Combination of quasi-isodynamic and piecewise omnigenous magnetic fields
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866912963667951616 |
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| author | Velasco, J. L. Calvo, I. Fernández-Pacheco, V. Padidar, M. Liu, H. Sánchez, E. Yu, G. Zhu, C. |
| author_facet | Velasco, J. L. Calvo, I. Fernández-Pacheco, V. Padidar, M. Liu, H. Sánchez, E. Yu, G. Zhu, C. |
| contents | Due to their simultaneous optimization for radial and parallel neoclassical transport, quasi-isodynamic fields have been the main choice of stellarator magnetic configuration for most fusion reactor candidates in recent years. However, achieving a high degree of quasi-isodynamicity often comes at the cost of a strong shaping of the flux surfaces of the stellarator and complex coil geometries. In this work, the concepts of quasi-isodynamicity and piecewise omnigenity are combined to form QI-pwO fields. These fields are quasi-isodynamic in the low-field region of the magnetic surface, whereas they significantly depart from quasi-isodynamicity in the high-field region without sacrificing the neoclassical transport properties of quasi-isodynamic fields. This departure could make it easier to integrate the optimization of neoclassical transport with other physical and technological aspects of a stellarator reactor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_12377 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Combination of quasi-isodynamic and piecewise omnigenous magnetic fields Velasco, J. L. Calvo, I. Fernández-Pacheco, V. Padidar, M. Liu, H. Sánchez, E. Yu, G. Zhu, C. Plasma Physics Due to their simultaneous optimization for radial and parallel neoclassical transport, quasi-isodynamic fields have been the main choice of stellarator magnetic configuration for most fusion reactor candidates in recent years. However, achieving a high degree of quasi-isodynamicity often comes at the cost of a strong shaping of the flux surfaces of the stellarator and complex coil geometries. In this work, the concepts of quasi-isodynamicity and piecewise omnigenity are combined to form QI-pwO fields. These fields are quasi-isodynamic in the low-field region of the magnetic surface, whereas they significantly depart from quasi-isodynamicity in the high-field region without sacrificing the neoclassical transport properties of quasi-isodynamic fields. This departure could make it easier to integrate the optimization of neoclassical transport with other physical and technological aspects of a stellarator reactor. |
| title | Combination of quasi-isodynamic and piecewise omnigenous magnetic fields |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2603.12377 |