http://www.cnr.it/ontology/cnr/individuo/prodotto/ID26272

MHD induced fast-ion losses on ASDEX Upgrade (Articolo in rivista)

Type

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

Label

MHD induced fast-ion losses on ASDEX Upgrade (Articolo in rivista) (literal)

Anno

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

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

10.1088/0029-5515/49/8/085014 (literal)

Alternative label

M. García-Muñoz; H.-U. Fahrbach; S.D. Pinches; V. Bobkov; M. Brüdgam; M. Gobbin; S. Günter; V. Igochine; Ph. Lauber; M.J. Mantsinen; M. Maraschek; L. Marrelli; P. Martin; P. Piovesan; E. Poli; K. Sassenberg; G. Tardini; H. Zohm; the ASDEX Upgrade Team (2009)
MHD induced fast-ion losses on ASDEX Upgrade
in Nuclear fusion
(literal)

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

M. García-Muñoz; H.-U. Fahrbach; S.D. Pinches; V. Bobkov; M. Brüdgam; M. Gobbin; S. Günter; V. Igochine; Ph. Lauber; M.J. Mantsinen; M. Maraschek; L. Marrelli; P. Martin; P. Piovesan; E. Poli; K. Sassenberg; G. Tardini; H. Zohm; the ASDEX Upgrade Team (literal)

Pagina inizio

085014 (literal)

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

49 (literal)

Rivista

Nuclear fusion (Rivista)

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

Article Number 085014, Issue 8 (literal)

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

11 (literal)

Note

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

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

Max-Planck-Institut für Plasmaphysik, EURATOM Association Boltzmannstrasse 2, D-85748 Garching, Germany / Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, UK / Consorzio RFX, Associazione EURATOM-ENEA per la fusione, Padova, Italy / Physics Department, University of Padova, Italy / Helsinki Univ. of Technology, Association Euratom-Tekes, PO Box 4100, FIN-02015 HUT, Finland / University College Cork, Association EURATOM-DCU, Cork, Ireland (literal)

Titolo

MHD induced fast-ion losses on ASDEX Upgrade (literal)

Abstract

A detailed knowledge of the interplay between MHD instabilities and energetic particles has been gained from direct measurements of fast-ion losses (FILs). Time-resolved energy and pitch angle measurements of FIL caused by neoclassical tearing modes (NTMs) and toroidicity-induced Alfven eigenmodes (TAEs) have been obtained using a scintillator based FIL detector. The study of FIL due to TAEs has revealed the existence of a new core-localized MHD fluctuation, the Sierpes mode. The Sierpes mode is a non-pure Alfvenic fluctuation which appears in the acoustic branch, dominating the transport of fast-ions in ICRF heated discharges. The internal structure of both TAEs and Sierpes mode has been reconstructed by means of highly resolved multichord soft x-ray measurements. A spatial overlapping of their eigenfunctions leads to a FIL coupling, showing the strong influence that a core-localized fast-ion driven MHD instability may have on the fast-ion transport. We have identified the FIL mechanisms due to NTMs as well as due to TAEs. Drift islands formed by fast-ions in particle phase space are responsible for the loss of NBI fast-ions due to NTMs. In ICRF heated plasmas, a resonance condition fulfilled by the characteristic trapped fast-ion orbit frequencies leads to a phase matching between fast-ion orbit and NTM or TAE magnetic fluctuation. The banana tips of a resonant trapped fast-ion bounce radially due to an E x B drift in the TAE case. The NTM radial bounce of the fast-ion banana tips is caused by the radial component of the perturbed magnetic field lines. (literal)

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