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Workshop on Radioactive Ion Beam Purification CERN, Sep 4 th 2007 Cara Jost

Beam development for the Center of Excellence for RIB Studies for Stewardship Sciences – Target and ion source for screening studies at Oak Ridge. Workshop on Radioactive Ion Beam Purification CERN, Sep 4 th 2007 Cara Jost. 50 MeV protons, 12 µA. 40 MeV protons, 50 nA.

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Workshop on Radioactive Ion Beam Purification CERN, Sep 4 th 2007 Cara Jost

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  1. Beam development for the Center of Excellence for RIB Studies for Stewardship Sciences –Target and ion source for screening studies at Oak Ridge Workshop on Radioactive Ion Beam Purification CERN, Sep 4th 2007 Cara Jost

  2. 50 MeV protons, 12 µA 40 MeV protons, 50 nA 50 MeV protons, 20 µA Holifield RIB Facility @ ORNL Accelerators: Cyclotron ORIC Tandem (25MV) RIB production: • RIB platform • High Power Target Lab • On-line Test Facility UNISOR

  3. On-line Test Facility UNISOR • Tandem beam: protons (40 MeV, max. 50 nA); heavy ions • Ion source: EBPIS or KENIS • TIS corresponds to HRIBF production platform → yields scalable • Moving tape station + γ-detector • Low radiation → TIS accessible shortly after irradiation

  4. Modified TIS for screening experiments • Transfer line: modified copy of ISOLDE prototype #1 • Ion source: standard EBPIS (MK5) • Cathode current connected at end of transfer line • Opening in the line to change trapping materials • Additional line heating to vary temperature

  5. Screening studies: Trapping materials Retention time on trapping material: • Material dependence: chemical composition, surface and bulk structure • Temperature dependence (mostly) Ceramic materials: • Wide range of chemical compounds and structures • High temperature stability • Low vapor pressure

  6. Screening studies: Experiments Materials to use: • Tantalum (as base line) • Quartz (comparison with ISOLDE data) • Aluminum oxide (Doping?) • Silicon carbide Elements to be surveyed: • Sr / Rb (→ (d,p) experiments) • Ag to Cs

  7. Screening studies: Experiments Data: • Yield measurements (different half-lives) • Hold-up times • Changes in yields / hold-up times with line temperature

  8. Thanks to: Ken Carter, Andreas Kronenberg, Charles Reed Dan Stracener Oliver Arndt, Karl-Ludwig Kratz Elian Bouquerel, Thierry Stora

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