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Turbulence and energy confinement in TORE SUPRA ohmic discharges

Technical Report:

Abstract

Results on confinement and turbulence from a set of ohmic discharges in Tore Supra are discussed. The attention is focused on the saturation of the energy confinement time and it is emphasized that this saturation could be explained by a saturation of the electron heat diffusivity. Ion behaviour is indeed governed by dilution and equipartition effects. Although the ion heat transport is never neoclassical, there is no enhanced degradation at the saturation. This behaviour is confirmed by turbulence measurements given by CO{sub 2} laser coherent scattering. The density fluctuations level follows the electron heat diffusivity variations with the average density. Waves propagating in the ion diamagnetic direction are always present in turbulence frequency spectra. Thus, the saturation cannot be explained by the onset of an ion turbulence. The existence of an ion turbulence at the edge at all densities cannot be excluded. However, this ion feature in scattering spectra could be explained by a Doppler shift associated to an inversion point of the radial electric field at the edge.
Authors:
Garbet, X; Payan, J; Laviron, C; Devynck, P; Saha, S K; Capes, H; Chen, X P; Coulon, J P; Gil, C; Harris, G; Hutter, T; Pecquet, A L; [1]  Truc, A; Hennequin, P; Gervais, F; Quemeneur, A [2] 
  1. Association Euratom-CEA, Centre d`Etudes de Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee
  2. Ecole Polytechnique, 91 - Palaiseau (France)
Publication Date:
Jun 01, 1992
Product Type:
Technical Report
Report Number:
EUR-CEA-FC-1454
Reference Number:
SCA: 700310; PA: AIX-24:009269; SN: 93000933663
Resource Relation:
Other Information: PBD: Jun 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TORE SUPRA TOKAMAK; CONFINEMENT TIME; DOPPLER EFFECT; ELECTRON DENSITY; ELECTRON TEMPERATURE; JOULE HEATING; TURBULENCE; 700310; PLASMA CONFINEMENT
OSTI ID:
10119834
Research Organizations:
Association Euratom-CEA, Centre d`Etudes de Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Other: ON: TI93613661; TRN: FR9300235009269
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
FRN
Size:
[25] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Garbet, X, Payan, J, Laviron, C, Devynck, P, Saha, S K, Capes, H, Chen, X P, Coulon, J P, Gil, C, Harris, G, Hutter, T, Pecquet, A L, Truc, A, Hennequin, P, Gervais, F, and Quemeneur, A. Turbulence and energy confinement in TORE SUPRA ohmic discharges. France: N. p., 1992. Web.
Garbet, X, Payan, J, Laviron, C, Devynck, P, Saha, S K, Capes, H, Chen, X P, Coulon, J P, Gil, C, Harris, G, Hutter, T, Pecquet, A L, Truc, A, Hennequin, P, Gervais, F, & Quemeneur, A. Turbulence and energy confinement in TORE SUPRA ohmic discharges. France.
Garbet, X, Payan, J, Laviron, C, Devynck, P, Saha, S K, Capes, H, Chen, X P, Coulon, J P, Gil, C, Harris, G, Hutter, T, Pecquet, A L, Truc, A, Hennequin, P, Gervais, F, and Quemeneur, A. 1992. "Turbulence and energy confinement in TORE SUPRA ohmic discharges." France.
@misc{etde_10119834,
title = {Turbulence and energy confinement in TORE SUPRA ohmic discharges}
author = {Garbet, X, Payan, J, Laviron, C, Devynck, P, Saha, S K, Capes, H, Chen, X P, Coulon, J P, Gil, C, Harris, G, Hutter, T, Pecquet, A L, Truc, A, Hennequin, P, Gervais, F, and Quemeneur, A}
abstractNote = {Results on confinement and turbulence from a set of ohmic discharges in Tore Supra are discussed. The attention is focused on the saturation of the energy confinement time and it is emphasized that this saturation could be explained by a saturation of the electron heat diffusivity. Ion behaviour is indeed governed by dilution and equipartition effects. Although the ion heat transport is never neoclassical, there is no enhanced degradation at the saturation. This behaviour is confirmed by turbulence measurements given by CO{sub 2} laser coherent scattering. The density fluctuations level follows the electron heat diffusivity variations with the average density. Waves propagating in the ion diamagnetic direction are always present in turbulence frequency spectra. Thus, the saturation cannot be explained by the onset of an ion turbulence. The existence of an ion turbulence at the edge at all densities cannot be excluded. However, this ion feature in scattering spectra could be explained by a Doppler shift associated to an inversion point of the radial electric field at the edge.}
place = {France}
year = {1992}
month = {Jun}
}