Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session PP11: Poster Session VI: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Diagnostics; Edge and Pedestal; Stability; Heating; Transport, Turbulence
ASTRO: Astrophysical Plasma
2:00 PM - 5:00 PM
Wednesday, October 19, 2022
Room: Exhibit Hall A and Online
Abstract: PP11.00036 : Effect of plasma shaping on MAST and MAST-U pedestal stability*
Presenter:
Koki Imada
(University of York)
Authors:
Koki Imada
(University of York)
Xi Chen
(General Atomics)
Andrew Kirk
(Culham Centre for Fusion Energy)
Matthias Knolker
(General Atomics)
Thomas H Osborne
(General Atomics)
Samuli Saarelma
(Culham Centre for Fusion Energy)
Philip B Snyder
(Oak Ridge National Lab)
Howard R Wilson
(University of York)
Collaboration:
The MAST-Upgrade Team
According to the "peeling-ballooning" theory, the pedestal stability is bounded by high-n ballooning modes at high pedestal pressure gradient (α), and by peeling modes at high pedestal plasma current density (Jped) (n = toroidal mode number). This boundary depends on the plasma cross-sectional shape, defined by elongation, triangularity and squareness. Experiments and theoretical studies show that strong shaping can push the stability boundary to higher Jped and α, improving performance and potentially influencing ELM dynamics.
In the first campaign of the new MAST-Upgrade tokamak, some H-mode shots were peeling-limited; a stark contrast to the old MAST, which was always ballooning-limited. This could be a result of different shaping parameters between them, particularly the squareness. This paper reports on the comparison between several MAST and MAST-U shots of pedestal analysis using ELITE code. If shaping plays a significant role, then it could open a new pathway for improving H-mode performance, with applications to future machines like ITER.
*This research is funded by US Department of Energy through General Atomics, grant number DE-SC0018990.
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