0000000001255413

AUTHOR

J. Graves

showing 3 related works from this author

Overview of the JET results

2015

Since the installation of an ITER-like wall, the JET programme has focused on the consolidation of ITER design choices and the preparation for ITER operation, with a specific emphasis given to the bulk tungsten melt experiment, which has been crucial for the final decision on the material choice for the day-one tungsten divertor in ITER. Integrated scenarios have been progressed with the re-establishment of long-pulse, high-confinement H-modes by optimizing the magnetic configuration and the use of ICRH to avoid tungsten impurity accumulation. Stationary discharges with detached divertor conditions and small edge localized modes have been demonstrated by nitrogen seeding. The differences in…

Chemical analysiMagnetic confinementEdge localized modeTokamak:Física [Ciências exactas e naturais]Nuclear engineeringplasma-facing componentsTungsten7. Clean energyiter-like walllaw.inventionheat loadsAlcator C-ModlawPlasma-facing componentalcator C-MODQCPhysicsJet (fluid)Thermally activatedDivertormagnetic confinementMagnetic confinement fusionTokamak deviceerosionCondensed Matter PhysicsChemical erosionPost mortem analysiCondensed Matter Physics; Nuclear and High Energy PhysicsBerylliumAtomic physicstokamaksTokamaksNuclear and High Energy Physicschemistry.chemical_elementImpurity accumulationCondensed Matter PhysicNuclear and High Energy Physics; Condensed Matter PhysicsTungstenFísica Física:Physical sciences [Natural sciences]divertorNuclear fusionNuclear and High Energy PhysicPhysics Physical sciencesGas fuel analysifuel retentionSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)operationOrders of magnitudechemistryJETtransportMagnetic configuration
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Overview of the JET results with the ITER-like wall

2013

Following the completion in May 2011 of the shutdown for the installation of the beryllium wall and the tungsten divertor, the first set of JET campaigns have addressed the investigation of the retention properties and the development of operational scenarios with the new plasma-facing materials. The large reduction in the carbon content (more than a factor ten) led to a much lower Zeff (1.2-1.4) during L- and H-mode plasmas, and radiation during the burn-through phase of the plasma initiation with the consequence that breakdown failures are almost absent. Gas balance experiments have shown that the fuel retention rate with the new wall is substantially reduced with respect to the C wall. T…

Nuclear and High Energy PhysicsMaterials scienceREGIMENuclear engineeringchemistry.chemical_element-Condensed Matter PhysicEffective radiated powerTungstenNuclear and High Energy Physics; Condensed Matter PhysicsPedestalPLASMA-FACING COMPONENTSTOKAMAK PLASMASJet (fluid)TUNGSTENDivertorperfomancePlasmaPERFORMANCECondensed Matter PhysicsSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)chemistryBeta (plasma physics)DIVERTORBerylliumAtomic physics
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Modelling of JET hybrid plasmas with emphasis on performance of combined ICRF and NBI heating

2018

International audience; During the 2015--2016 JET campaigns, many efforts have been devoted to the exploration of high-performance plasma scenarios envisaged for DT operation in JET. In this paper, we review various key recent hybrid discharges and model the combined ICRF NBI heating. These deuterium discharges with deuterium beams had the ICRF antenna frequency tuned to match the cyclotron frequency of minority H at the centre of the tokamak coinciding with the second harmonic cyclotron resonance of D. The modelling takes into account the synergy between ICRF and NBI heating through the second harmonic cyclotron resonance of D beam ions, allowing us to assess its impact on the neutron rate…

Nuclear and High Energy PhysicsLight nucleusfusionPlasma heatingicrf heatingNuclear engineeringion-cyclotron rangeCyclotronJET hybrid plasmaICRF heating; NBI heating; JET hybrid plasmas; fusion enhancement; ION-CYCLOTRON RANGE; ENHANCEMENT; FUSION7. Clean energy01 natural sciences010305 fluids & plasmaslaw.inventionICRF heatingfusion enhancementdt plasmaslawNBI heating0103 physical sciences010306 general physicsjet hybrid plasmastokamakenhancementfusion enhancement; ICRF heating; JET hybrid plasmas; NBI heatingnbi heatingJet (fluid)Emphasis (telecommunications)PlasmaCondensed Matter PhysicsJET hybrid plasmasSettore ING-IND/20 - Misure e Strumentazione NucleariresonanceEnvironmental science[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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