http://www.cnr.it/ontology/cnr/individuo/prodotto/ID25942

JET ((3)He)-D scenarios relying on RF heating: survey of selected recent experiments (Articolo in rivista)

Type

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

Label

JET ((3)He)-D scenarios relying on RF heating: survey of selected recent experiments (Articolo in rivista) (literal)

Anno

2009-01-01T00:00:00+01:00 (literal)

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

10.1088/0741-3335/51/4/044007 (literal)

Alternative label

D Van Eester; E Lerche; Y Andrew; T M Biewer; A Casati; K Crombé; E de la Luna; G Ericsson; R Felton; L Giacomelli; C Giroud; N Hawkes; C Hellesen; A Hjalmarsso; E Joffrin; J Källne; V Kiptily; P Lomas; P Mantica; A Marinoni; M-L Mayoral; J Ongena; M-E Puiatti; M Santala; S Sharapov;M Valisa; and JET EFDA contributors (2009)
JET ((3)He)-D scenarios relying on RF heating: survey of selected recent experiments
in Plasma physics and controlled fusion (Print); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
(literal)

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

D Van Eester; E Lerche; Y Andrew; T M Biewer; A Casati; K Crombé; E de la Luna; G Ericsson; R Felton; L Giacomelli; C Giroud; N Hawkes; C Hellesen; A Hjalmarsso; E Joffrin; J Källne; V Kiptily; P Lomas; P Mantica; A Marinoni; M-L Mayoral; J Ongena; M-E Puiatti; M Santala; S Sharapov;M Valisa; and JET EFDA contributors (literal)

Pagina inizio

044007 (literal)

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

51 (literal)

Rivista

Plasma physics and controlled fusion (Rivista)

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

Article Number 044007, Issue 4 (literal)

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

31 (literal)

Note

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

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

JET-EFDA Culham Science Centre, Abingdon, OX14 3DB, UK / Laboratory for Plasma Physics-ERM/KMS, TEC Partner, Brussels, Belgium / Euratom-UKAEA Fusion Association, Culham Science Centre, UK / Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA / CEA/DRFC Assoc. Euratom-CEA, Cadarache, France / Department of Applied Physics, Ghent University, Ghent, Belgium / Laboratorio Nacional de Fusion, Asociación EURATOM-CIEMAT, CIEMAT, Madrid, Spain / Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden / Department of Engineering Sciences, Uppsala University, Uppsala, Sweden / Istituto di Fisica del Plasma, Assoc. Euratom-ENEA-CNR, Milano, Italy / CRPP-EPFL, Assoc. Euratom Confédération Suisse, CH-1015, Lausanne, Switzerland / Consorzio RFX, Euratom-ENEA Association, Padova, Italy (literal)

Titolo

JET ((3)He)-D scenarios relying on RF heating: survey of selected recent experiments (literal)

Abstract

Recent JET experiments have been devoted to the study of ((3)He)-D plasmas involving radio frequency (RF) heating. This paper starts by discussing the RF heating efficiency theoretically expected in such plasmas, covering both relevant aspects of wave and of particle dynamics. Then it gives a concise summary of the main conclusions drawn from recent experiments that were either focusing on studying RF heating physics aspects or that were adopting RF heating as a tool to study plasma behavior. Depending on the minority concentration chosen, different physical phenomena are observed. At very low concentration (X[(3)He] < 1%), energetic tails are formed which trigger MHD activity and result in loss of fast particles. Alfven cascades were observed and gamma ray tomography indirectly shows the impact of sawtooth crashes on the fast particle orbits. Low concentration (X[(3)He] < 10%) favors minority heating while for X[(3)He] >> 10% electron mode conversion damping becomes dominant. Evidence for the Fuchs et al standing wave effect (Fuchs et al 1995 Phys. Plasmas 2 1637-47) on the absorption is presented. RF induced deuterium tails were observed in mode conversion experiments with large X[(3)He] (approximate to 18%). As tentative modeling shows, the formation of these tails can be explained as a consequence of wave power absorption by neutral beam particles that efficiently interact with the waves well away from the cold D cyclotron resonance position as a result of their substantial Doppler shift. As both ion and electron RF power deposition profiles in ((3)He)-D plasmas are fairly narrow-giving rise to localized heat sources-the RF heating method is an ideal tool for performing transport studies. Various of the experiments discussed here were done in plasmas with internal transport barriers (ITBs). ITBs are identified as regions with locally reduced diffusivity, where poloidal spinning up of the plasma is observed. The present know-how on the role of RF heating for impurity transport is also briefly summarized. (literal)

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