spectroscopy Collinear laser spectroscopy Laser ionization in-source/in-jet Decay spectroscopy (beam line not shown) ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014 M. Reponen, Poster # PS1-C016 A. Jokinen, Plenary, Tuesday

A more element-selective approach First on-line in-gas-cell laser ionization (2013): 58 Ni(p,n) 58 Cu (τ 1/2 =3.2 s) Dual-chamber gas cell Mass separator A=58 Lasers on/off 1 hour ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014 Total efficiency ~ 1%

Gas jet laser ionization – how and why? a quest for PURE radioactive ion beams → (the Laser Ion Source ``Trap´´) I.D. Moore et al., AIP Conf. Proc. 831 (2006) 511 Yu. Kudryavtsev et al., NIMB 297 (2013) 7 2 P 3/2 2 P 1/2 2 S 1/2 FjFj FiFi an optimal environment for spectroscopy (reduced temperature and pressure) F=J+IF=J+I N N S S ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014

Free jet laser ionization in LIST geometry 63 Cu V jet ~1040 m/s FWHM = 3.9 GHz FWHM = 6.7 GHz FWHM = 1.8 GHz Employ special nozzles M. Reponen et al., NIMA 635 (2011) 24 Laser linewidth dominated He, 180 mbar I.D. Moore et al., NIMB 317 (2013) 208 ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014

Fast piezo mirror Fast-switched photodiode amplifier Ti:sapphire crystal d = n λ cw Lock-in Amplifier (TEM Laselock) PSD HV out Input: CW seed laser 1-100mW Matisse TS Ti:sa (100 kHz linewidth) Output pulsed, 30 ns width 2-5 W average power 20 MHz linewidth pump laser W, 10 kHz ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014 Development of narrowband pulsed Ti:sapphire laser for gas-jet spectroscopy V. Sonnenschein, Poster # PS2-C018

ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014 First spectroscopy with the narrowband laser Tested in Mainz to measure HFS of 227 Ac ( τ 1/2 =22 y) Same transition applied by LISOL team, May 2014, on Ac (see results in plenary talk, M. Huyse) AI cm -1 J=5/ cm nm J 0 =3/2 0 cm -1, 6d7s 2 IP nm Future: measure Pu via in-jet RIS followed by high resolution collinear laser spectroscopy (Mainz, Leuven, Manchester and Liverpool) In-jet RIS in the search for 229m Th (new EU Horizon 2020 application)

MARA: “Mass Analysing Recoil Apparatus” Quadrupole triplet Electrostatic deflector Magnetic dipole Focal plane Beam A new vacuum mode recoil separator J. Sarén, PhD thesis, University of Jyväskylä (2011) QQQED configuration 1st order resolving power ~ 260 Angular acceptance 10 msr Advanced mass slit system ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014 J. Uusitalo, Poster # PS2-C006

A low-energy RIB facility at MARA ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014 MR-TOF-MS funded and under design at IGISOL (T. Eronen) 24 Mg( 58 Ni,2n) 80 Zr Cross section 10 µb (C.J. Lister, 1987) Total fusion-evap. ~ 500 mb 200 pnA, two charge states, Zr focal plane Expect few atoms/s for in-jet RIS, ~ 10 ions/s at the MR-TOF-MS.

“Day 1” experiments – heavy N~Z nuclei for the rp-process ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014 Mass measurements & laser spectroscopy: Region of N ~ Z 80 Zr Reion of N ~ Z 94 Ag Region of N ~ Z 100 Sn Combining experts from the IGISOL and nuclear spectroscopy groups, with external support from Leuven. Providing a platform for testing novel devices for S 3 at SPIRAL-2

Thank you IGISOL-laser team: I. Pohjalainen, M. Reponen, V. Sonnenschein, A. Voss + IGISOL MARA team J. Uusitalo, J. Sarén, J. Partanen

Inductively-heated hot cavity catcher (2014) Development program towards production of N=Z 94 Ag 487 MeV 107 Ag 21+ Variable Ni degrader foil Pulse cyclotron, measure extraction time Heating coil Primary beam Mo crucible SPIG Variable Ni degrader foil ARIS 2014, Advances in Radioactive Isotope Science, Tokyo, June1-6, 2014