Brunetti, D., Graves, J. P. orcid.org/0000-0002-7959-7959, Ham, C. J. et al. (1 more author) (2025) An explanation for hard MHD stability limits in low-q95 diverted tokamak plasmas. Plasma Physics and Controlled Fusion. 082502. ISSN: 1361-6587
Abstract
This paper proposes a model attempting to explain the appearance of fast growing global disruptive instabilities in diverted configurations when the safety factor near the magnetic separatrix approaches two. We show that if edge density and pressure gradients are strong enough, although external kink modes are stable, poloidal harmonics may couple allowing for a global fluid perturbation to become unstable. The instability window is approached sharply as the mode resonance occurs in the edge region, and is characterised by rather large growth rates even with modest gradients.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2025 The Author(s). Published by IOP Publishing Ltd |
Keywords: | MHD,q,stability,tokamak |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Date Deposited: | 30 Sep 2025 09:20 |
Last Modified: | 30 Sep 2025 09:20 |
Published Version: | https://doi.org/10.1088/1361-6587/adf997 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1361-6587/adf997 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:232370 |
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