Experimental Study of the Ion Critical-Gradient Length and Stiffness Level and the Impact of Rotation in the JET Tokamak

P. Mantica, D. Strintzi, T. Tala, C. Giroud, T. Johnson, H. Leggate, E. Lerche, T. Loarer, A. G. Peeters, A. Salmi, S. Sharapov, D. Van Eester, P. C. de Vries, L. Zabeo, and K.-D. Zastrow
Phys. Rev. Lett. 102, 175002 – Published 29 April 2009

Abstract

Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R/LTi=R|Ti|/Ti) for the onset of ion temperature gradient modes and the stiffness of Ti profiles with respect to deviations from the critical value. Threshold and stiffness have been compared with linear and nonlinear predictions of the gyrokinetic code GS2. Plasmas with higher values of toroidal rotation show a significant increase in R/LTi, which is found to be mainly due to a decrease of the stiffness level. This finding has implications on the extrapolation to future machines of present day results on the role of rotation on confinement.

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  • Received 12 October 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.175002

©2009 American Physical Society

Authors & Affiliations

P. Mantica1, D. Strintzi2, T. Tala3, C. Giroud4, T. Johnson5, H. Leggate4, E. Lerche6, T. Loarer7, A. G. Peeters8, A. Salmi9, S. Sharapov4, D. Van Eester6, P. C. de Vries4, L. Zabeo4, and K.-D. Zastrow4

  • 1Istituto di Fisica del Plasma “P. Caldirola,”Associazione Euratom-ENEA-CNR, Milano, Italy
  • 2National Technical University of Athens, Association Euratom Hellenic Republic, GR-15773 Athens, Greece
  • 3Association EURATOM-Tekes, VTT, P.O. Box 1000, FIN-02044 VTT, Finland
  • 4Culham Science Centre, EURATOM/UKAEA Association, OX14 3DB, Abingdon, United Kingdom
  • 5Association EURATOM-VR, Fusion Plasma Physics, EES, KTH, Stockholm, Sweden
  • 6LPP-ERM/KMS, Association Euratom-Belgian State, TEC, B-1000 Brussels, Belgium
  • 7CEA Cadarache, Association EURATOM-CEA, 13108, St Paul-Lez-Durance, France
  • 8Centre for Fusion Space and Astrophysics, University of Warwick, Coventry 7AL, United Kingdom
  • 9Association EURATOM-Tekes, Helsinki University of Technology, P.O. Box 2200, FIN-02150 TKK, Finland

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Vol. 102, Iss. 17 — 1 May 2009

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