Journal Paper

• Yosuke Shimada, Hiroshi Akatsuka. Evaluation of relaxation to steady state using a collisionalradiative model based on the analogy of transfer entropy, Physics of Plasmas, AIP Publishing, Vol. 32, Issue 8, 080703, Aug. 2025.  Official location  
• Koji Kikuchi, Hiroshi Akatsuka. Definition of electron temperature of nonequilibrium plasma based on Tsallis and Rényi entropy maximization principles, Physical Review E, Americal Physical Society, Vol. 112, No. 1, 015201, July 2025.  Official location  
• Hiroshi Akatsuka, Ryo Nakanishi, Atsushi Nezu, Shinsuke Mori. Effect of nitrogen admixture to underwater argon arc discharge plasma for nuclear decommissioning, International Symposium on Zero-Carbon Energy Systems (IZES), Progress in nuclear science and technology, Atomic Energy Sosciety of Japan, Vol. 7, pp. 182-188, Mar. 2025.  Official location  

International Conference (Reviewed)

• Yosuke Shimada, Hiroshi Akatsuka. Evaluation of Plasma Fluctuation Using Stochastic Model Based on Relative Entropy, The International Conference on Phenomena in Ionized Gases (XXXVI ICPIG), Book of abstracts of ICPIG25, International Scientific Committe of ICPIG, p. 339, July 2025.  Official location  
• Koji Kikuchi, Hiroshi Akatsuka. Discussion on electron temperature of non-equilibrium plasma based on Tsallis and Rényi entropies maximization principle, The 29th International Conference on Statistical Physics (STATPHYS29), Proc. the 29th International Conference on Statistical Physics (STATPHYS29), Steering Committee of STATPHYS29, July 2025.  Official location  
• Jun Enomoto, Wataru Kikuchi, Tomoya Taguchi, Nezu Atsushi, Hiroshi Akatsuka. Elucidation of the Nitrogen Blue Afterglow in Atmospheric Pressure Helium Plasma Jet, The International Conference on Phenomena in Ionized Gases (XXXVI ICPIG), Book of abstracts ICPIG2025, International Scientific Committe of ICPIG, p. 161, July 2025.  Official location  
• Koji Kikuchi, Hiroshi Akatsuka. Discussion on the Definition of Excitation Temperature of Weakly Ionized Plasmas in a Non-equilibrium State, The International Conference on Phenomena in Ionized Gases (XXXVI ICPIG), Book of abstracts ICPIG2025, International Scientific Committe of ICPIG, p. 412, July 2025.  Official location  
• Keren Lin, Shinji Yoshimura, Michael K. T. Mo, Wataru Kikuchi, Yuya Yamashita, Jun Enomoto, Motoshi Goto, Hiroshi Akatsuka, Takayoshi Tsutsumi. Experimental and Numerical Investigation of a Large-Diameter Helium APPJ with Floating Electrode Configuration, The International Plasma Technology Joint Conference 2025 (IPTJC2025), Proc. IPTJC2025, Program Committee of the International Plasma Technology Joint Conference 2025 (IPTJC2025), June 2025.  Official location  
• Yuchen Ye, Kenta Doi, Tetsuji Kiyota, Kazuki Shimatani, Ayaki Sakurai, Wentao He, Yuya Yamashita, Wataru Kikuchi, Atsushi Nezu, Hiroshi Akatsuka. Exploring Multiple Solutions of Electron Temperature and Density in the Argon Collisional-Radiative Model Using Monte Carlo Simulations, ISPlasma2025/IC-PLANTS2025, Proceedings of ISPlasma2025/IC-PLANTS2025, Organizing Committee of ISPlasma2025/IC-PLANTS2025, 05P-24, Mar. 2025.  Official location  
• Keren Lin, Shinji Yoshimura, Motoshi Goto, Takayoshi Tsutsumi, Wataru Kikuchi, Jun Enomoto, Hiroshi Akatsuka. Development and Measurement of a Gas Temperature Controllable Atmospheric-Pressure Plasma Jet System for Plasma Bio Research, ISPlasma2025/IC-PLANTS2025, Proceedings of ISPlasma2025/IC-PLANTS2025, Organizing Committee of ISPlasma2025/IC-PLANTS2025, 05P-02, Mar. 2025.  Official location  
• Hiroshi Akatsuka, Shota Yamada, Yuki Morita, Atsushi Nezu. Spectroscopic Study of Rotational Temperatures CO-Excited States in Microwave Discharge CO2 Plasma, International Symposium on Green Transformation Initiative and Innovative Zero-Carbon Energy Systems, GXI-ZES, GXI-ZES_Proceedings_of_Abstracts, Organizing Committee of GXI-ZES, pp. 185-186, Jan. 2025.  Official location  

Domestic Conference (Reviewed)

• Koji Kikuchi, Hiroshi Akatsuka. 一般化エントロピー適用による非平衡プラズマの電子温度指標の高度化, 原子衝突学会 第50回年会, 原子衝突学会 第 50 回年会 講演概要集, 原子衝突学会, p. 35, Aug. 2025.  Official location  
• Koji Kikuchi, Hiroshi Akatsuka. Redefinition of the Temperature of Nonequilibrium Excited-State Distributions Based on Non-Extensive Statistical Mechanics, The 42nd Symposium on Plasma Processing, Proceedings of 42nd Symposium on Plasma Processing, Plasma Electronics Division, Japan Society of Applied Physics, pp. 50-51, Jan. 2025.  Official location  

International Conference (Not reviewed / Unknown)

• Yuchen Ye, Kenta Doi, Tetsuji Kiyota, Wataru Kikuchi, Kazuki Shimatani, Hinata Hanyu, Wentao He, Ayaki Sakurai, Yuya Yamashita, Atsushi Nezu, Hiroshi Akatsuka. Spatial distribution of electron temperature and density in argon RF-biased ICP with non-quasi-neutrality effects, The 78th Annual Gaseous Electronics Conference (GEC2025), Bull. American Phys. Soc., Americal Physical Society, Oct. 2025.  Official location  
• Kazuki Shimatani, Tetsuji Kiyota, Kenta Doi, Yuya Yamashita, Wataru Kikuchi, Kenta Ishi, Yuchen Ye, Ayaki Sakurai, Atsushi Nezu, Hiroshi Akatsuka. Spatial distribution measurement of electron temperature and density of inductively coupled nitrogen plasma by tomographic optical emission spectroscopy, The 78th Annual Gaseous Electronics Conference (GEC2025), Bull. American Phys. Soc., Oct. 2025.  Official location  
• Wataru Kikuchi, Jun Enomoto, Keren Lin, Tomoya Taguchi, Hiroshi Akatsuka. Automated Continuum-Line Spectrum Decomposition for Optical Emission Spectroscopic Diagnostic of Atmospheric-Pressure Plasmas, The 78th Annual Gaseous Electronics Conference (GEC2025), Bull. American Phys. Soc., Americal Physical Society, Oct. 2025.  Official location  
• He Wentao, Tetsuji Kiyota, Kenta Doi, Yuya Yamashita, Wataru Kikuchi, Shuhei Watanabe, Ayaki Sakurai, Yuchen Ye, Kazuki Shimatani, Atsushi Nezu, Hiroshi Akatsuka. Spatially Resolved Parameter-Measurement of Oxygen ICP via Optical Emission Spectroscopy with Tomographic Analysis, The 78th Annual Gaseous Electronics Conference (GEC2025), Bull. American Phys. Soc., Americal Physical Society, Oct. 2025.  Official location  
• Yosuke Shimada, Hiroshi Akatsuka. Evaluation of Fluctuation of Plasmas Diagnosed by Excited-State Population Variation Using Stochastic Model Based on Relative Entropy, The 78th Annual Gaseous Electronics Conference (GEC2025), Bull. American Phys. Soc., Americal Physical Society, Oct. 2025.  Official location  
• Tomoya Taguchi, Wataru Kikuchi, Jun Enomoto, Hiroshi Akatsuka. Diagnosis of electron temperature and density of helium atmospheric-pressure plasma jet by using line intensity ratio, The 78th Annual Gaseous Electronics Conference (GEC2025), Bull. American Phys. Soc., Americal Physical Society, Oct. 2025.  Official location  
• Keren Lin, Shinji Yoshimura, Michael Mo, Wataru Kikuchi, Yuya Yamashita, Jun Enomoto, Motoshi Goto, Hiroshi Akatsuka, Takayoshi Tsutsumi. Investigation of a Large-Diameter Helium Plasma Jet with a Floating Electrode Setup, The 78th Annual Gaseous Electronics Conference (GEC2025), Bull. Americal Phys Soc., Americal Physical Society, Oct. 2025.  Official location  
• Koji Kikuchi, Hiroshi Akatsuka. Reconsideration of unified electron temperature scale via power-law scaling using nonextensive statistical mechanics, 9th Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2025), AAPPS-DPP2025 Program Book, The Division of Plasma Physics, Association of Asia Pacific Physical Societies (AAPPS-DPP), Sept. 2025.  Official location  
• Wataru Kikuchi, Jun Enomoto, Keren Lin, Yuchen Ye, Hiroshi Akatsuka. Spectroscopic Measurement of Atmospheric-pressure Non-equilibrium Ar Plasma Based on Line Spectra under Constraints of Undetected Level Densities, 9th Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2025), AAPPS-DPP2025 Program Book, The Division of Plasma Physics, Association of Asia Pacific Physical Societies (AAPPS-DPP), Sept. 2025.  Official location  
• Hiroshi Akatsuka. Optical Emission Spectroscopic Measurement of Atmospheric-Pressure Plasma by Continuum and Line Emissions with Collisional Radiative Model, 6th European Conference on Plasma Diagnostics (ECPD2025), ECPD 2025 - book of abstracts, Scientific committee of ECPD2025, p. 12, Apr. 2025.  Official location  

Domestic Conference (Not reviewed / Unknown)

• Koji Kikuchi, Hiroshi Akatsuka. Discussion on unified temperature scale for power-law electron energy distribution functions based on Tsallis and Rényi entropy maximization principles, The 80th Annual Meeting of Physical Society of Japan, Extended Abstracts of the 80th Annual Meeting of Physical Society of Japan, The Physical Society of Japan, p. 1174, Sept. 2025.  Official location  
• Hiroshi Akatsuka, Suguru Egawa, Katsumi Ida, Mikiro Yoshinuma, Yusuke Ebihara. Rotational Structure of the First Positive System of Nitrogen Molecules in the Red Aurora Observed in the HySCAI, The 80th Annual Meeting of Physical Society of Japan, Extended Abstracts of the 80th Annual Meeting of Physical Society of Japan, The Physical Society of Japan, p. 1175, Sept. 2025.  Official location  
• Wentao He, Tetsuji Kiyota, Kenta Doi, Hirotoshi Nakao, Tomomitsu Ozeki, Kazuhiro Naiki, Kangbai Li, Shun-ichiro Ohmi, Hiroshi Akatsuka. Spatially resolved measurements of reduced-pressure oxygen ICP by tomographic emission spectroscopy, The 86th JSAP Autumn Meeting 2025, Extended Abstracts of the 86th JSAP Autumn Meeting 2025, Japan Society of Applied Physics, 08-111, Aug. 2025.  Official location  
• Koki Fukumoto, Kenta Doi, Tetsuji Kiyota, Yuya Yamashita, Wataru Kikuchi, Atsushi Nezu, Hiroshi Akatsuka. Spatially averaged spectroscopic measurements of low-pressure argon plasmas and their relationship to local electron temperature and density, The 86th JSAP Autumn Meeting 2025, Extended Abstracts of the 86th JSAP Autumn Meeting 2025, Japan Society of Applied Physics, 08-112, Aug. 2025.  Official location  
• Hiroshi Akatsuka. undamentals of Processing Plasmas and Recent Results of their Spectroscopic Measurements, 第3回 プラズマ・核融合若手夏の学校, 第3回 プラズマ・核融合若手夏の学校 テキスト, プラズマ・核融合若手夏の学校 事務局, Aug. 2025.  Official location  
• Yosuke Shimada, Hiroshi Akatsuka. Examination of steady state for the excitation process of Argon plasma using a collisional-radiative model using Malliavin analysis, The Physical Society of Japan 2025 Spring Meeting, Extended abstracts of the Physical Society of Japan 2025 Spring Meeting, The Physical Society of Japan, p. 758, Mar. 2025.  Official location  
• Ayaki Sakurai, Yuya Yamashita, Yuchen Ye, Kazuki Shimatani, Koki Fukumoto, Atsushi Nezu, Hiroshi Akatsuka. Changes in non - equilibrium properties due to argon contamination of ICP discharge nitrogen plasma, The 2025 Annual Meeting IEE of Japan, Proceedings of the 2025 Annual Meeting IEE of Japan, The Institute of Electrical Engineers of Japan, p. 62, Mar. 2025.
• Koji Kikuchi, Hiroshi Akatsuka. Self-consistent Redefinition of the Excitation Temperature of Non-Equilibrium Plasma based on Nonextensive Statistical Mechanics, The 2025 Annual Meeting IEE of Japan, Proceedings of the 2025 Annual Meeting IEE of Japan, The Institute of Electrical Engineers of Japan, p. 61, Mar. 2025.  Official location  
• Jun Enomoto, Wataru Kikuchi, Tomoya Taguchi, Atsushi Nezu, Hiroshi Akarsuka. Elucidation of the Nitrogen Blue Afterglow in Atmospheric Pressure Helium Plasma Jets, The 72nd JSAP Spring Meeting 2025, Extended Abstracts of the 72nd JSAP Spring Meeting 2025, Japan Society of Applied Physics, 06-098, Mar. 2025.  Official location  
• Koji Kikuchi, Hiroshi Akatsuka. Review of Electron Temperature of Non-Equilibrium Plasma Using a Nonextensive Extension to the Gibbs Entropy, The 72nd JSAP Spring Meeting 2025, Extended Abstracts of the 72nd JSAP Spring Meeting 2025, Japan Society of Applied Physics, 06-073, Mar. 2025.  Official location  
• Wataru Kikuchi, Yuya Yamashita, Yuchen Ye, Jun Enomoto, Hiroshi Akatsuka. Automated line spectrum detection and integration in plasma, The 72nd JSAP Spring Meeting 2025, Exrended Abstracts of the 72nd JSAP Spring Meeting 2025, Japan Society of Applied Physics, 06-072, Mar. 2025.  Official location  
• Hiroshi Akatsuka. Advances in Measurements of Electron Temperature and Density in Low-pressure Plasmas Using Optical Emission Spectroscopy and Data Science Techniques, 第257回 研究集会 ナノ・マイクロファブリケーション研究委員会, シリコンテクノロジー, 応用物理学会シリコンテクノロジー分科会, Feb. 2025.  Official location  

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