TY - JOUR
T1 - Advanced analysis of spatiotemporal behaviors of modal structures and couplings for plasma tomography
AU - Yamasaki, Kotaro
AU - Fujisawa, Akihide
AU - Nagashima, Yoshihiko
AU - Moon, Chanho
AU - Kosuga, Yusuke
AU - Sasaki, Makoto
AU - Nishimura, Daiki
AU - Kobayashi, Taiki
AU - Kawachi, Yuichi
AU - Shigeru, Inagaki
AU - Kasuya, Naohiro
AU - Yamada, Takuma
N1 - Publisher Copyright:
© The Author(s) 2025.
PY - 2025/12
Y1 - 2025/12
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/105007526315
UR - https://www.scopus.com/pages/publications/105007526315#tab=citedBy
U2 - 10.1038/s41598-025-04755-1
DO - 10.1038/s41598-025-04755-1
M3 - Article
C2 - 40473797
AN - SCOPUS:105007526315
SN - 2045-2322
VL - 15
JO - Scientific reports
JF - Scientific reports
IS - 1
M1 - 19751
ER -