Equilibrium β-limits dependence on bootstrap current in classical stellarators
While it is important to design stellarators with high magnetohydrodynamic stability -limit, it is also crucial to ensure that good magnetic surfaces exist in a large range of values. As increases, pressure-driven currents perturb the vacuum magnetic field and often lead to the emergence of magnetic...
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sg-ntu-dr.10356-1740932024-03-18T15:36:08Z Equilibrium β-limits dependence on bootstrap current in classical stellarators Baillod, A. Loizu, J. Qu, Zhisong Arbez, H. P. Graves, J. P. School of Physical and Mathematical Sciences Physics Plasma confinement Plasma nonlinear phenomena While it is important to design stellarators with high magnetohydrodynamic stability -limit, it is also crucial to ensure that good magnetic surfaces exist in a large range of values. As increases, pressure-driven currents perturb the vacuum magnetic field and often lead to the emergence of magnetic field line chaos, which can worsen the confinement and is the cause of another kind of -limit, the so-called equilibrium -limit. In this paper, we explore numerically the dependence of the equilibrium -limit on the bootstrap current strength in a classical stellarator geometry using the stepped pressure equilibrium code. We develop a diagnostic to determine whether or not magnetic islands are expected to participate significantly to radial transport, and we build an analytical model to predict the expected equilibrium -limit, which recovers the main features of the numerical results. This research opens the possibility to include additional targets in stellarator optimization functions, provides additional understanding on the existence of magnetic surfaces at large, and is a step forward in the understanding of the equilibrium -limit. Published version This work has been carried out within the framework of the EUROfusion Consortium, via the Euratom Research and Training Programme (grant agreement no. 101052200EUROfusion) and funded by the Swiss State Secretariat for Education, Research and Innovation (SERI). Views and opinions expressed are, however, those of the author(s) only and do not necessarily reflect those of the European Union, the European Commission or SERI. Neither the European Union nor the European Commission nor SERI can be held responsible for them. This research was supported by a grant from the Simons Foundation (1013657, J.L.). 2024-03-15T05:58:20Z 2024-03-15T05:58:20Z 2023 Journal Article Baillod, A., Loizu, J., Qu, Z., Arbez, H. P. & Graves, J. P. (2023). Equilibrium β-limits dependence on bootstrap current in classical stellarators. Journal of Plasma Physics, 89(5), 905890508-. https://dx.doi.org/10.1017/S0022377823000910 0022-3778 https://hdl.handle.net/10356/174093 10.1017/S0022377823000910 2-s2.0-85172920372 5 89 905890508 en Journal of Plasma Physics © The Author(s), 2023. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited. application/pdf |
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Physics Plasma confinement Plasma nonlinear phenomena Baillod, A. Loizu, J. Qu, Zhisong Arbez, H. P. Graves, J. P. Equilibrium β-limits dependence on bootstrap current in classical stellarators |
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While it is important to design stellarators with high magnetohydrodynamic stability -limit, it is also crucial to ensure that good magnetic surfaces exist in a large range of values. As increases, pressure-driven currents perturb the vacuum magnetic field and often lead to the emergence of magnetic field line chaos, which can worsen the confinement and is the cause of another kind of -limit, the so-called equilibrium -limit. In this paper, we explore numerically the dependence of the equilibrium -limit on the bootstrap current strength in a classical stellarator geometry using the stepped pressure equilibrium code. We develop a diagnostic to determine whether or not magnetic islands are expected to participate significantly to radial transport, and we build an analytical model to predict the expected equilibrium -limit, which recovers the main features of the numerical results. This research opens the possibility to include additional targets in stellarator optimization functions, provides additional understanding on the existence of magnetic surfaces at large, and is a step forward in the understanding of the equilibrium -limit. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Baillod, A. Loizu, J. Qu, Zhisong Arbez, H. P. Graves, J. P. |
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Article |
author |
Baillod, A. Loizu, J. Qu, Zhisong Arbez, H. P. Graves, J. P. |
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Baillod, A. |
title |
Equilibrium β-limits dependence on bootstrap current in classical stellarators |
title_short |
Equilibrium β-limits dependence on bootstrap current in classical stellarators |
title_full |
Equilibrium β-limits dependence on bootstrap current in classical stellarators |
title_fullStr |
Equilibrium β-limits dependence on bootstrap current in classical stellarators |
title_full_unstemmed |
Equilibrium β-limits dependence on bootstrap current in classical stellarators |
title_sort |
equilibrium β-limits dependence on bootstrap current in classical stellarators |
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2024 |
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https://hdl.handle.net/10356/174093 |
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1794549490621874176 |