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Local Moment Vector Analysis for Quantification of Spatial Pattern Distortion in Tomography Measurement

Taiki KOBAYASHI^1,2), Akihide FUJISAWA^1,2,3), Yoshihiko NAGASHIMA^1,2), Chanho MOON^1,2), Kotaro YAMASAKI⁴⁾, Daiki NISHIMURA³⁾, Sigeru INAGAKI⁵⁾, Akihiro SHIMIZU^1,3), Tokihiko TOKUZAWA^1,3), Takeshi IDO^1,2,3)

1)

Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

2)

Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan

3)

National Institute for Fusion Science, National Institute of Natural Sciences, Toki 509-5292, Japan

4)

Graduate School of Advanced Science and Engineering, Hiroshima University, Higashihiroshima 739-8527, Japan

5)

Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan

(Received 29 January 2026 / Accepted 12 March 2026 / Published 18 June 2026)

Abstract

A tomography system in the PANTA device found fluctuation pattern distortion during a cycle of the solitary wave oscillations, and global moment vector analysis quantified the degree of the distortion successfully. The method can be refined by help of Fourier-Rectangular Function Expansion to analyze local property of the distortion. This article present the method, called the local moment vector analysis, which can evaluate the local distortion of fluctuation patterns, with the results obtained by applying the local method to the solitary wave oscillations.

Copyright (c) 2026 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

linear plasma, tomography, pattern analysis

DOI: 10.1585/pfr.21.1201032

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References

• [1] A. Fujisawa et al., Plasma Phys. Control. Fusion 58, 025005 (2016).
• [2] T.-K. Kobayashi et al., Sci. Rep. 14, 12175 (2024).
• [3] K. Yamasaki et al., J. Appl. Phys. 126, 043304 (2019).
• [4] D. Nishimura et al., J. Appl. Phys. 129, 093301 (2021).