Plasma and Fusion Research

Volume 19, 1201005 (2024)

Rapid Communications

Velocity Field Estimation using Tomography in a Cylindrical Plasma

Daiki NISHIMURA, Akihide FUJISAWA^1,2), Yoshihiko NAGASHIMA^1,2), Chanho MOON^1,2), Kotaro YAMASAKI³⁾, Takashi NISHIZAWA^1,2), Taiki KOBAYASHI, Tatsuya KOBAYASHI^1,4), Akihiro SHIMIZU^1,4) and Tokihiko TOKUZAWA^1,4)

: Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
1): Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
2): Research Center for Plasma Turbulence Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
3): Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8527, Japan
4): National Institute for Fusion Science, National Institute of Natural Sciences, 322-6 Oroshi, Toki, Gifu 509-5292, Japan

(Received 29 November 2023 / Accepted 9 December 2023 / Published 26 January 2024)

Abstract

This article presents a new method, called extended Rotational Movement Analysis (e-RoMA), to estimate the velocity field of a cylindrical plasma from its two-dimensional images based on Fourier-Bessel function expansion. The proposed method is applied to tomography images of a plasma produced in a linear cylindrical device PANTA and succeeded in obtaining the two- dimensional velocity field. The first results suggest an issue to be investigated, that is, the presence of azimuthal asymmetry in the velocity field.

Keywords

velocimetry, tomography, cylindrical plasma, plasma emission

DOI: 10.1585/pfr.19.1201005

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References

[1] Y.W. Enters et al., Rev. Sci. Instrum. 94, 075101 (2023).
[2] D. Nishimura et al., J. Appl. Phys. 134, 113302 (2023).
[3] K. Yamasaki et al., Rev. Sci. Instrum. 88, 093507 (2017).