TY - JOUR
T1 - Sawtooth pacing with on-axis ICRH modulation in JET-ILW
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.
N1 - Publisher Copyright:
© 2017 The authors, published by EDP Sciences.
PY - 2017/10/23
Y1 - 2017/10/23
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.
UR - http://www.scopus.com/inward/record.url?scp=85032632179&partnerID=8YFLogxK
U2 - 10.1051/epjconf/201715703029
DO - 10.1051/epjconf/201715703029
M3 - Conference article
AN - SCOPUS:85032632179
SN - 2101-6275
VL - 157
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 03029
T2 - 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017
Y2 - 30 May 2017 through 2 June 2017
ER -