Evolution of the radial electric field in a JET H-mode plasma
Andrew, Y.; Hawkes, N. C.; Biewer, T.; Crombe, K.; Keeling, D.; de la Luna, E.; Giroud, C.; Korotkov, A.; Meigs, A.; Murari, A.; Nunes, I.; Sartori, R.; Tala, T.; Andrew, Y.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Euratom/UKAEA Fusion Association, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Hawkes, N. C.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Euratom/UKAEA Fusion Association, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Biewer, T.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Oak Ridge National Laboratory - Oak Ridge, TN 37831, USA; Crombe, K.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Department of Applied Physics, Ghent University - Belgium, EU; Keeling, D.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Euratom/UKAEA Fusion Association, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; de la Luna, E.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Asociasion EURATOM-CIEMAT para Fusion, CIEMAT - Madrid, Spain, EU; Giroud, C.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Euratom/UKAEA Fusion Association, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Korotkov, A.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Euratom/UKAEA Fusion Association, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Meigs, A.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Euratom/UKAEA Fusion Association, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Murari, A.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Consorzio RFX, ENEA-Euratom Association - Padua, Italy, EU; Nunes, I.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Associação EURATOM/IST, Centrode Fusão Nuclear - Lisbon, Portugal, EU; Sartori, R.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; EFDA CSU - Boltzmannstrasse 2, 85748 Garching, Germany, EU; Tala, T.; JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU; Association EURATOM-Tekes, VTT - P.O. Box 1000, FIN-02044 VTT, Finland, EU; , ;
Журнал:
EPL (Europhysics Letters)
Дата:
2008-07-01
Аннотация:
Results from recent measurements of carbon impurity ion toroidal and poloidal rotation velocities, ion temperature, ion density and the resulting radial electric field (E<sub>r</sub>) profiles are presented from an evolving Joint European Torus (JET) tokamak plasma over a range of energy and particle confinement regimes. Significant levels of edge plasma poloidal rotation velocity have been measured for the first time on JET, with maximum values of ±9 km s<sup>- 1</sup>. Such values of poloidal rotation provide an important contribution to the total edge plasma E<sub>r</sub> profiles. Large values of shear in the measured E<sub>r</sub> profiles are observed to arise as a consequence of the presence of the edge transport barrier (ETB) and do not appear to be necessary for their formation or destruction. These results have an important impact on potential mechanisms for transport barrier triggering and sustainment in present-day and future high-performance fusion plasmas.
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