Nonlinear magnetohydrodynamic modeling of current-drive-induced sawtooth-like crashes in the W7-X stellarator
Abstract
Sawtooth-like core electron temperature crashes have been observed in W7-X experiments with electron cyclotron current drive. Here we present nonlinear single-fluid magnetohydrodynamic simulations of this phenomenon using the newly developed stellarator modeling capability of the M3D-C1 code. The near-axis current drive gives rise to two ι = 1 resonances in the equilibrium rotational transform profile so that two consecutive (1, 1) internal kink modes are seen in the simulations. A small-amplitude crash at the inner resonance occurs first, which may correspond to the sawtooth precursors observed in the experiments. A bigger crash at the outer resonance then flattens the core temperature profile, which shows semi-quantitative agreements with experimental measurements on certain metrics such as the crash amplitude and the inversion radius of the temperature change. These results illustrate a likely mechanism of the current-drive-induced sawtooth-like crashes in W7-X and, to some extent, validate the stellarator modeling capability of M3D-C1.
- Authors:
-
[1];
[2];
[3]
- Shanghai Jiao Tong Univ. (China)
- Max Planck Institute for Plasma Physics, Greifswald (Germany); Max-Planck-Princeton Research Center for Plasma Physics, Princeton, NJ (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE; Shanghai Pujiang Program
- OSTI Identifier:
- 1970766
- Alternate Identifier(s):
- OSTI ID: 1961501
- Grant/Contract Number:
- AC02-09CH11466; 21PJ1408600
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 3; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetohydrodynamics; plasma instabilities; stellarators
Citation Formats
Zhou, Yao, Aleynikova, Ksenia, and Ferraro, Nathaniel M. Nonlinear magnetohydrodynamic modeling of current-drive-induced sawtooth-like crashes in the W7-X stellarator. United States: N. p., 2023.
Web. doi:10.1063/5.0136654.
Zhou, Yao, Aleynikova, Ksenia, & Ferraro, Nathaniel M. Nonlinear magnetohydrodynamic modeling of current-drive-induced sawtooth-like crashes in the W7-X stellarator. United States. https://doi.org/10.1063/5.0136654
Zhou, Yao, Aleynikova, Ksenia, and Ferraro, Nathaniel M. Tue .
"Nonlinear magnetohydrodynamic modeling of current-drive-induced sawtooth-like crashes in the W7-X stellarator". United States. https://doi.org/10.1063/5.0136654. https://www.osti.gov/servlets/purl/1970766.
@article{osti_1970766,
title = {Nonlinear magnetohydrodynamic modeling of current-drive-induced sawtooth-like crashes in the W7-X stellarator},
author = {Zhou, Yao and Aleynikova, Ksenia and Ferraro, Nathaniel M.},
abstractNote = {Sawtooth-like core electron temperature crashes have been observed in W7-X experiments with electron cyclotron current drive. Here we present nonlinear single-fluid magnetohydrodynamic simulations of this phenomenon using the newly developed stellarator modeling capability of the M3D-C1 code. The near-axis current drive gives rise to two ι = 1 resonances in the equilibrium rotational transform profile so that two consecutive (1, 1) internal kink modes are seen in the simulations. A small-amplitude crash at the inner resonance occurs first, which may correspond to the sawtooth precursors observed in the experiments. A bigger crash at the outer resonance then flattens the core temperature profile, which shows semi-quantitative agreements with experimental measurements on certain metrics such as the crash amplitude and the inversion radius of the temperature change. These results illustrate a likely mechanism of the current-drive-induced sawtooth-like crashes in W7-X and, to some extent, validate the stellarator modeling capability of M3D-C1.},
doi = {10.1063/5.0136654},
journal = {Physics of Plasmas},
number = 3,
volume = 30,
place = {United States},
year = {Tue Mar 14 00:00:00 EDT 2023},
month = {Tue Mar 14 00:00:00 EDT 2023}
}
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