0000000000422257

AUTHOR

J.p. Coad

showing 3 related works from this author

Structural changes and distribution of accumulated tritium in the carbon based JET tiles

2011

Abstract In this study the tritium distribution and the effect of structural changes thereon have been analyzed in the bulk of the tile selected from the JET Mark II SRP divertor. Tritium content has been analyzed by the full combustion technique [1] . The structure has been investigated by the method of Scanning Electron Microscopy. Tritium depth profiles have been measured at different poloidal positions. A high specific activity of tritium (up to 156 MBq g −1 ) was found at the plasma-facing surface. At some tile positions up to 98–99% of the T can be in the surface slice of 1 mm thickness, whereas in other poloidal positions there can be more T in the bulk than at the surface. The struc…

Nuclear and High Energy PhysicsJet (fluid)ChemistryScanning electron microscopeDivertorAnalytical chemistrychemistry.chemical_elementCombustionNuclear Energy and Engineeringvisual_artvisual_art.visual_art_mediumGeneral Materials ScienceTritiumWaferTileCarbonJournal of Nuclear Materials
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Overview of the JET results in support to ITER

2017

The 2014–2016 JET results are reviewed in the light of their significance for optimising the ITER research plan for the active and non-active operation. More than 60 h of plasma operation with ITER first wall materials successfully took place since its installation in 2011. New multi-machine scaling of the type I-ELM divertor energy flux density to ITER is supported by first principle modelling. ITER relevant disruption experiments and first principle modelling are reported with a set of three disruption mitigation valves mimicking the ITER setup. Insights of the L–H power threshold in Deuterium and Hydrogen are given, stressing the importance of the magnetic configurations and the recent m…

Technologyfusion:Física [Ciências exactas e naturais]TokamakNuclear engineeringDIAGNOSTICS01 natural sciencesILW010305 fluids & plasmaslaw.inventionIlw[SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]PlasmaH-Mode PlasmaslawITERDisruption PredictionCOLLISIONALITYEDGE LOCALIZED MODESDiagnosticsOperationfusion; ITER; JET; plasma; Nuclear and High Energy Physics; Condensed Matter PhysicsPhysicsJet (fluid)JET plasma fusion ITERDivertorSettore FIS/01 - Fisica SperimentaleCondensed Matter PhysicsFusion Plasma and Space PhysicsDENSITY PEAKINGCarbon WallH-MODE PLASMAS[ SPI.MECA.MEFL ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]Density PeakingNuclear and High Energy PhysicsNeutron transportFacing ComponentsCollisionality114 Physical sciencesFísica FísicaNuclear physics:Physical sciences [Natural sciences]Fusion plasma och rymdfysikPedestal0103 physical sciencesNuclear fusionddc:530Neutron010306 general physicsFusionplasmaPhysics Physical sciencesNuclear and High Energy PhysicEdge Localized ModesQC717:Física [Àrees temàtiques de la UPC]Reactors de fusióFísicaFACING COMPONENTSFusion reactorsJetJETCARBON WALLDISRUPTION PREDICTIONOPERATIONddc:600Collisionality
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Fuel inventory and material migration of JET main chamber plasma facing components compared over three operational periods

2020

Fuel retention and material migration results from JET ITER-like wall beryllium limiter tiles are presented for three operating periods. Ion beam analysis results support the general picture of erosion during limiter configurations with local deposition on tile ends far into the scrape off layer. Similar trends of fuel concentrations are observed in all JET operating periods; (i) low on surfaces exposed to high heat flux and erosion and (ii) higher in deposits. The pattern of fuel retention and deposition correlates with heat flux and distribution of limiter plasmas touching inner and outer limiters. The D/Be ratio in the thickest deposit is similar to 0.01. Global fuel retention attributed…

DESORPTIONMaterials scienceEROSIONJET ITER-like wallchemistry.chemical_element01 natural sciences114 Physical sciences010305 fluids & plasmasmaterial migrationDesorption0103 physical sciencesDEPOSITION010306 general physicsMathematical PhysicsJet (fluid)ITER-LIKE-WALLDivertorMetallurgyPlasmaCondensed Matter PhysicsberylliumAtomic and Molecular Physics and Opticsfuel retentionchemistryINNER WALLErosionDIVERTORBerylliumDeposition (chemistry)
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