workshop on radioactive ion beam purification cern, sep 4 th 2007 cara jost
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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
Holifield RIB Facility @ ORNLAccelerators:
Cyclotron ORIC
Tandem (25MV)
RIB production:• RIB platform• High Power Target Lab• On-line Test
Facility UNISOR
50 MeV protons, 12 µA
50 MeV protons, 20 µA
40 MeV protons, 50 nA
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
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
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
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
Screening studies: Experiments
Data:
- Yield measurements (different half-lives)- Hold-up times- Changes in yields / hold-up times with line temperature
128-Sn holdup from UCx target
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
0 10 20 30 40 50 60
time (min)
46 keV
75 keV
152 keV
482 keV
Fit
beam off
↓
beam on
↓
beam off
↓
Ken Carter, Andreas Kronenberg, Charles Reed
Dan Stracener
Oliver Arndt, Karl-Ludwig Kratz
Elian Bouquerel, Thierry Stora
Thanks to: