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プリンストンプラズマ物理研究所(PPPL)との国際共同研究です. H. Sekine, A. Diallo, S. Abe, Y. Raitses, and H. Koizumi, "Application of Helium Line Intensity Ratio Spectroscopy to Xenon Plasma in E × B Penning Discharge," Plasma Sources Sci. Technol. 33, 045004 (2024), doi: 10.1088/1361-6595/ad3847