0000000000337654

AUTHOR

R. Knitter

showing 4 related works from this author

Behaviour of advanced tritium breeder pebbles under simultaneous action of accelerated electrons and high temperature

2017

The authors greatly acknowledge the technical and experimen-tal support of O. Valtenbergs and L. Avotina (Institute of Chemical Physics, University of Latvia). The work is performed in the frames of the University of Latvia financed project No. Y9-B044-ZF-N-300, “Nano, Quantum Technologies, and Innovative Materials for Eco-nomics”.

Materials scienceScanning electron microscopeAnalytical chemistrychemistry.chemical_element01 natural sciences7. Clean energy010305 fluids & plasmaslaw.inventionchemistry.chemical_compoundBreeder (animal)law0103 physical sciencesRadiolysis:NATURAL SCIENCES:Physics [Research Subject Categories]Tritium breeding ceramicGeneral Materials ScienceIrradiationElectron paramagnetic resonanceCivil and Structural Engineering010302 applied physicsMechanical EngineeringLithium orthosilicateMicrostructureNuclear Energy and EngineeringchemistryTritiumLithiumOrthosilicateLithium metatitanateFusion Engineering and Design
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Characterisation and radiolysis of modified lithium orthosilicate pebbles with noble metal impurities

2017

Modified lithium orthosilicate (Li4SiO4) pebbles with additions of titanium dioxide (TiO2) are suggested as an alternative tritium breeding ceramic for the European solid breeder test blanket module. The noble metals – platinum (Pt), gold (Au) and rhodium (Rh), can be introduced into the modified Li4SiO4 pebbles during the melt-based process, due to the corrosion of Pt-Rh and Pt-Au alloy crucible components. In this study, the surface microstructure, chemical and phase composition of the modified Li4SiO4 pebbles with different contents of the noble metals was analysed. The influence of the noble metals on the radiolysis was evaluated after irradiation with accelerated electrons (E = 5 MeV),…

Materials scienceInorganic chemistryAlloychemistry.chemical_element02 engineering and technologyengineering.material01 natural sciences010305 fluids & plasmasRhodiumchemistry.chemical_compoundImpurity0103 physical sciencesRadiolysisTritium breeding ceramicGeneral Materials ScienceCivil and Structural EngineeringMechanical EngineeringNoble metalsLithium orthosilicate021001 nanoscience & nanotechnologyNuclear Energy and EngineeringchemistryRadiolysisengineeringNoble metalLithiumOrthosilicate0210 nano-technologyPlatinum
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Status of ceramic breeder pebble bed thermo-mechanics R&D and impact on breeder material mechanical strength

2012

Abstract Among the international fusion solid breeder blanket community, there exists steady progress on the experimental, phenomenological, and numerical characterizations of the pebble bed effective thermo physical and mechanical properties, and of thermomechanic state of the bed under prototypical operating conditions. This paper summarizes recent achievements in pebble bed thermomechanics that were carried out by members of the IEA Fusion Nuclear Technology Subtask I Solid Breeding Blanket. A major goal is on developing predictive capability while identifying a pre-conditioned equilibrium stress state that would warrant pebble bed integrity during operations. The paper reviews and synth…

Computer scienceMechanical EngineeringNuclear engineeringPredictive capabilityBlanketCeramic breeder Pebble bed Thermomechanics Phenomenological models Solid breeder blanket designBreeder (animal)Nuclear Energy and Engineeringvisual_artBenchmark (surveying)Mechanical strengthvisual_art.visual_art_mediumGeneral Materials ScienceCeramicPebbleSettore ING-IND/19 - Impianti NucleariCivil and Structural Engineering
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Accumulation of radiation defects and products of radiolysis in lithium orthosilicate pebbles with silicon dioxide additions under action of high abs…

2012

Abstract One of the technological problems of a fusion reactor is the change in composition and structure of ceramic breeders (Li 4 SiO 4 or Li 2 TiO 3 pebbles) during long-term operation. In this study changes in the composition and microstructure of Li 4 SiO 4 pebbles with 2.5 wt% silicon dioxide additions, fabricated by a melt-spraying process, were investigated after fast electron irradiation ( E  = 5 MeV, dose rate up to 88 MGy h −1 ) with high absorbed dose from 1.3 to 10.6 GGy at high temperature (543–573 K) in air and argon atmosphere. Three types of pebbles with different diameters and grain sizes were investigated. Products of radiolysis were studied by means of FTIR and XRD. TSL …

Nuclear and High Energy PhysicsLithium metasilicateMaterials scienceArgonRadiochemistrychemistry.chemical_elementchemistry.chemical_compoundNuclear Energy and EngineeringchemistryChemical engineeringRadiolysisElectron beam processingGeneral Materials ScienceLithiumIrradiationOrthosilicateInert gasJournal of Nuclear Materials
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