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Abstract

The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to delta = 1% led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.

Additional information

Authors: DE VRIES P C, JET-EFDA Culham Science Centre, Abingdon (GB);HAWKES N C, JET-EFDA Culham Science Centre, Abingdon (GB);CHALLIS C D, JET-EFDA Culham Science Centre, Abingdon (GB);ANDREW Y, JET-EFDA Culham Science Centre, Abingdon (GB);BEURSKENS M, JET-EFDA Culham Science Centre, Abingdon (GB);BRIX M, JET-EFDA Culham Science Centre, Abingdon (GB);GIROUD C, JET-EFDA Culham Science Centre, Abingdon (GB);ZASTROW K-D, JET-EFDA Culham Science Centre, Abingdon (GB);JOFFRIN E, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);LITAUDON X, EFDA-JET CSU, Culham Science Centre, Abingdon (GB);BRZOZOWSKI J, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);JOHNSON T, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);CROMBÉ K, Association EURATOM-VR, Fusion Plasma Physics, EES, KTH, Stockholm (SE);HOBIRK J, Department of Applied Physics, Ghent University, Ghent (BE);LÖNNROTH J, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);SALMI A, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);TALA T, Association EURATOM-TEKES, Helsinki University of Technology (FI);YAVORSKIJ V, Association Euratom-Tekes, VTT (FI)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 50 (2008), 12 pp
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1088/0741-3335/50/6/065008
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