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Titolo:
Characterization of impurities in L- and H-modes created by divertor biasing and plasma triangularity in TdeV
Autore:
Condrea, I; Haddad, E; Cote, C; Gregory, BC;
Indirizzi:
Ctr Canadien Fus Magnet, Varennes, PQ J3X 1S1, Canada Ctr Canadien Fus Magnet Varennes PQ Canada J3X 1S1 es, PQ J3X 1S1, Canada Ecole Polytech Fed Lausanne, Assoc Euratom Confederat Suisse, Ctr Rech Phys Plasmas, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne Lausanne Switzerland CH-1015 ne, Switzerland MPB Technol Inc, Dorval, PQ H9P 1J1, Canada MPB Technol Inc Dorval PQ Canada H9P 1J1 Inc, Dorval, PQ H9P 1J1, Canada INRS Energie & Mat, Varennes, PQ J3X 1S2, Canada INRS Energie & Mat Varennes PQ Canada J3X 1S2 arennes, PQ J3X 1S2, Canada
Titolo Testata:
PLASMA PHYSICS AND CONTROLLED FUSION
fascicolo: 2, volume: 43, anno: 2001,
pagine: 71 - 98
SICI:
0741-3335(200102)43:2<71:COIILA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
EDGE ELECTRIC-FIELD; POLOIDAL ROTATION; ION TEMPERATURE; TOKAMAK PLASMA; JFT-2M TOKAMAK; CONFINEMENT; TRANSPORT; ASYMMETRIES; JET; SHEAR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Condrea, I Ctr Canadien Fus Magnet, Varennes, PQ J3X 1S1, Canada Ctr Canadien Fus Magnet Varennes PQ Canada J3X 1S1 1S1, Canada
Citazione:
I. Condrea et al., "Characterization of impurities in L- and H-modes created by divertor biasing and plasma triangularity in TdeV", PLASMA PHYS, 43(2), 2001, pp. 71-98

Abstract

A characterization of the H-mode in Tokamak de Varennes (TdeV) is presented, combining results obtained from spectroscopic measurements with observations of global plasma parameters. Controlled L- and H-modes are obtained byapplying an external bias on the divertor plate and/or by varying the plasma triangularity using similar steady-state discharges with electron cyclotron resonance heating (ECRH). A qualitative study of the impurity emission asymmetries is presented and discussed by proposing a simple model which considers that the emissivity has radial and poloidal components. The poloidal velocities are small with no significant variations with respect to the plate biasing, EC power and plasma triangularity. Toroidal. rotation velocities show more consistent trends and have larger values in the H-modes with respect to the L-modes. No significant shear in the radial electric field is observed between the H- and L-modes. Differences in the electric field and in the E x B shear are observed for several discharges, but they are not consistent overall. A study on the impurity transport shows low diffusivityvalues in the plasma centre and high values in the edge during the H-mode. The energy confinement time decreases with the severity of the edge localized modes and, consequently, with the neutral fluxes. The presence of a toroidal torque which affects the particle transport inside the plasma plays an important role in the TdeV H-modes.

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Documento generato il 19/01/20 alle ore 14:34:33