Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography
Abstract Advanced methods, based on the Fourier-Rectangular Function (FRF) series expansion (K. Yamasaki et al., J.Appl. Phys. 126 043304 (2019)), are proposed to analyse plasma images obtained with tomography. The method is applied to images of the entire cross-section of a cylindrical plasma that...
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| Format: | Article |
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Nature Portfolio
2025-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-025-04755-1 |
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| author | Kotaro Yamasaki Akihide Fujisawa Yoshihiko Nagashima Chanho Moon Yusuke Kosuga Makoto Sasaki Daiki Nishimura Taiki Kobayashi Yuichi Kawachi Shigeru Inagaki Naohiro Kasuya Takuma Yamada |
| author_facet | Kotaro Yamasaki Akihide Fujisawa Yoshihiko Nagashima Chanho Moon Yusuke Kosuga Makoto Sasaki Daiki Nishimura Taiki Kobayashi Yuichi Kawachi Shigeru Inagaki Naohiro Kasuya Takuma Yamada |
| author_sort | Kotaro Yamasaki |
| collection | DOAJ |
| description | Abstract Advanced methods, based on the Fourier-Rectangular Function (FRF) series expansion (K. Yamasaki et al., J.Appl. Phys. 126 043304 (2019)), are proposed to analyse plasma images obtained with tomography. The method is applied to images of the entire cross-section of a cylindrical plasma that is dominated by an oscillatory state. The oscillations are characterized by an azimuthal mode of m = 4 (mother mode), whose spatial pattern is modulated by producing child modes (m = 3 and m = 5) through the nonlinear coupling with m = 1 mode (father mode). The proposed methods identify the spatiotemporal properties of the modes and their nonlinear coupling propagation along the amplitude trajectory of the father mode. Here, we report the newly developed analysis methods for tomography images and their capabilities to uncover underlying processes in the oscillatory state of turbulent plasmas. |
| format | Article |
| id | doaj-art-b44db294c1fa421284e5773f3c9833ca |
| institution | DOAJ |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-b44db294c1fa421284e5773f3c9833ca2025-08-20T03:10:36ZengNature PortfolioScientific Reports2045-23222025-06-0115111110.1038/s41598-025-04755-1Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomographyKotaro Yamasaki0Akihide Fujisawa1Yoshihiko Nagashima2Chanho Moon3Yusuke Kosuga4Makoto Sasaki5Daiki Nishimura6Taiki Kobayashi7Yuichi Kawachi8Shigeru Inagaki9Naohiro Kasuya10Takuma Yamada11Graduate School of Advanced Science and Engineering, Hiroshima UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch center for plasma turbulence, Kyushu UniversityNational Institute for Fusion Science, National Institutes of Natural SciencesResearch center for plasma turbulence, Kyushu UniversityGraduate School of Engineering Applied Energy, Nagoya UniversityInstitute of Advanced Energy, Kyoto UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityAbstract Advanced methods, based on the Fourier-Rectangular Function (FRF) series expansion (K. Yamasaki et al., J.Appl. Phys. 126 043304 (2019)), are proposed to analyse plasma images obtained with tomography. The method is applied to images of the entire cross-section of a cylindrical plasma that is dominated by an oscillatory state. The oscillations are characterized by an azimuthal mode of m = 4 (mother mode), whose spatial pattern is modulated by producing child modes (m = 3 and m = 5) through the nonlinear coupling with m = 1 mode (father mode). The proposed methods identify the spatiotemporal properties of the modes and their nonlinear coupling propagation along the amplitude trajectory of the father mode. Here, we report the newly developed analysis methods for tomography images and their capabilities to uncover underlying processes in the oscillatory state of turbulent plasmas.https://doi.org/10.1038/s41598-025-04755-1 |
| spellingShingle | Kotaro Yamasaki Akihide Fujisawa Yoshihiko Nagashima Chanho Moon Yusuke Kosuga Makoto Sasaki Daiki Nishimura Taiki Kobayashi Yuichi Kawachi Shigeru Inagaki Naohiro Kasuya Takuma Yamada Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography Scientific Reports |
| title | Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography |
| title_full | Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography |
| title_fullStr | Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography |
| title_full_unstemmed | Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography |
| title_short | Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography |
| title_sort | advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography |
| url | https://doi.org/10.1038/s41598-025-04755-1 |
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