Evolution of the radial electric field in a JET H-mode plasma

Y. Andrew; N. C. Hawkes; T. Biewer; K. Crombe; D. Keeling; E. de la Luna; C. Giroud; A. Korotkov; A. Meigs; A. Murari; I. Nunes; R. Sartori; T. Tala; The JET-EFDA contributors

doi:10.1209/0295-5075/83/15003

All issues

Volume 83 / No 1 (July 2008)

EPL, 83 1 (2008) 15003

Abstract

Issue		EPL Volume 83, Number 1, July 2008


Article Number		15003
Number of page(s)		6
Section		Physics of Gases, Plasmas and Electric Discharges
DOI		https://doi.org/10.1209/0295-5075/83/15003
Published online		16 June 2008

EPL, 83 (2008) 15003

Evolution of the radial electric field in a JET H-mode plasma

Y. Andrew¹^,2, N. C. Hawkes¹^,2, T. Biewer¹^,3, K. Crombe¹^,4, D. Keeling¹^,2, E. de la Luna¹^,5, C. Giroud¹^,2, A. Korotkov¹^,2, A. Meigs¹^,2, A. Murari¹^,6, I. Nunes¹^,7, R. Sartori¹^,8, T. Tala¹^,9 and The JET-EFDA contributors¹

¹ JET-EFDA, Culham Science Centre - Abingdon, OX14 3DB, UK, EU
² Euratom/UKAEA Fusion Association, Culham Science Centre - Abingdon, OX14 3DB, UK, EU
³ Oak Ridge National Laboratory - Oak Ridge, TN 37831, USA
⁴ Department of Applied Physics, Ghent University - Belgium, EU
⁵ Asociasion EURATOM-CIEMAT para Fusion, CIEMAT - Madrid, Spain, EU
⁶ Consorzio RFX, ENEA-Euratom Association - Padua, Italy, EU
⁷ Associação EURATOM/IST, Centrode Fusão Nuclear - Lisbon, Portugal, EU
⁸ EFDA CSU - Boltzmannstrasse 2, 85748 Garching, Germany, EU
⁹ Association EURATOM-Tekes, VTT - P.O. Box 1000, FIN-02044 VTT, Finland, EU

Received: 27 March 2008
Accepted: 20 May 2008

Abstract

Results from recent measurements of carbon impurity ion toroidal and poloidal rotation velocities, ion temperature, ion density and the resulting radial electric field (E_r) 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^-1. Such values of poloidal rotation provide an important contribution to the total edge plasma E_r profiles. Large values of shear in the measured E_r 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.

PACS: 52.30.-q – Plasma dynamics and flow

© EPLA, 2008

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