Energetic particles transport in constants of motion space due to collisions in tokamak plasmas
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909205808545792 |
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| author | Meng, Guo Lauber, Philipp Lu, Zhixin Bergmann, Andreas Schneider, Mirelle |
| author_facet | Meng, Guo Lauber, Philipp Lu, Zhixin Bergmann, Andreas Schneider, Mirelle |
| contents | The spatio-temporal evolution of the energetic particles in the transport time scale in tokamak plasmas is a key issue of the plasmas confinement, especially in burning plasmas. In order to include sources and sinks and collisional slowing down processes, a new solver, ATEP-3D was implemented to simulate the evolution of the EP distribution in the three-dimensional constants of motion (CoM) space. The Fokker-Planck collision operator represented in the CoM space is derived and numerically calculated. The collision coefficients are averaged over the unperturbed orbits to capture the fundamental properties of EPs. ATEP-3D is fully embedded in ITER IMAS framework and combined with the LIGKA/HAGIS codes. The finite volume method and the implicit Crank-Nicholson scheme are adopted due to their optimal numerical properties for transport time scale studies. ATEP-3D allows the analysis of the particle and power balance with the source and sink during the transport process to evaluate the EP confinement properties. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_10428 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Energetic particles transport in constants of motion space due to collisions in tokamak plasmas Meng, Guo Lauber, Philipp Lu, Zhixin Bergmann, Andreas Schneider, Mirelle Plasma Physics The spatio-temporal evolution of the energetic particles in the transport time scale in tokamak plasmas is a key issue of the plasmas confinement, especially in burning plasmas. In order to include sources and sinks and collisional slowing down processes, a new solver, ATEP-3D was implemented to simulate the evolution of the EP distribution in the three-dimensional constants of motion (CoM) space. The Fokker-Planck collision operator represented in the CoM space is derived and numerically calculated. The collision coefficients are averaged over the unperturbed orbits to capture the fundamental properties of EPs. ATEP-3D is fully embedded in ITER IMAS framework and combined with the LIGKA/HAGIS codes. The finite volume method and the implicit Crank-Nicholson scheme are adopted due to their optimal numerical properties for transport time scale studies. ATEP-3D allows the analysis of the particle and power balance with the source and sink during the transport process to evaluate the EP confinement properties. |
| title | Energetic particles transport in constants of motion space due to collisions in tokamak plasmas |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2405.10428 |