http://www.cnr.it/ontology/cnr/individuo/prodotto/ID283136

Tungsten transport in JET H-mode plasmas in hybrid scenario, experimental observations and modelling (Articolo in rivista)

Type

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

Label

Tungsten transport in JET H-mode plasmas in hybrid scenario, experimental observations and modelling (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

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

10.1088/0029-5515/54/8/083028 (literal)

Alternative label

Angioni C.; Mantica P.; Pütterich T.; Valisa M.; Baruzzo M.; Belli E.A.; Belo P.; Casson F.J.; Challis C.; Drewelow P.; Giroud C.; Hawkes N.; Hender T.C.; Hobirk J.; Koskela T.; Lauro Taroni L.; Maggi C.F.; Mlynar J.; Odstrcil T.; Reinke M.L.; Romanelli M.; JET EFDA Contributors (2014)
Tungsten transport in JET H-mode plasmas in hybrid scenario, experimental observations and modelling
in Nuclear fusion; International Atomic Energy Agency, Vienna (Austria); IOP PUBLISHING LTD, BRISTOL BS1 6BE (Regno Unito)
(literal)

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

Angioni C.; Mantica P.; Pütterich T.; Valisa M.; Baruzzo M.; Belli E.A.; Belo P.; Casson F.J.; Challis C.; Drewelow P.; Giroud C.; Hawkes N.; Hender T.C.; Hobirk J.; Koskela T.; Lauro Taroni L.; Maggi C.F.; Mlynar J.; Odstrcil T.; Reinke M.L.; Romanelli M.; JET EFDA Contributors (literal)

Pagina inizio

083028 (literal)

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

Article Number: 083028; / Nuclear fusion (Online) Attiva dal: 1992, Editore: Institute of Physics Publishing - Bristol, Paese di pubblicazione: Regno Unito Lingua: inglese, e-Issn: 1741-4326, Titolo chiave: Nuclear fusion (Online) Titolo proprio: Nuclear fusion. (Online), Titolo abbreviato: Nucl. fus. (Online) / http://www.scopus.com/inward/record.url?eid=2-s2.0-84904959796&partnerID=q2rCbXpz (literal)

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

http://iopscience.iop.org/0029-5515/54/8/083028/ (literal)

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

54 (literal)

Rivista

Nuclear fusion (Rivista)

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

26 (literal)

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

8 (literal)

Note

Scopu (literal)

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

JET-EFDA, Culham Science Centre, Abingdon OX14 3DB, United Kingdom; / 1,3,14,17,19 : Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany; / 2 : Istituto di Fisica Del Plasma, CNR/ENEA, Milano, Italy; / 4,5,16 : Consorzio RFX-CNR/ENEA, I-35127 Padova, Italy; / 6 : General Atomics, PO Box 85608, San Diego, CA 92186-5608, United States; / 7 : Instituto de Plasma e Fusão Nuclear, IST, Lisbon, Portugal; / 8,9,11-13,21 : CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom; / 10 : Max-Planck Institut für Plasmaphysik, Greifswald, Germany; / 15 : Aalto University, Association EURATOM-Tekes, PO Box 14100, FIN-00076 Aalto, Finland; / 18 : IPP.CR, Inst. of Plasma Physics AS CR, Prague, Czech Republic; / 20 : Department of Physics, University of York, Heslington, YO10 5DD, York, United Kingdom; 22 : See the appendix of Romanelli F. et al 2012 Proc. 24th IAEA Fusion Energy Conf. 2012 (San Diego, CA, 2012)(www-naweb.iaea.org/napc/physics/FEC/FEC2012/index.htm). (literal)

Titolo

Tungsten transport in JET H-mode plasmas in hybrid scenario, experimental observations and modelling (literal)

Abstract

The behaviour of tungsten in the core of hybrid scenario plasmas in JET with the ITER-like wall is analysed and modelled with a combination of neoclassical and gyrokinetic codes. In these discharges, good confinement conditions can be maintained only for the first 2-3s of the high power phase. Later W accumulation is regularly observed, often accompanied by the onset of magneto-hydrodynamical activity, in particular neoclassical tearing modes (NTMs), both of which have detrimental effects on the global energy confinement. The dynamics of the accumulation process is examined, taking into consideration the concurrent evolution of the background plasma profiles, and the possible onset of NTMs. Two time slices of a representative discharge, before and during the accumulation process, are analysed with two independent methods, in order to reconstruct the W density distribution over the poloidal cross-section. The same time slices are modelled, computing both neoclassical and turbulent transport components and consistently including the impact of centrifugal effects, which can be significant in these plasmas, and strongly enhance W neoclassical transport. The modelling closely reproduces the observations and identifies inward neoclassical convection due to the density peaking of the bulk plasma in the central region as the main cause of the accumulation. The change in W neoclassical convection is directly produced by the transient behaviour of the main plasma density profile, which is hollow in the central region in the initial part of the high power phase of the discharge, but which develops a significant density peaking very close to the magnetic axis in the later phase. The analysis of a large set of discharges provides clear indications that this effect is generic in this scenario. The unfavourable impact of the onset of NTMs on the W behaviour, observed in several discharges, is suggested to be a consequence of a detrimental combination of the effects of neoclassical transport and of the appearance of an island. (literal)

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