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Edge ambipolar potential in toroidal fusion plasmas (Articolo in rivista)

Type

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

Label

Edge ambipolar potential in toroidal fusion plasmas (Articolo in rivista) (literal)

Anno

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

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

10.1063/1.4872173 (literal)

Alternative label

Spizzo G.; Vianello N.; White R.; Abdullaev S.S.; Agostini M.; Cavazzana R.; Ciaccio G.; Puiatti M.E.; Scarin P.; Schmitz O.; Spolaore M.; Terranova D.; RFX Team; TEXTOR Team (2014)
Edge ambipolar potential in toroidal fusion plasmas
in Physics of plasmas; American Institute of Physics, Melville [NY] (Stati Uniti d'America)
(literal)

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

Spizzo G.; Vianello N.; White R.; Abdullaev S.S.; Agostini M.; Cavazzana R.; Ciaccio G.; Puiatti M.E.; Scarin P.; Schmitz O.; Spolaore M.; Terranova D.; RFX Team; TEXTOR Team (literal)

Pagina inizio

056102 (literal)

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

Spizzo G. (reprint author) / Article Number 056102; Physics of plasmas (Online) - Attiva dal: 1994 - Editore: American Institute of Physics - [Woodbury, N.Y.] - Paese di pubblicazione: Stati Uniti d'America - Lingua: inglese - e-Issn: 1089-7674 - Titolo chiave: Physics of plasmas (Online) - Titolo proprio: Physics of plasmas (Online) - Titolo abbreviato: Phys. plasmas (Online). (literal)

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http://scitation.aip.org/content/aip/journal/pop/21/5/10.1063/1.4872173 (literal)

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

21 (literal)

Rivista

Physics of plasmas (Rivista)

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

11 (literal)

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

5 (literal)

Note

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

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

1,2,5,8,9,11,12,13,14 : Consorzio RFX, Euratom-ENEA Association, Istituto Gas Ionizzati Del CNR, 4 35127 Padova, Italy; 3 : Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, NJ 08543, United States; 4,10 : Institut für Energieforschung-Plasmaphysik, Association EURATOM-FZJ, Jülich, Germany; 6 : Consorzio RFX, Euratom-ENEA Association, Corso Stati Uniti, 4, 35127 Padova, Italy; 7 : Dipartimento di Fisica, Università Degli Studi di Padova, Padova, Italy (literal)

Titolo

Edge ambipolar potential in toroidal fusion plasmas (literal)

Abstract

A series of issues with toroidally confined fusion plasmas are related to the generation of 3D flow patterns by means of edge magnetic islands, embedded in a chaotic field and interacting with the wall. These issues include the Greenwald limit in Tokamaks and reversed-field pinches, the collisionality window for ELM mitigation with the resonant magnetic perturbations (RMPs) in Tokamaks, and edge islands interacting with the bootstrap current in stellarators. Measurements of the 2D map of the edge electric field E-r (r = a, theta, phi) in the RFX reversed-field pinch show that E-r has the same helicity of the magnetic islands generated by a m/n perturbation: in fact, defining the helical angle u = m theta - n phi + omega t, maps show a sinusoidal dependence as a function of u, E-r = (E) over tilde (r) sin u. The associated E x B flow displays a huge convective cell with v(a) not equal 0 which, in RFX and near the Greenwald limit, determines a stagnation point for density and a reversal of the sign of E-r. From a theoretical point of view, the question is how a perturbed toroidal flux of symmetry m/n gives rise to an ambipolar potential Phi = (Phi) over tilde sin u. On the basis of a model developed with the guiding center code ORBIT and applied to RFX and the TEXTOR tokamak, we will show that the presence of an m/n perturbation in any kind of device breaks the toroidal symmetry with a drift proportional to the gyroradius rho, thus larger for ions (rho(i) >> rho(e)). Immediately, an ambipolar potential arises to balance the drifts, with the same symmetry as the original perturbation. (literal)

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