EPJ Web Conf.
Volume 157, 201722 Topical Conference on Radio-Frequency Power in Plasmas
|Number of page(s)||4|
|Published online||23 October 2017|
Sawtooth pacing with on-axis ICRH modulation in JET-ILW
EUROfusion Consortium, JET, Culham Science Centre, Abingdon, OX14 3DB, UK
1 CCFE, Culham Science Centre, Abingdon, United Kingdom
2 LPP-ERM/KMS, Association EUROFUSION-Belgian State, TEC partner, Brussels, Belgium
3 Instituto de Plasmas e Fusão Nuclear, EUROFUSION-IST, University of Lisbon, Portugal
4 CRPP-EPFL, Association EUROFUSION - Confédération Suisse, Lausanne, Switzerland
5 Consorzio RFX, Association EUROFUSION – CNR/ENEA, Padova, Italy
Published online: 23 October 2017
A novel technique for sawteeth control in tokamak plasmas using ion-cyclotron resonance heating (ICRH) has been developed in the JET-ILW tokamak . Unlike previous ICRH methods, which explored the destabilization of the internal kink mode when the radiofrequency (RF) wave absorption was placed near the q=1 surface, the technique presented here consists of stabilizing the sawteeth as fast as possible by applying the ICRH power centrally and inducing a sawtooth crash by switching it off at the appropriate instant. Since it employs on-axis ICRH, this technique is aligned with other ICRH applications that require central plasma heating such as high-Z impurity control and fusion power enhancement. The validation of this method in JET-ILW L-mode discharges is presented.
© The authors, published by EDP Sciences, 2017
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