ELM mitigation via rotating resonant magnetic perturbations on MAST
Abstract
The application of resonant magnetic perturbations (RMPs) produces splitting of the divertor strike point due to the interaction of the RMP field and the plasma field. The application of a rotating RMP field causes the strike point splitting to rotate, distributing the particle and heat flux evenly over the divertor. The RMP coils in MAST have been used to generate a rotating perturbation with a toroidal mode number n=3. The ELM frequency is doubled with the application of the RMP rotating field, whilst maintaining the H mode. During mitigation, the ELM peak heat flux is seen to be reduced by 50% for a halving in the ELM energy and motion of the strike point, consistent with the rotation of the applied RMP field, is seen using high spatial resolution (1.5mm at the target) heat flux profiles measured using infrared (IR) thermography.
Keywords
Cite
@article{arxiv.1410.2473,
title = {ELM mitigation via rotating resonant magnetic perturbations on MAST},
author = {A. J. Thornton and A. Kirk and P. Cahyna and I. T. Chapman and G. Fishpool and J. R. Harrison and Y. Q. Liu and L. Kripner and M. Peterka and the MAST Team},
journal= {arXiv preprint arXiv:1410.2473},
year = {2015}
}
Comments
18 pages, 6 figures