Optimizing Particle Transport for Enhanced Confinement in Quasi-Isodynamic Stellarators
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909709460570112 |
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| author | Navarro, A. Bañón Di Siena, A. Jenko, F. Merlo, A. Laude, E. |
| author_facet | Navarro, A. Bañón Di Siena, A. Jenko, F. Merlo, A. Laude, E. |
| contents | Despite significant advances in reducing turbulent heat losses, modern quasi-isodynamic (QI) stellarators -- such as Stellaris -- continue to suffer from poor particle confinement, which fundamentally limits their overall performance. Using gyrokinetic simulations within the GENE--Tango framework, we identify suppressed inward thermodiffusion, caused by unfavorable magnetic geometry, as the primary cause. To overcome this limitation, we design a new configuration with a reduced mirror ratio, which enhances the contribution of passing electrons to the inward particle flux. This facilitates the formation of strongly peaked density profiles, suppresses turbulence, and leads to a substantial improvement in confinement. Our optimized configuration achieves nearly a twofold increase in energy confinement compared to Stellaris, highlighting the crucial role of optimizing particle transport in next-generation stellarator designs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_21003 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optimizing Particle Transport for Enhanced Confinement in Quasi-Isodynamic Stellarators Navarro, A. Bañón Di Siena, A. Jenko, F. Merlo, A. Laude, E. Plasma Physics Despite significant advances in reducing turbulent heat losses, modern quasi-isodynamic (QI) stellarators -- such as Stellaris -- continue to suffer from poor particle confinement, which fundamentally limits their overall performance. Using gyrokinetic simulations within the GENE--Tango framework, we identify suppressed inward thermodiffusion, caused by unfavorable magnetic geometry, as the primary cause. To overcome this limitation, we design a new configuration with a reduced mirror ratio, which enhances the contribution of passing electrons to the inward particle flux. This facilitates the formation of strongly peaked density profiles, suppresses turbulence, and leads to a substantial improvement in confinement. Our optimized configuration achieves nearly a twofold increase in energy confinement compared to Stellaris, highlighting the crucial role of optimizing particle transport in next-generation stellarator designs. |
| title | Optimizing Particle Transport for Enhanced Confinement in Quasi-Isodynamic Stellarators |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2507.21003 |