http://www.cnr.it/ontology/cnr/individuo/prodotto/ID167922

Pedestal and ELM response to impurity seeding in JET advanced scenario plasmas (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Pedestal and ELM response to impurity seeding in JET advanced scenario plasmas (Articolo in rivista) (literal)

Anno

2008-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1088/0029-5515/48/9/095004 (literal)

Alternative label

M.N.A. Beurskens; G. Arnoux; A.S. Brezinsek; C.D. Challis; P.C. de Vries; C. Giroud; A. Huber; S. Jachmich; K. McCormick; R.A. Pitts; F.G. Rimini; A. Alfier; E. de la Luna; W. Fundamenski; S. Gerasimov; E. Giovannozzi; E. Joffrin; M. Kempenaars; X. Litaudon; T. Loarer; P. Lomas; J. Mailloux; R. Pasqualotto; V. Pericoli-Ridolfini; R. Pugno; E. Rachlew; S. Saarelma; E. Solano; M.Walsh; L. Zabeo; K.-D. Zastrow; JET-EFDA Contributors (2008)
Pedestal and ELM response to impurity seeding in JET advanced scenario plasmas
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; G. Arnoux; A.S. Brezinsek; C.D. Challis; P.C. de Vries; C. Giroud; A. Huber; S. Jachmich; K. McCormick; R.A. Pitts; F.G. Rimini; A. Alfier; E. de la Luna; W. Fundamenski; S. Gerasimov; E. Giovannozzi; E. Joffrin; M. Kempenaars; X. Litaudon; T. Loarer; P. Lomas; J. Mailloux; R. Pasqualotto; V. Pericoli-Ridolfini; R. Pugno; E. Rachlew; S. Saarelma; E. Solano; M.Walsh; L. Zabeo; K.-D. Zastrow; JET-EFDA Contributors (literal)

Pagina inizio

095004 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

48 (literal)

Rivista

Nuclear fusion (Rivista)

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Article Number 095004, Issue 9 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

12 (literal)

Note

ISI Web of Science (WOS) (literal)
Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; Association EURATOM-CEA, CEA/DSM/DRFC-Cadarache 13108, St Paul Durance, France; Assoziationen EURATOM-Forschungszentrum, Julich D-52425 Julich, Germany; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; Association EURATOM-'Belgian State', ERM/KMS, Brussels, Belgium, Partner in the TEC; Association EURATOM-Max-Planck-Institut f¨ur Plasmaphysik, D-85748 Garching, Germany; Association EURATOM, Conferedation Suisse, EPFL, 1015, Lausanne, Switzerland; Association EURATOM-CEA, CEA/DSM/DRFC-Cadarache 13108, St Paul Durance, France; Consorzio RFX-Associazione Euratom-Enea, Corso Stati Uniti 4, I-35127, Padova, Italy; Laboratorio Nacional de Fusion, Asociacion EURATOM-CIEMAT, Madrid, Spain; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; Associazione EURATOM-ENEA, ENEA Centro Ricerche Frascati C.P. 65, 00044, Italy; Association EURATOM-CEA, CEA/DSM/DRFC-Cadarache 13108, St Paul Durance, France; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; Association EURATOM-CEA, CEA/DSM/DRFC-Cadarache 13108, St Paul Durance, France; Association EURATOM-CEA, CEA/DSM/DRFC-Cadarache 13108, St Paul Durance, France; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; Consorzio RFX-Associazione Euratom-Enea, Corso Stati Uniti 4, I-35127, Padova, Italy; Associazione EURATOM-ENEA, ENEA Centro Ricerche Frascati C.P. 65, 00044, Italy; Association EURATOM-Max-Planck-Institut f¨ur Plasmaphysik, D-85748 Garching, Germany; Association EURATOM-VR, Department of Physics, SCI, KTH, SE-10691 Stockholm, Sweden; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; Laboratorio Nacional de Fusion, Asociacion EURATOM-CIEMAT, Madrid, Spain; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK (literal)

Titolo

Pedestal and ELM response to impurity seeding in JET advanced scenario plasmas (literal)

Abstract

Advanced scenario plasmas must often be run at low densities and high power, leading to hot edge temperatures and consequent power handling issues at plasma - surface interaction zones. Experiments at JET are addressing this issue by exploring the use of extrinsic impurity seeding and D(2) puffing to reduce heat fluxes. The experiments presented in this paper continue the line of advanced tokamak ( AT) scenario studies at high triangularity in JET by concentrating on the characterization of the edge pedestal and the ELM behaviour with deuterium and/or light impurity fuelling (neon, nitrogen). Both injection of extrinsic impurities and D2 puffing are shown to have a significant impact on the edge pedestal in typical JET AT conditions. The ELM energy loss, Delta W(ELM)/W(dia), can be reduced to below 3% and the maximum ELM penetration depth can be limited to r/a > 0.7, thus enhancing the possibility for sustainable internal transport barriers at large plasma radius. These conditions can be achieved in two separate domains, either at a radiated power fraction (F(rad)) of 30% or at a fraction of > 50%. At the lower Frad the ELMs are type I and a high pedestal pressure is maintained, but the occasional large ELM may still occur. At F(rad) > 50% the pedestal pressure is degraded by 30-50%, but the ELMs are degraded to type III. The intermediate regime at F(rad) similar to 40% is unattractive for ITB scenarios because large type I ELMs occur intermittently during the predominantly type III ELM phases (compound type I/III). F(rad) = 30% can be obtained with D(2) fuelling alone, whereas neon or nitrogen seeding is needed to achieve F(rad) > 50%. Only a limited number of tests have been carried out with nitrogen seeding, with the preliminary conclusion that the plasma edge behaviour is similar to that with neon seeding once the radiated fraction is matched. (literal)

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