Pedestal and scrape-off layer dynamics in ELMy H-mode plasmas in JET (Articolo in rivista)

Type
Label
  • Pedestal and scrape-off layer dynamics in ELMy H-mode plasmas in JET (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0029-5515/49/12/125006 (literal)
Alternative label
  • M.N.A. Beurskens; A. Alfier; B. Alper; I. Balboa; J. Flanagan; W. Fundamenski; E. Giovannozzi; M. Kempenaars; A. Loarte; P. Lomas; E. de La Luna; I. Nunes; R. Pasqualotto; R.A. Pitts; G. Saibene; M. Walsh; S.Wiesen; JET-EFDA contributors (2009)
    Pedestal and scrape-off layer dynamics in ELMy H-mode plasmas in JET
    in Nuclear fusion; IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M.N.A. Beurskens; A. Alfier; B. Alper; I. Balboa; J. Flanagan; W. Fundamenski; E. Giovannozzi; M. Kempenaars; A. Loarte; P. Lomas; E. de La Luna; I. Nunes; R. Pasqualotto; R.A. Pitts; G. Saibene; M. Walsh; S.Wiesen; JET-EFDA contributors (literal)
Pagina inizio
  • 125006 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 49 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Article Number 125004, Issue 12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 13 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; Associazione EURATOM-ENEA sulla Fusione, Consorzio RFX Padova, Italy; EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; Associazione EURATOM-ENEA sulla Fusione, C.R. Frascati, Frascati, Italy; EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; ITER Organization, CS 90 046, F-13067 Saint Paul lez Durance Cedex, France; EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; Associacion EURATOM-CIEMAT para Fusion, Madrid, Spain; Centro de Fusao Nuclear, Associacao EURATOM-IST, Lisboa, Portugal; Associazione EURATOM-ENEA sulla Fusione, Consorzio RFX Padova, Italy; ITER Organization, CS 90 046, F-13067 Saint Paul lez Durance Cedex, France; FUSION FOR ENERGY Joint Undertaking, 08019 Barcelona, Spain; EURATOM/UKAEA Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK; Association EURATOM-FZ Julich, Trilateral Euregio Cluster, D-52425 Julich, Germany (literal)
Titolo
  • Pedestal and scrape-off layer dynamics in ELMy H-mode plasmas in JET (literal)
Abstract
  • Pedestal and scrape-off layer (SOL) dynamics due to edge localized modes (ELMs) have been studied on JET with improved diagnostic capability. The new high resolution Thomson scattering system enables detailed measurement of the space and time evolution of the T(e) and ne pedestal profiles. The pedestal and SOL dynamics for type I ELMy H-mode plasmas have been studied for a wide range of plasma conditions. During a short period of <200 mu s after the ELM event radial profiles of filaments in the SOL electron density and temperature have been observed. After that period the SOL density is increased and remains high for several milliseconds. During the same period the electron temperature shows no increase compared with the pre-ELM values. This SOL dynamics has been observed for a wide range of plasma parameters and is independent of plasma pedestal collisionality. For the first time on JET the convective and conductive ELM energy losses have been quantified using the new kinetic profile measurements. The findings provide detailed confirmation of earlier observations based on different measurements and analysis. The pedestal region perturbed by the ELM is the same for both density and temperature and the ELM effect extends up to about 20% of minor radius. The convective energy losses do not vary significantly and are similar to 5% of the pedestal stored energy (W(ped)) over a large range of pedestal collisionality nu(e)* from below nu(e)* = 0.1 to above nu(e)* = 0.5 whereas the conductive losses strongly decrease from similar to 20% of W(ped) to 5% of W(ped) with increasing nu(e)*. The experimental observations are compared with a simple model based on losses being driven by parallel transport. (literal)
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