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.
Highlights
In tokamak plasmas with a central safety factor lower than unity (q0
The current paper describes the first demonstration of sawtooth control through modulation of the ion-cyclotron resonance heating (ICRH) power
The concept is similar to the Electron Cyclotron Resonance Heating and Current Drive (ECRH) pacing and locking experiments [10,11], the difference being that the main effect of the ICRH modulation is to change the fast ion population properties in the plasma centre rather than perturb the q-profile near the q=1 surface
Summary
In tokamak plasmas with a central safety factor lower than unity (q0
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