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Status Report of the LISOL Laser Ion Source

Status Report of the LISOL Laser Ion Source. Yu.Kudryavtsev, T.Cocolios, M.Facina, J.Gentens, M.Huyse, O.Ivanov, D.Pauwels, M.Sawicka, P.Van den Bergh, P.Van Duppen, Instituut voor Kern- en Stralingsfysika, K.U. Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.

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Status Report of the LISOL Laser Ion Source

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  1. Status Report of the LISOL Laser Ion Source • Yu.Kudryavtsev, T.Cocolios, M.Facina, J.Gentens, M.Huyse, O.Ivanov, D.Pauwels, M.Sawicka, P.Van den Bergh, P.Van Duppen, • Instituut voor Kern- en Stralingsfysika, K.U. Leuven, • Celestijnenlaan 200 D, B-3001 Leuven, Belgium. Yu.Kudryavtsev, SMI06, March 27-28, 2006 1/24

  2. Louvain-la-Neuve Radioactive Beam Facility CYCLONE 110 CYCLONE 30 CYCLONE 44 LISOL LASER ION SOURCE LASERS 2/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  3. Energy (eV) gascell Ar SPIG 40 kV + + + 4 separator laser target 3-10mg/cm2 primary beam 0 LISOL laser ion source Time profiles of laser-ionized stable Ni-58 from a filament ~1994 Weak beam, 1nA, 1ms We need to provide: 1. Efficient laser ionization 2. Survival of laser-produced ions in a small volume around the exit hole Strong beam, 1uA,20ms Yu.Kudryavtsev, SMI06, March 27-28, 2006 3/24

  4. LISOL Laser Ion Source is used since 1994 in • Light ion-induced fusion evaporation reactions (Co,Ni,Mn) • Heavy ion-induced fusion evaporation reactions (Rh,Ru,Ti) • Proton-induced fission of U-238 (Ni,Co,Fe,Cu) • Stopping of 185 MeV Ni beam in a gas cell • Products from spontaneous fission Californium-252 (Rh,Ru,Mo,Pd) Yu.Kudryavtsev, SMI06, March 27-28, 2006 4/24

  5. Lay out of the gas cell and ion extraction 500mbar Ar 1e-2 mbar filament 1e-5mbar Fission cell Fusion cell Yu.Kudryavtsev, SMI06, March 27-28, 2006 5/24

  6. Laser System Energy (eV) Autoionizing state I.P. 4 0 2 Telescope Excimer laser 2 LPX240, 200Hz, 15ns Dye Laser 2 Synchron. Unit Energy meters Telescope Excimer laser 1 LPX240, 200Hz, 15ns 1 Dye Laser 1 SHG TOF SEM Atomic beam Reference Cell Laser Ion Source at the LISOL front end Tunable range 225 - 800 nm 15 m 6/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  7. Laser System Excimer lasers Dye lasers SHG Reference cell Yu.Kudryavtsev, SMI06, March 27-28, 2006 towards LIS Yu.Kudryavtsev, SMI06, March 27-28, 2006 7/24

  8. Two-step laser ionization schemes at LISOL 80% of all elements can be ionized by the LISOL laser system in two steps The aim – refractory elements (thin target and fast extracion) - found @ tested on-line - found @ tested off-line Yu.Kudryavtsev, SMI06, March 27-28, 2006 8/24

  9. - Studied isotopes - Isotopes measured in 2005 Proton-induced fission of U-238 Z 29 28 27 26 Detection set-up Yu.Kudryavtsev, SMI06, March 27-28, 2006 9/24

  10. Gamma spectroscopy of neutron-reach Fe isotopes In June 2006 – 192 hours of beam time (protons 30 MeV) Yu.Kudryavtsev, SMI06, March 27-28, 2006 10/24

  11. Isospin symmetry test Accurate comparison of Gamow -Teller transitions for A=46, 50 and 54 in beta decay and in (3He,t) reactions N=Z 54Fe(3He,3n) 54Ni Yu.Kudryavtsev, SMI06, March 27-28, 2006 180 11/24

  12. 922 keV: 411+511 keV Ig937=250(35), Pk/B = 2.3 P = 12 at/mC 3He2+ Ig937=177(16), Pk/B = 11.3 P = 17 at/mC Half-life fit: T1/2 = 109 (13) ms Beam ON Beam OFF Production of proton-reach nickel-54 isotope In April 2006 – 168 hours of beam time (3He 45MeV) 54Fe(3He,3n) 54Ni Test experiment in 2005 12/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  13. Spontaneously fission of Californium-252 Independent Yields of Spontaneous Fission for Cf-252 105 MeV 85 MeV 112Rh Life time – 2.645 y 252Cf decays: 96.9% to  3.1% to fission fragments 13/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  14. Cf-252 gas cell Heating Gas in Filament Exit hole Laser beams Water cooling Length – 16 cm Inner diameter – 7 cm Exit hole diameter – 0.5 mm Evacuation time (Ar) – 0 - 10 s 14/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  15. Gas cell for production of radioactive ions from spontaneously fission Cf-252 Californium - 252 source: Diameter – 3 mm Activity – 25 MBq, April 2004, (4  ) Transmission through degrader foil – 33% Fission fragments inside gas – 2 E5 at/s 500 mbar Ar α α Al foil, 6u α + + + α Movable holder + + α + + Plasma density – 1e8 ion-el pairs/cm3 Recombination time – 0.1 s + Cf-252 α α α α 1. Survival of elements with different chemical properties can be studied 2. Absolute efficiency can be measured Laserbeams SRIM calculation Rh 500 mbar Ar 15/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  16. Ar- 500mbar 252Cf 52 mm -gated gamma spectrum of Rh-112 from Cf-252 source Laser enhancement for Rh-112 isotopes from Cf-252 source lasers - ON 560 keV 560 keV Yield of 112Rh into gas – 2.6% -> 5000 at/s Laser ionized mass separated yield – 250 at/s Efficiency – 5 % Selectivity: – 160 lasers - OFF 16/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  17. Gamma spectroscopy using spontaneously fission Cf-252 source 114Rh Lasers - ON Ar- 500mbar 252Cf Lasers - OFF 52 mm Spectroscopy 113Rh -116Rh Branching ratios, life-times 17/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  18. Yield of Cesium isotopes from Californium source Ar- 500mbar 252Cf SPIG transport eff. – 60% Mass separator eff. – 90% 500 mbar Ar 74% of Cs atoms stay in a single charge state Ionization potential of Cesium - 3.9 eV 40% Distance to the exit hole-32 mm 32 mm 18/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  19. Ar- 500mbar 252Cf Distance Survival of Cesium Ions in Argon Short-leaved isotope can be used to probe the evacuation time inside the gas cell 19/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  20. The problem to be solved: Ion source efficiency at high cyclotron beam current 20/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  21. Laser ion source efficiency for heavy ion-induced fusion evaporation reaction gas lasers 40Ar + 58Ni => 98Pd* => Rh/Ru + xp yn 95Rh 40Ar Extraction efficiency as function of primary 58Ni beam intensity Ni beam 21/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  22. Recombination of laser-produced ions at high beam intensity gas Lasers -off 58Ni beam Time profile of extracted 40Ar ions High plasma density in the laser ionization region 22/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  23. Collection of electrons after the cyclotron pulse gas Lasers 58Ni beam Collector plate 2.9E10ions/s Collection of electrons before laser ionization increases ion signal 23/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

  24. Separation of stopping and ionization volumes gas Stopping volume Cyclotron beam Target Ionization volume Laser beams 24/24 Yu.Kudryavtsev, SMI06, March 27-28, 2006

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