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History of the project :

T ests at HiRadMat of advanced SiC and Al 2 O 3 as model targets for radioisotope beam production Experiment proposal Collaboration:

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History of the project :

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  1. Tests at HiRadMat of advanced SiC and Al2O3 as model targets for radioisotope beam production Experiment proposal Collaboration: Michal Czapski*, Thierry Stora*, Stefano Sgobba*, Raul Luis***, Stefano Marzari*, Serena Cimmino*, Daniel Urffer**, Caroline Tardivat** *CERN: EN-STI-RBS & EN-MME-MM **Saint Gobain CREE (advanced ceramics R&D) ***ITN Lisbon

  2. History of the project: • 2010 - SandrinaFernandes’ PhD thesis at CERN dedicated to submicro- and nano-structured porous ceramics to produce more intense beams of exotic isotopes (before historical targets had grain size of 5 -30 microns) • The discovery is further extended for ISOLDE and the other facilities worlwide are starting to duplicate these findings

  3. Goal of the proposal : Comparison ageing studies of influence of pulsed beams of 1.4 GeV (ISOLDE) and 450 GeV (HiRadMat) on new advanced model targets of tailored-made microstructure (synthesized at Saint Gobain- Centre Recherche Etudes Europeens – world leader in ice-templatingmethod) to understand how beam energy impacts ageing (causing decrease of good release efficiencies of ISOLDE targets)

  4. Marie Curie Initial Training Network CATHI (Cryogenics, Accelerators and Targets at HIE ISOLDE) ESR 8 Target Material Studies Ageing under pulsed beams Michal Czapski (EN/STI-RBS and EN/MME-MM*)

  5. Ionization Effusion Diffusion

  6. Target properties MECHANICAL PROPERTIES ISOTOPE PRODUCTION • high resistance to radiation damage • limited sintering and ageing • high operational temperature • high thermal conductivity • high production istope cross-section • good diffusion and effusion properties • low adsorbtion enthalpy

  7. Pulsed Beams • HIGHER INSTANTANEOUS RIB INTENSITIES • BETTER SELECTIVITY (BEAM GATE OPERATION) • ANNEALING OF INSTANTANEOUS DEFECTS IN THE REMAINING PORTION OF CYCLE • CREATION OF THERMAL CYCLING GRADIENTS (THERMAL STRESS, PULSED BEAM INDUCED FATIGUE)

  8. Materials

  9. SiC

  10. Al2O3

  11. Materialpreparation at Saint Gobain CREE* JUNE – JULY 2012 ICE-TEMPLATING METHOD (CNRS/SG CREE patent) Open prosity 30 – 70 % *European R&D center of the market leader in SiC production

  12. Experiment 8 samples: (pellets Ø 2 cm x 2 cm) – 4 SiC & 4 Al2O3 Previousexperience – irradiation of SiC and Al2O3at PSI TARPIPE exp. (INJECTOR 2)– good agreement with experimental results Fernandes, S., Thèse 4813 (2010), CERN beam: NORMGPS – 1.4 GeV, 3.2x1013/pulse (2.4 µs/1.2s, 3-4 bunches), σ = 2.3 RaBIT setup (Rapid p-beam Irradiation Transport – a pneaumatic system; shuttles sent in front of HRS front-end) Cooling down period – 1 year beam: SPS – 450 GeV, 4.9x1013/pulse (7.2 µs/18s, 1 – 288 bunches), σ = 2.0 Max. cycles = 100 (desirable 10x more) Setup - 8 samples in a row

  13. porosity 50% Al2O3

  14. porosity 50% SiC

  15. Post-irradiation study at EN/MME-MM EDS SEM • diffusion and segregation of impurities XRD • recrystalisation, • phase transformation • grain size change • pore shrinkage • grain coarsing

  16. THANK YOU

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