Pellet fuelling with edge-localised modes controlled by external magnetic perturbations in MAST
M Valovic, L Garzotti, C Gurl, A Kirk, D Dunai, A R Field, I Lupelli,, G Naylor, A Thornton
TL;DR
This paper demonstrates that external magnetic perturbations can control edge-localised modes (ELMs) in MAST, improving pellet fuelling efficiency by managing particle loss and ELM size.
Contribution
It introduces a method to control ELMs using magnetic perturbations during pellet fuelling, enhancing plasma control in tokamaks.
Findings
Post-pellet ELM size can be controlled externally.
ELMs dominate post-pellet particle loss.
Magnetic perturbations influence particle removal zones.
Abstract
The fuelling of plasmas by shallow frozen pellets with simultaneous mitigation of edge localised modes (ELM) by external magnetic perturbation is demonstrated on the MAST tokamak. Post-pellet particle loss is dominated by ELMs and inter-ELM gas fuelling. It is shown that the size of post-pellet ELMs can be controlled by external magnetic perturbations. Post-pellet ELMs remove particles from the large part of pellet deposition zone including the area with positive density gradient. The mechanism explaining this peculiarity of particle loss is suggested.
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