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

Funded under: FP7-EURATOM

Abstract

Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R/L(Ti)=R|Ti|/Ti) for the onset of ion temperature gradient modes and the stiffness of T(i) 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/L(Ti), 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.

Additional information

Authors: MANTICA P, Istituto di Fisica del Plasma "P. Caldirola,"Associazione Euratom-ENEA-CNR, Milano (IT);STRINTZI D, National Technical University of Athens, Association Euratom Hellenic Republic, Athens (EL);TALA T, Association EURATOM-Tekes, VTT (FI);GIROUD C, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);LEGGATE H, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);SHARAPOV S, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);DE VRIES P C, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ZABEO L, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ZASTROW K-D, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);JOHNSON T, Association EURATOM-VR, Fusion Plasma Physics, Stockholm (SE);LERCHE E, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);VAN EESTER D, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);LOARER T, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);PEETERS A G, Centre for Fusion Space and Astrophysics, University of Warwick, Coventry (GB);SALMI A, Association EURATOM-Tekes, Helsinki University of Technology, TKK (FI)
Bibliographic Reference: An article published in: Physical Review Letters, Volume 102 (2009), 5 pp.
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1103/PhysRevLett.102.175002
Record Number: 200910386 / Last updated on: 2009-09-22
Category: PUBLICATION
Original language: en
Available languages: en