Edge ambipolar potential in toroidal fusion plasmas (Abstract/Comunicazione in atti di convegno)

Type
Label
  • Edge ambipolar potential in toroidal fusion plasmas (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • Gianluca Spizzo (2013)
    Edge ambipolar potential in toroidal fusion plasmas
    in 55th Annual Meeting of the APS Division of Plasma Physics, Denver, Colorado, USA, November 11-15, 2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Gianluca Spizzo (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Invited Oral - Session YI2: Edge and Pedestal; Abstract ID: BAPS.2013.DPP.YI2.4. Il periodico esiste dal 1925, con ISSN 0003-0503, come risulta dal record ACNP. Il record ISSN invece non è attualizzato. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://meetings.aps.org/Meeting/DPP13/Event/201580 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • Bulletin of the American Physical Society - 55th Annual Meeting of the APS Division of Plasma Physics (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#volumeInCollana
  • 58/16 (literal)
Note
  • Comunicazione (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Consorzio RFX, Euratom-ENEA Association, Corso Stati Uniti, 4 35127 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 (RFP), 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 Er(r=a,?,?) in the RFX RFP show that Er has the same helicity of the magnetic islands generated by a m/n perturbation: in fact, defining the helical angle u=m?-n?+?t, maps show a sinusoidal dependence as a function of u, Er=E~rsinu. The associated E×B flow displays a huge convective cell with v(a)?0 which, in RFX and near the Greenwald limit, determines a stagnation point for density and a reversal of the sign of Er. Similar reversal of Er at high collisionality is found also in Alcator C-mod. From a theoretical point of view, the question is how a perturbed toroidal flux of symmetry m/n gives rise to an ambipolar potential ?=?~sinu. On the basis of a model developed with the guiding center code ORBIT and applied to RFX and TEXTOR, we will show that the presence of a m/n perturbation \textit{in any kind of device} breaks the toroidal simmetry with a drift proportional to the gyroradius ?, thus larger for ions (?i>>?e). Immediately an ambipolar potential arises to balance the drifts, with the same symmetry as the original perturbation. (literal)
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