Poloidal rotation dynamics, radial electric field, and neoclassical theory in the jet internal-transport-barrier region

Poloidal rotation dynamics, radial electric field, and neoclassical theory in the jet internal-transport-barrier region

Results from the first measurements of a core plasma poloidal rotation velocity (upsilontheta) across internal transport barriers (ITB) on JET are presented. The spatial and temporal evolution of the ITB can be followed along with the upsilontheta radial profiles, providing a very clear link between...

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Bibliographic Details
Published in:Physical review letters Vol. 95; no. 15; pp. 155003.1 - 155003.4
Main Authors: CROMBE, K, ANDREW, Y, VAN OUST, G, VOITSEKHOVITCH, I, ZASTROW, K.-D, BRIX, M, GIROUD, C, HACQUIN, S, HAWKES, N. C, MURARI, A, NAVE, M. F. F, ONGENA, J, PARAIL, V
Format: Journal Article
Language:English
Published: Ridge, NY American Physical Society 07-10-2005
Subjects:
CHARGED-PARTICLE TRANSPORT
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRIC DISCHARGES
ELECTRIC FIELDS
Exact sciences and technology
HEAT TRANSFER
ION TEMPERATURE
Magnetic confinement and equilibrium
NEOCLASSICAL TRANSPORT THEORY
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
Plasma properties
ROTATION
SPIN
TEMPERATURE GRADIENTS
THERMAL BARRIERS
TOKAMAK DEVICES
Tokamaks
Transport properties
JET tokamak
Plasma transport processes
Internal transport barrier
Neoclassical transport theory
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Summary:Results from the first measurements of a core plasma poloidal rotation velocity (upsilontheta) across internal transport barriers (ITB) on JET are presented. The spatial and temporal evolution of the ITB can be followed along with the upsilontheta radial profiles, providing a very clear link between the location of the steepest region of the ion temperature gradient and localized spin-up of upsilontheta. The upsilontheta measurements are an order of magnitude higher than the neoclassical predictions for thermal particles in the ITB region, contrary to the close agreement found between the determined and predicted particle and heat transport coefficients [K.-D. Zastrow, Plasma Phys. Controlled Fusion 46, B255 (2004)]. These results have significant implications for the understanding of transport barrier dynamics due to their large impact on the measured radial electric field profile.
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ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.95.155003