Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmas
The propagation of a wave in a medium is generally affected when the medium is moving with respect to the observer. Because plasma equilibria often involve plasma flows, for instance in astrophysics or in magnetic confinement nuclear fusion devices, understanding the effect of motion on plasma waves...
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Académie des sciences
2025-01-01
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| Series: | Comptes Rendus. Physique |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.218/ |
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| author | Braud, Aymeric Langlois, Julien Gueroult, Renaud |
| author_facet | Braud, Aymeric Langlois, Julien Gueroult, Renaud |
| author_sort | Braud, Aymeric |
| collection | DOAJ |
| description | The propagation of a wave in a medium is generally affected when the medium is moving with respect to the observer. Because plasma equilibria often involve plasma flows, for instance in astrophysics or in magnetic confinement nuclear fusion devices, understanding the effect of motion on plasma waves is important. Meanwhile, the presence of a background magnetic field in a plasma makes it anisotropic. To address this problem, we derive here ray tracing equations for the trajectory of rays propagating in a moving anisotropic medium. The proposed approach is to use an effective dispersion relation for the moving medium as seen from the laboratory, obtained by performing a Lorentz transformation of the dispersion relation known for the medium at rest. This formalism is illustrated by considering the low frequency Alfvén waves and the standard ordinary and extraordinary modes in a magnetized plasma at rest. |
| format | Article |
| id | doaj-art-bd39ee54a2e6415fb4880d55090579fb |
| institution | Kabale University |
| issn | 1878-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Physique |
| spelling | doaj-art-bd39ee54a2e6415fb4880d55090579fb2025-02-07T13:54:44ZengAcadémie des sciencesComptes Rendus. Physique1878-15352025-01-0126G172310.5802/crphys.21810.5802/crphys.218Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmasBraud, Aymeric0https://orcid.org/0009-0008-8802-7393Langlois, Julien1https://orcid.org/0009-0008-8387-9247Gueroult, Renaud2https://orcid.org/0000-0001-5208-9594LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 31062 Toulouse, FranceLAPLACE, Université de Toulouse, CNRS, INPT, UPS, 31062 Toulouse, FranceLAPLACE, Université de Toulouse, CNRS, INPT, UPS, 31062 Toulouse, FranceThe propagation of a wave in a medium is generally affected when the medium is moving with respect to the observer. Because plasma equilibria often involve plasma flows, for instance in astrophysics or in magnetic confinement nuclear fusion devices, understanding the effect of motion on plasma waves is important. Meanwhile, the presence of a background magnetic field in a plasma makes it anisotropic. To address this problem, we derive here ray tracing equations for the trajectory of rays propagating in a moving anisotropic medium. The proposed approach is to use an effective dispersion relation for the moving medium as seen from the laboratory, obtained by performing a Lorentz transformation of the dispersion relation known for the medium at rest. This formalism is illustrated by considering the low frequency Alfvén waves and the standard ordinary and extraordinary modes in a magnetized plasma at rest.https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.218/geometrical opticsray tracinglight-draggingplasma flowmoving dieletric |
| spellingShingle | Braud, Aymeric Langlois, Julien Gueroult, Renaud Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmas Comptes Rendus. Physique geometrical optics ray tracing light-dragging plasma flow moving dieletric |
| title | Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmas |
| title_full | Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmas |
| title_fullStr | Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmas |
| title_full_unstemmed | Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmas |
| title_short | Geometrical optics methods for moving anisotropic media: a tool for magnetized plasmas |
| title_sort | geometrical optics methods for moving anisotropic media a tool for magnetized plasmas |
| topic | geometrical optics ray tracing light-dragging plasma flow moving dieletric |
| url | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.218/ |
| work_keys_str_mv | AT braudaymeric geometricalopticsmethodsformovinganisotropicmediaatoolformagnetizedplasmas AT langloisjulien geometricalopticsmethodsformovinganisotropicmediaatoolformagnetizedplasmas AT gueroultrenaud geometricalopticsmethodsformovinganisotropicmediaatoolformagnetizedplasmas |