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Abstract

Understanding the physics of internal transport barriers (ITBs) is a crucial issue in developing ITER relevant advanced tokamak scenarios. To gain new information on ITBs, RF power modulation experiments, mainly devoted to the study of electron heat transport through ITBs, have been performed on the JET tokamak. The main physics results have been reported in [1]. The present paper describes in detail the data analysis and numerical modelling work carried out for the interpretation of the experiments. ITBs located in the negative shear region behave as localized insulating layers able to stop the heat wave propagation, thus implying that the ITB is a region of low diffusivity characterized by a loss of stiffness. Various sources of spurious effects affecting the interpretation of the results are analysed and discussed. First principle based models have so far failed to predict the temperature profile in the first place, which prevented their application to modulation results, while empirical transport models have been set up and reproduce the major part of the data.

Additional information

Authors: MANTSINEN M, Association EURATOM-TEKES, Helsinki University of Technology (FI);SALMI A, Association EURATOM-TEKES, Helsinki University of Technology (FI);HAWKES N, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);KIPTILY V, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);SHARAPOV S, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);VOITSEKHOVITCH I, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ZASTROW K D, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PINCHES S D, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);DE VRIES P, FOM Instituut voor Plasmafyisica Rijnhuizen, Euratom-FOM Association, Trilateral Euregio Cluster, Nieuwegein (NL);MARINONI A, Politecnico di Milano, dipartimento di Ingegneria Nucleare, Milano (IT);MANTICA P, Istituto di Fisica del Plasma, EURATOM�ENEA�CNR Association Milano (IT);VAN EESTER D, LPP-ERM/KMS, Association EURATOM-Belgian State, Brussels (BE);IMBEAUX F, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);JOFFRIN E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 48 (2006), pp. 1469-1487
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0741-3335/48/10/002
Record Number: 200719124 / Last updated on: 2007-04-11
Category: PUBLICATION
Original language: en
Available languages: en