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Turbulence in tokamak plasmas. Effect of a radial electric field shear; Turbulence dans les plasmas de tokamaks. Effet d`un cisaillement de champ electrique radial

Abstract

After a review of turbulence and transport phenomena in tokamak plasmas and the radial electric field shear effect in various tokamaks, experimental measurements obtained at Tore Supra by the means of the ALTAIR plasma diagnostic technique, are presented. Electronic drift waves destabilization mechanisms, which are the main features that could describe the experimentally observed microturbulence, are then examined. The effect of a radial electric field shear on electronic drift waves is then introduced, and results with ohmic heating are studied together with relations between turbulence and transport. The possible existence of ionic waves is rejected, and a spectral frequency modelization is presented, based on the existence of an electric field sheared radial profile. The position of the inversion point of this field is calculated for different values of the mean density and the plasma current, and the modelization is applied to the TEXT tokamak. The radial electric field at Tore Supra is then estimated. The effect of the ergodic divertor on turbulence and abnormal transport is then described and the density fluctuation radial profile in presence of the ergodic divertor is modelled. 80 figs., 120 refs.
Authors:
Publication Date:
May 01, 1994
Product Type:
Thesis/Dissertation
Report Number:
FRCEA-TH-491
Reference Number:
SCA: 700330; 700340; PA: AIX-26:053957; EDB-95:094259; ERA-20:020383; NTS-96:003242; SN: 95001414701
Resource Relation:
Other Information: TH: These (D. es Sc.).; PBD: May 1994
Subject:
70 PLASMA PHYSICS AND FUSION; PLASMA INSTABILITY; SHEAR; TORE SUPRA TOKAMAK; TURBULENCE; CHARGED-PARTICLE TRANSPORT; DIVERTORS; DRIFT INSTABILITY; EDGE LOCALIZED MODES; ELECTRIC FIELDS; ERGODIC HYPOTHESIS; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA DRIFT; SPATIAL DISTRIBUTION
OSTI ID:
66365
Research Organizations:
Association Euratom-CEA, Centre d`Etudes de Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee; Aix-Marseille-1 Univ., 13 - Marseille (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE95631961; TRN: FR9501621053957
Availability:
INIS; OSTI as DE95631961
Submitting Site:
FRN
Size:
171 p.
Announcement Date:

Citation Formats

Payan, J. Turbulence in tokamak plasmas. Effect of a radial electric field shear; Turbulence dans les plasmas de tokamaks. Effet d`un cisaillement de champ electrique radial. France: N. p., 1994. Web.
Payan, J. Turbulence in tokamak plasmas. Effect of a radial electric field shear; Turbulence dans les plasmas de tokamaks. Effet d`un cisaillement de champ electrique radial. France.
Payan, J. 1994. "Turbulence in tokamak plasmas. Effect of a radial electric field shear; Turbulence dans les plasmas de tokamaks. Effet d`un cisaillement de champ electrique radial." France.
@misc{etde_66365,
title = {Turbulence in tokamak plasmas. Effect of a radial electric field shear; Turbulence dans les plasmas de tokamaks. Effet d`un cisaillement de champ electrique radial}
author = {Payan, J}
abstractNote = {After a review of turbulence and transport phenomena in tokamak plasmas and the radial electric field shear effect in various tokamaks, experimental measurements obtained at Tore Supra by the means of the ALTAIR plasma diagnostic technique, are presented. Electronic drift waves destabilization mechanisms, which are the main features that could describe the experimentally observed microturbulence, are then examined. The effect of a radial electric field shear on electronic drift waves is then introduced, and results with ohmic heating are studied together with relations between turbulence and transport. The possible existence of ionic waves is rejected, and a spectral frequency modelization is presented, based on the existence of an electric field sheared radial profile. The position of the inversion point of this field is calculated for different values of the mean density and the plasma current, and the modelization is applied to the TEXT tokamak. The radial electric field at Tore Supra is then estimated. The effect of the ergodic divertor on turbulence and abnormal transport is then described and the density fluctuation radial profile in presence of the ergodic divertor is modelled. 80 figs., 120 refs.}
place = {France}
year = {1994}
month = {May}
}