Fast ion confinement in quasi-axisymmetric stellarator equilibria
This report presents an initial analysis of the fast ion confinement and losses within quasi-axisymmetric stellarator equilibria in consideration by Thea Energy. The equilibria have not yet been explicitly optimized for fast particle confinement and require validation. Modeling with the ASCOT5 code...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/ada56d |
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| author | P.J. Bonofiglo D.W. Dudt C.P.S. Swanson |
| author_facet | P.J. Bonofiglo D.W. Dudt C.P.S. Swanson |
| author_sort | P.J. Bonofiglo |
| collection | DOAJ |
| description | This report presents an initial analysis of the fast ion confinement and losses within quasi-axisymmetric stellarator equilibria in consideration by Thea Energy. The equilibria have not yet been explicitly optimized for fast particle confinement and require validation. Modeling with the ASCOT5 code is used to directly examine the fast ion transport. The particle tracking simulations are purely (neo)classical in nature and simply contain the supplied equilibrium and collisions (pitch-angle, energy slowing, and velocity diffusion) from supplied thermal profiles. Uniform marker deposition is used to probe the general confinement properties of the equilibria while a realistic beam-born population is provided from the BEAMS3D code and an alpha particle population is calculated from a fusion source integrator. A first wall is included and defines the loss boundary. Analysis for NBI ions within Thea Energy’s conceptual Eos neutron source are presented along with alpha particles in an enlarged DT-plasma. The fast ions are assessed in regards to their confinement time, pitch, energy, and spatial coordinates. For each population, the impact of collisions and orbit drifts are discussed. It is found that NBI born ions in Eos are strongly confined until slowing-down, owing largely to the tangential injection geometry, while 22% of DT-born alpha energy is lost in the scaled device, indicating that any fusion pilot plant design optimization should include metrics for fast ion confinement. |
| format | Article |
| id | doaj-art-64f8c4457314470fbf84eee80881069c |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-64f8c4457314470fbf84eee80881069c2025-01-28T12:13:36ZengIOP PublishingNuclear Fusion0029-55152025-01-0165202605010.1088/1741-4326/ada56dFast ion confinement in quasi-axisymmetric stellarator equilibriaP.J. Bonofiglo0https://orcid.org/0000-0001-5057-7383D.W. Dudt1C.P.S. Swanson2https://orcid.org/0000-0003-0231-8525Princeton Plasma Physics Laboratory , Princeton, NJ 08543, United States of AmericaThea Energy , Princeton, NJ 08543, United States of AmericaThea Energy , Princeton, NJ 08543, United States of AmericaThis report presents an initial analysis of the fast ion confinement and losses within quasi-axisymmetric stellarator equilibria in consideration by Thea Energy. The equilibria have not yet been explicitly optimized for fast particle confinement and require validation. Modeling with the ASCOT5 code is used to directly examine the fast ion transport. The particle tracking simulations are purely (neo)classical in nature and simply contain the supplied equilibrium and collisions (pitch-angle, energy slowing, and velocity diffusion) from supplied thermal profiles. Uniform marker deposition is used to probe the general confinement properties of the equilibria while a realistic beam-born population is provided from the BEAMS3D code and an alpha particle population is calculated from a fusion source integrator. A first wall is included and defines the loss boundary. Analysis for NBI ions within Thea Energy’s conceptual Eos neutron source are presented along with alpha particles in an enlarged DT-plasma. The fast ions are assessed in regards to their confinement time, pitch, energy, and spatial coordinates. For each population, the impact of collisions and orbit drifts are discussed. It is found that NBI born ions in Eos are strongly confined until slowing-down, owing largely to the tangential injection geometry, while 22% of DT-born alpha energy is lost in the scaled device, indicating that any fusion pilot plant design optimization should include metrics for fast ion confinement.https://doi.org/10.1088/1741-4326/ada56dstellaratorquasiaxisymmetryenergetic particlesconfinement |
| spellingShingle | P.J. Bonofiglo D.W. Dudt C.P.S. Swanson Fast ion confinement in quasi-axisymmetric stellarator equilibria Nuclear Fusion stellarator quasiaxisymmetry energetic particles confinement |
| title | Fast ion confinement in quasi-axisymmetric stellarator equilibria |
| title_full | Fast ion confinement in quasi-axisymmetric stellarator equilibria |
| title_fullStr | Fast ion confinement in quasi-axisymmetric stellarator equilibria |
| title_full_unstemmed | Fast ion confinement in quasi-axisymmetric stellarator equilibria |
| title_short | Fast ion confinement in quasi-axisymmetric stellarator equilibria |
| title_sort | fast ion confinement in quasi axisymmetric stellarator equilibria |
| topic | stellarator quasiaxisymmetry energetic particles confinement |
| url | https://doi.org/10.1088/1741-4326/ada56d |
| work_keys_str_mv | AT pjbonofiglo fastionconfinementinquasiaxisymmetricstellaratorequilibria AT dwdudt fastionconfinementinquasiaxisymmetricstellaratorequilibria AT cpsswanson fastionconfinementinquasiaxisymmetricstellaratorequilibria |