tests at hiradmat of advanced sic and al 2 o 3 as model targets for radioisotope beam production...
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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
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• 2010 - Sandrina Fernandes’ 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
History of the project:
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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-templating
method) to understand how beam energy impacts ageing (causing
decrease of good release efficiencies of ISOLDE targets)
Goal of the proposal :
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Marie Curie Initial Training Network
CATHI(Cryogenics, Accelerators and Targets at HIE ISOLDE)
ESR 8Target Material Studies
Ageing under pulsed beams
Michal Czapski (EN/STI-RBS and EN/MME-MM*)
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Diffusion
Effusion
Ionization
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Target properties
• high production istope cross-section
• good diffusion and effusion properties
• low adsorbtion enthalpy
• high resistance to radiation damage
• limited sintering and ageing
• high operational temperature
• high thermal conductivity
ISOTOPE PRODUCTION MECHANICAL PROPERTIES
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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)
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Materials
SiC Al2O3
• radiation resistance• high thermal conductivity• high thermal shock
resistance• high-strength• high-hardness• good chemical properties
• good thermo-chemical stability
• high thermal conductivity• stable in air and oxidation
atmosphere
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SiC
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Al2O3
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Material preparation at Saint Gobain CREE*
ICE-TEMPLATING METHOD(CNRS/SG CREE patent)
Open prosity 30 – 70 %
*European R&D center of the market leader in SiC production
JUNE – JULY 2012
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Experiment8 samples: (pellets Ø 2 cm x 2 cm) – 4 SiC & 4 Al2O3
beam: NORMGPS – 1.4 GeV, 3.2x1013/pulse (2.4 µs/1.2s, 3-4 bunches), σ = 2.3RaBIT setup (Rapid p-beam Irradiation Transport – a pneaumatic system; shuttles sent in front of HRS front-end)
beam: SPS – 450 GeV, 4.9x1013/pulse (7.2 µs/18s, 1 – 288 bunches), σ = 2.0Max. cycles = 100 (desirable 10x more)Setup - 8 samples in a row
Previous experience – irradiation of SiC and Al2O3 at PSI
TARPIPE exp. (INJECTOR 2) – good agreement with experimental results
Fernandes, S., Thèse 4813 (2010), CERN
Cooling down period – 1 year
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Post-irradiation studyat EN/MME-MM
EDS
SEM
XRD
Irradiation assisted stress corrosion
cracking
Microstructural changes
Microcompositional effects:
• recrystalisation, • phase
transformation • grain size change• pore shrinkage• grain coarsing
diffusion and segregation of impurities