Publication

Individual Sawtooth pacing by synchronized ECCD in TCV

Olivier Sauter, Basil Duval, Timothy Goodman, Holger Reimerdes
2011
Conference Papers

Abstract

Previous real-time sawtooth control scenarios using EC actuators have attempted to shorten [1] or lengthen [2] the sawtooth period by optimally positioning the EC absorption near the q=1 surface. In new experiments we demonstrate for the first time that individual sawtooth crashes can be repetitively induced at predictable times by reducing the stabilizing ECCD power after a predetermined time from the preceding crash. Other stabilizing actuators ( e. g. ICRF, NBI) are expected to produce similar effects. Armed with these results, we present a new sawtooth / NTM control paradigm for improved performance in burning plasmas. The potential appearance of neo-classical tearing modes, triggered by long period sawtooth crashes even at low beta, becomes predictable and therefore amenable to preemptive ECCD. The ITER Electron Cyclotron Upper Launcher (EC-UL) design incorporates the needed functionalities for this method to be applied. The methodology and associated TCV experiments will be presented.

Official source

https://infoscience.epfl.ch/entities/publication/3bc17950-01ec-4dae-9d1a-49aeff28cccd

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Olivier Sauter, Basil Duval, Timothy Goodman, Holger Reimerdes
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/3bc17950-01ec-4dae-9d1a-49aeff28cccd

About this result

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Individual Sawtooth pacing by synchronized ECCD in TCV

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