Sawtooth pacing with on-axis ICRH modulation in JET-ILW

E. Lerche, M. Lennholm, I.S. Carvalho, P. Dumortier, F. Durodie, D. Van Eester, J. Graves, Ph. Jacquet, A. Murari

Research output: Contribution to conferencePaper

Abstract

A novel technique for sawteeth control in tokamak plasmas using ion-cyclotron resonance heating (ICRH) has been developed in the JET-ILW tokamak [2]. 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.
Original languageEnglish
DOIs
Publication statusPublished - 23 Oct 2017
Externally publishedYes
Event22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 - Aix en Provence, France
Duration: 23 Oct 2017 → …

Conference

Conference22nd Topical Conference on Radio-Frequency Power in Plasmas 2017
CountryFrance
CityAix en Provence
Period23/10/17 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Lerche, E., Lennholm, M., Carvalho, I. S., Dumortier, P., Durodie, F., Van Eester, D., ... Murari, A. (2017). Sawtooth pacing with on-axis ICRH modulation in JET-ILW. Paper presented at 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017, Aix en Provence, France. https://doi.org/10.1051/epjconf/201715703029