Poloidal Rotation Dynamics, Radial Electric Field, and Neoclassical Theory in the Jet Internal-Transport-Barrier Region
- Department of Applied Physics, Ghent University (Belgium)
- Euratom/UKAEA, Fusion Association, Culham Science Center, Oxon (United Kingdom)
- Association EURATOM-FZ-Juelich, Institut fuer Plasmaphysik, Juelich (Germany)
- Associacao EURATOM/IST, Centro de Fusao Nuclear, Lisbon (Portugal)
- Consorzio RFX, ENEA-Euratom Association, Padua (Italy)
- LPP/ERM-KMS, Association EURATOM-Belgian State, B-1000 Brussels (Belgium)
Results from the first measurements of a core plasma poloidal rotation velocity (v{sub {theta}}) across internal transport barriers (ITB) on JET are presented. The spatial and temporal evolution of the ITB can be followed along with the v{sub {theta}} radial profiles, providing a very clear link between the location of the steepest region of the ion temperature gradient and localized spin-up of v{sub {theta}}. The v{sub {theta}} 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 et al., 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.
- OSTI ID:
- 20696547
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.95.155003; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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