تقرير
Nonlinear magnetohydrodynamic modeling of current-drive-induced sawtooth-like crashes in the W7-X stellarator
| العنوان: | Nonlinear magnetohydrodynamic modeling of current-drive-induced sawtooth-like crashes in the W7-X stellarator |
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| المؤلفون: | Zhou, Yao, Aleynikova, K., Ferraro, N. M. |
| المصدر: | Phys. Plasmas 30, 032503 (2023) |
| سنة النشر: | 2022 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Plasma Physics |
| الوصف: | Sawtooth-like core electron temperature crashes have been observed in W7-X experiments with electron cyclotron current drive. We present nonlinear single-fluid magnetohydrodynamic simulations of this phenomenon using the newly developed stellarator modeling capability of the M3D-$C^1$ code. The near-axis current drive gives rise to two $\iota=1$ 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-$C^1$. Comment: 8 pages, 8 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0136654 |
| URL الوصول: | http://arxiv.org/abs/2207.08620 |
| رقم الأكسشن: | edsarx.2207.08620 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0136654 |
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