Academic Journal
Design of quasi-axisymmetric stellarators with varying-thickness permanent magnets based on Fourier and surface magnetic charges method
| العنوان: | Design of quasi-axisymmetric stellarators with varying-thickness permanent magnets based on Fourier and surface magnetic charges method |
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| المؤلفون: | Xu, G.S., Lu, Z.Y., Chen, D.H., Chen, L., Zhang, X.Y., Wu, X.Q., Ye, M.Y., Wan, B.N. |
| المساهمون: | National Natural Science Foundation of China |
| المصدر: | Nuclear Fusion ; volume 61, issue 2, page 026025 ; ISSN 0029-5515 1741-4326 |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2021 |
| الوصف: | To obtain engineering-feasible designs of stellarators with permanent magnets and simplified coils, a new algorithm has been developed based on Fourier decomposition and surface magnetic charges method. The strong toroidal fields in a quasi-axisymmetric stellarator are still generated by coils. The permanent magnets are designed to compensate the normal magnetic field B n on the plasma surface ∂ P created by the coils and plasma. The normal magnetic fields created by the permanent magnets B pmn are calculated as the difference between the magnetic fields created by the surface magnetic charges on the inner surface ∂ D and the outer surface ∂ D h of the magnets. The Fourier coefficients of the magnet thickness function h θ , ϕ are computed through matrix division operation based on the least square principle with dominant Fourier components selected through 2D Fourier transformation of B pmn . The residual uncompensated B n is minimized through iteration to progressively optimize the thickness function. This new algorithm has been successfully applied to design the permanent magnets of an l = 2 quasi-axisymmetric stellarator with background magnetic field created by 12 identical circular planar coils for demonstrations. High accuracy has been achieved, allowing for a flux-surface-averaged residual B n relative to the total field B n / B ∼ 1.3 × 1 0 − 5 and a maximum residual B n of less than 2 Gs for ∼1 T total field. This new design has some advantages in engineering implementations: all permanent magnet pieces have the same remanence B r ; only one single layer of magnets are mounted perpendicular to the winding surface; the magnets can be easily inserted into the cells of a gridded frame attached to the winding surface and fixed with springs from the back, which greatly simplifies the manufacture, assembly and maintenance of the magnets, and thus ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| DOI: | 10.1088/1741-4326/abcdb6 |
| DOI: | 10.1088/1741-4326/abcdb6/pdf |
| الاتاحة: | http://dx.doi.org/10.1088/1741-4326/abcdb6 https://iopscience.iop.org/article/10.1088/1741-4326/abcdb6 https://iopscience.iop.org/article/10.1088/1741-4326/abcdb6/pdf |
| Rights: | https://creativecommons.org/licenses/by/3.0/ ; https://iopscience.iop.org/info/page/text-and-data-mining |
| رقم الانضمام: | edsbas.AD243047 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/1741-4326/abcdb6 |
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