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| Main Authors: | , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2409.16980 |
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| _version_ | 1866913517799473152 |
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| author | Antonenas, Y. Anastassiou, G. Kominis, Y. |
| author_facet | Antonenas, Y. Anastassiou, G. Kominis, Y. |
| contents | Symmetry-breaking perturbations in axisymmetric toroidal plasma configurations have a drastic impact on particle, energy, and momentum transport in fusion devices, thereby affecting their confinement properties. The perturbative modes strongly affect particles with specific kinetic characteristics through resonant mode-particle interactions. In this work we present an analytical calculation of the kinetic q factor enabling the identification of particles with kinetic properties that meet the resonant conditions. This allows us to predict the locations and structures of the corresponding resonant island-chains, as well as the existence of transport barriers in the particle phase space. The analytical results, derived for the case of a large aspect ratio configuration, are systematically compared to numerical simulations, and their domain of validity is thoroughly investigated and explained. Our findings demonstrate that calculating the kinetic q factor and its dependence on both particle and magnetic field characteristics, provides a valuable tool for understanding and predicting the resonant plasma response to non-axisymmetric perturbations. Moreover, this approach can be semi-analytically applied to generic realistic experimental equilibria, offering a low-computational-cost method for scenario investigations under various multiscale perturbative modes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_16980 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Analytical calculation of the kinetic q factor and resonant response of toroidally confined plasmas Antonenas, Y. Anastassiou, G. Kominis, Y. Plasma Physics Chaotic Dynamics Symmetry-breaking perturbations in axisymmetric toroidal plasma configurations have a drastic impact on particle, energy, and momentum transport in fusion devices, thereby affecting their confinement properties. The perturbative modes strongly affect particles with specific kinetic characteristics through resonant mode-particle interactions. In this work we present an analytical calculation of the kinetic q factor enabling the identification of particles with kinetic properties that meet the resonant conditions. This allows us to predict the locations and structures of the corresponding resonant island-chains, as well as the existence of transport barriers in the particle phase space. The analytical results, derived for the case of a large aspect ratio configuration, are systematically compared to numerical simulations, and their domain of validity is thoroughly investigated and explained. Our findings demonstrate that calculating the kinetic q factor and its dependence on both particle and magnetic field characteristics, provides a valuable tool for understanding and predicting the resonant plasma response to non-axisymmetric perturbations. Moreover, this approach can be semi-analytically applied to generic realistic experimental equilibria, offering a low-computational-cost method for scenario investigations under various multiscale perturbative modes. |
| title | Analytical calculation of the kinetic q factor and resonant response of toroidally confined plasmas |
| topic | Plasma Physics Chaotic Dynamics |
| url | https://arxiv.org/abs/2409.16980 |