Particle transport in low core turbulence Tore-Supra plasmas

Electron and impurity transport has been studied in sawtoothing plasmas in the Tore-Supra tokamak. High time and space resolution measurements of the electron density reveal the existence of a flat profile region encompassing the q = 1 surface, on which is superimposed a density peak building up bet...

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Bibliographic Details
Published in:Nuclear fusion 2010-09, Vol.50 (9), p.095009-095009
Main Authors: Guirlet, R, Sirinelli, A, Parisot, T, Sabot, R, Artaud, J.F, Bourdelle, C, Garbet, X, Hennequin, P, Hoang, G.T, Imbeaux, F, Ségui, J.L, Mazon, D, Villegas, D
Format: Article
Language:English
Subjects:
Density
Exact sciences and technology
Fluid dynamics
Fluid flow
Magnetic confinement and equilibrium
Mathematical analysis
Nickel
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma Physics
Plasma properties
Plasma turbulence
Plasmas
Tokamaks
Transport
Transport properties
Turbulence
Turbulent flow
Waves, oscillations, and instabilities in plasmas and intense beams
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Summary:Electron and impurity transport has been studied in sawtoothing plasmas in the Tore-Supra tokamak. High time and space resolution measurements of the electron density reveal the existence of a flat profile region encompassing the q = 1 surface, on which is superimposed a density peak building up between sawtooth relaxations. For the first time in this regime, we have determined the underlying transport of both nickel and electrons independently of the effect of sawteeth in the central part of the plasma. Electron transport is consistent with the neoclassical expectations only in the close vicinity of the magnetic axis. Further out, it exceeds the neoclassical values as calculated with the NCLASS code, although the turbulence level is very low in the whole central region region. In contrast, nickel transport is in good agreement with the neoclassical calculations in the same region. The neoclassical effect on trapped particles of a persisting mode due to incomplete reconnection of the magnetic surfaces is consistent with these observations.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/50/9/095009