Sawtooth evolution during JET ion-cyclotron-resonance-heated pulses

The recent Joint European Torus deuterium-tritium campaign has yielded ion- cyclotron-resonance-heated (ICRH) pulses during which both the sawtooth cha racteristics and the ICRH minority ion population both evolve substantially . At multiple times during each pulse, the evolution of the kinetic-fluid M HD energy is calculated from measurement of the energetic ions and compared with the evolving sawtooth duration. There is strong correlation between s awtooth duration and minority ion stabilization of the ideal internal kink.