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

doi:10.1051/epjconf/201715703029

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

Laboratory for Plasma Physics

Publikation: Beitrag in Fachzeitschrift › Konferenzartikel › Begutachtung

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.

Originalsprache	Englisch
Aufsatznummer	03029
Fachzeitschrift	EPJ Web of Conferences
Jahrgang	157
DOIs	https://doi.org/10.1051/epjconf/201715703029
Publikationsstatus	Veröffentlicht - 23 Okt. 2017
Veranstaltung	22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 - Aix en Provence, Frankreich Dauer: 30 Mai 2017 → 2 Juni 2017

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title = "Sawtooth pacing with on-axis ICRH modulation in JET-ILW",

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.",

author = "E. Lerche and M. Lennholm and Carvalho, {I. S.} and P. Dumortier and F. Durodie and {Van Eester}, D. and J. Graves and Ph Jacquet and A. Murari",

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AU - Lerche, E.

AU - Lennholm, M.

AU - Carvalho, I. S.

AU - Dumortier, P.

AU - Durodie, F.

AU - Van Eester, D.

AU - Graves, J.

AU - Jacquet, Ph

AU - Murari, A.

PY - 2017/10/23

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N2 - 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.

AB - 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.

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

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