Updated on 2023/01/23

写真a

 
KUWAHARA Akira
 
Organization
Graduate School of Engineering Applied Energy 2 Assistant Professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Energy Science and Engineering
Title
Assistant Professor
Contact information
メールアドレス
External link

Degree 1

  1. 博士(工学) ( 2019.9   静岡大学 ) 

Research Areas 6

  1. Energy Engineering / Applied plasma science

  2. Energy Engineering / Nuclear engineering

  3. Nanotechnology/Materials / Energy chemistry

  4. Energy Engineering / Earth resource engineering, Energy sciences

  5. Energy Engineering / Nuclear engineering

  6. Nanotechnology/Materials / Analytical chemistry

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Research History 1

  1. Japan Atomic Energy Agency

    2013.4 - 2020.1

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    Country:Japan

Education 1

  1. Shizuoka University   Graduate School, Division of Engineering

    - 2019.9

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    Country: Japan

Professional Memberships 3

  1. 日本原子力学会

  2. 日本鉄鋼協会

  3. THE JAPAN SOCIETY OF APPLIED PHYSICS

Committee Memberships 1

  1. 日本原子力学会北関東支部   幹事  

    2019.4 - 2020.1   

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    Committee type:Academic society

Awards 6

  1. Outstanding Poster Awards

    2018.1   2018 Winter Conference on Plasma Spectrochemistry  

    Akira Kuwahara

  2. 一般の部 優秀発表賞

    2017.4   平成29年度北関東支部原子力学会若手研究発表会  

    桑原 彬

  3. 一般の部 優秀発表賞

    2016.4   平成28年度北関東支部原子力学会若手研究発表会  

  4. 日本機械学会三浦賞

    2013.3  

  5. 学生セッション最優秀賞

    2012.11   第56回宇宙科学技術連合講演会  

  6. 最優秀ポスター賞

    2011.10   Young Researcher Workshop 2011  

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Papers 8

  1. Doppler splitting and expansion dynamics of laser-produced plasma plume under a high vacuum ambience Reviewed

    Akira Kuwahara, Kenta Murakami, Hideki Tomita, Kayo Sawada, Youichi Enokida

    Journal of Analytical Atomic Spectrometry   Vol. 37 ( 10 ) page: 2033 - 2041   2022.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    Doppler splitting appeared after the plume front passed because of the formation of the contact layer and quasi-cavity in the plasma plume and the movement of atoms in the lateral direction at a high vacuum.

    DOI: 10.1039/d2ja00177b

    Web of Science

    Scopus

  2. Electrodeless hydrogen production from seawater using femtosecond laser pulses Reviewed

    Akira Kuwahara, Yuki Mizushima, Makoto Matsui, Tomoki Kozuka, Nobuyuki Mase

    RSC Advances   Vol. 12 ( 15 ) page: 9304 - 9309   2022.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    This study presents the first experimental evidence of direct H<sub>2</sub> production from seawater without harmful gas emissions (e.g., CO<sub>2</sub>, Cl<sub>2</sub>), which uses multiphoton ionization water splitting with a femtosecond pulse laser.

    DOI: 10.1039/d2ra01337a

    Web of Science

    Scopus

    PubMed

    CiNii Research

  3. Lamb-Dip Laser-Induced Fluorescence Spectroscopy in a Supersonic Plasma Jet for Isotope Identification

    Akira Kuwahara

    ISIJ International   Vol. 62 ( 9 ) page: 1967 - 1969   2022

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Iron and Steel Institute of Japan  

    <p>Isotope analysis is challenging because spectral resolution is reduced in high-temperature plasma. In this study, a method involving Lamb-dip laser-induced fluorescence spectroscopy combined with a supersonic plasma jet was developed for the detection of strontium (Sr) isotopes. This newly developed system, with a counter-propagating laser configuration to provide an incident laser beam intensity of 61.8 mW mm<sup>−2</sup>, selectively detected the Lamb-dip of <sup>88</sup>Sr using a spectral frequency width of 35 MHz.</p>

    DOI: 10.2355/isijinternational.ISIJINT-2022-080

    Web of Science

    Scopus

    CiNii Research

  4. Plasma Atomization of Strontium Chloride Powder by a Supersonic Plasma Jet and Measurement of Its Efficiency Using Diode Laser Absorption Spectroscopy Reviewed

    Akira Kuwahara, Yasuaki Aiba, Makoto Matsui

    ACS Omega   Vol. 6 ( 17 ) page: 11750 - 11755   2021.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsomega.1c01094

    Web of Science

    Scopus

    PubMed

  5. Temperature Difference Between Gas Species In Absorption Measurements Using Diode Laser Absorption Spectroscopy And The Effect On Temperature Reduction Reviewed

    Akira Kuwahara

    Atomic Spectroscopy   Vol. 42 ( 3 ) page: 134 - 140   2021

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Atomic Spectroscopy Press Limited  

    DOI: 10.46770/AS.2021.006

    Web of Science

    Scopus

  6. High spectral resolution of diode laser absorption spectroscopy for isotope analysis using a supersonic plasma jet Reviewed

    Akira Kuwahara, Yasuaki Aiba, Shinya Yamasaki, Takuya Nankawa, Makoto Matsui

    Journal of Analytical Atomic Spectrometry   Vol. 33   page: 1150-1153   2018.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry ({RSC})  

    DOI: 10.1039/C8JA00120K

  7. Development of an isotope analysis method based on diode laser absorption spectroscopy using an arc-jet plasma wind tunnel Reviewed

    Akira Kuwahara, Yasuaki Aiba, Takuya Nankawa, Makoto Matsui

    Journal of Analytical Atomic Spectrometry   Vol. 33 ( 5 ) page: 893 - 896   2018.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry  

    Radioactive isotopes in nuclear fuel and radioactive waste must be quantified for safety control and management of various nuclear facilities. In this study, an isotope analysis method based on diode laser absorption spectroscopy by using an arc-jet plasma wind tunnel is developed for rapid analysis without sample preparation and sophisticated maintenance. The translational temperature and flow velocity downstream of a supersonic nozzle are measured using an atomic argon transition of 826.45 nm from an excited state, and then, the temperature upstream of the nozzle is estimated using the two measured values. Next, the trace gas measurement capability is verified by injecting natural xenon into argon plasma, and optical measurements are carried out at an atomic xenon transition to 823.16 nm from a metastable state. The detection limit of xenon over the argon molar ratio is estimated to be 140 parts per million downstream.

    DOI: 10.1039/c8ja00040a

    Scopus

  8. Development of vacuum ultraviolet absorption spectroscopy system for wide measurement range of number density using a dual-tube inductively coupled plasma light source Reviewed

    Akira Kuwahara, Makoto Matsui, Yoshiki Yamagiwa

      Vol. 83   page: 123105   2012.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.4770118

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MISC 1

  1. 真空紫外吸収分光法におけるプローブ光プロファイルの評価と数密度測定への影響 Reviewed

    桑原彬,松井信,山極芳樹

    プラズマ応用科学   Vol. 20 ( 2 ) page: 130-134   2012.12

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    Language:Japanese  

Presentations 19

  1. Spectroscopic measurement of laser ablation plume under a high vacuum ambience and its application to resonance ionization mass spectrometry Invited

    Akira Kuwahara

    Workshop on laser spectroscopy/analysis of radioactive isotope and related topics  2022.10.20 

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    Event date: 2022.10

    Language:English   Presentation type:Symposium, workshop panel (nominated)  

  2. Preliminary experiments of hydrogen production from water using nano-second YAG laser

    Shu Inoue, Akira Kuwahara, Yuki Mizushima, Makoto Matsui, Nobuyuki Mase

    15 th International Workshop on Plasma Application and Hybrid Functionally Materials 

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    Event date: 2022.3

    Language:English  

  3. フェムト秒レーザーを用いた海水からの直接水素製造法の開発

    第69回応用物理学会春季学術講演会  2022.3.22 

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    Event date: 2022.3

  4. A newly developed method of direct hydrogen production from seawater using femtosecond pulse laser International conference

    Mizushima Yuki, Kuwahara Akira, Matsui Makoto, Kozuka Tomoki, Mase Nobuyuki

    International Chemical Engineering Symposia 2022  2022.3.18 

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    Event date: 2022.3

    Language:English  

  5. 15wt%Na2O-38B2O3-47SiO2ガラスへのモリブデンの溶解

    南部篤史,澤田佳代,桑原彬,榎田洋一

    日本原子力学会中部支部第53回研究発表会  2021.12.16 

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    Event date: 2021.12

  6. 燃料再処理の液液抽出プロセスにおけるプルトニウムの蓄積に関する研究

    池田 怜央,澤田 佳代,桑原 彬,榎田 洋一

    日本原子力学会中部支部第53回研究発表会  2021.12.16 

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    Event date: 2021.12

  7. ステンレス鋼の鉛ホウ酸ガラスによる酸化溶解

    勝見 泰裕,澤田 佳代,桑原 彬,榎田 洋一

    日本原子力学会中部支部第53回研究発表会  2021.12.16 

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    Event date: 2021.12

  8. 低圧化におけるアブレーションプルーム中のAl原子のレーザー吸収分光計

    村上 健太,桑原 彬,澤田 佳代,榎田 洋一

    日本原子力学会中部支部第53回研究発表会  2021.12.16 

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    Event date: 2021.12

  9. 汚染水処理で発生した廃ゼオライトのガラス固化に関する研究

    山中友貴,澤田佳代,桑原彬,榎田洋一

    日本原子力学会中部支部第53回研究発表会   2021.12.16 

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    Event date: 2021.12

  10. 廃ゼオライトのガラス固化における結晶生成に関する研究

    知識 嵩瑛,桑原 彬,榎田 洋一

    日本原子力学会中部支部第53回研究発表会   2021.12.16 

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    Event date: 2021.12

  11. Novel Isotope Analysis Method Using a Supersonic Plasma Jet Combined with Diode Laser Absorption Spectroscopy Invited International conference

    Akira Kuwahara

    5th Asia-Pacific Conference on Plasma Physics  2021.9.29 

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    Event date: 2021.9 - 2021.10

    Language:English   Presentation type:Oral presentation (invited, special)  

  12. レーザー共鳴イオン化質量分析のためのレーザーアブレーション原子化の基礎検討

    桑原 彬、村上 健太、富田 英生、榎田 洋一

    日本原子力学会2021年秋の大会  2021.9.8 

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    Event date: 2021.9

  13. 超音速プラズマ風洞を利用した革新的な元素・同位体分析技術 Invited

    桑原彬

    未来2020 

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    Event date: 2019.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  14. New Approach for Isotope Analysis Using Supersonic Plasma Jet Combined with Laser Absorption Spectroscopy Invited International conference

    Akira Kuwahara, Takuya Nankawa, Makoto Matsui

    7th Annual Conference of AnalytiX-2019 

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    Event date: 2019.4

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Singapore  

  15. アークジェットによる運動方向を制御したアルゴンプラズマを対象としたレーザー誘起蛍光分光システ ムの開発

    早川禎一郎、桑原彬、澤田佳代、榎田洋一

    日本原子力学会中部支部第52回研究発表会  2020.12.18 

  16. 同位体分析を目的とした超音速プラズマ中のストロンチウム蛍光スペクトル測定

    桑原彬、早川禎一郎、澤田佳代、榎田洋一

    日本原子力学会2021年春の年会  2021.3.18 

  17. Extraction of palladium with di-n-hexyl sulfide by micro bubble generator

    Chenyu Zhou、Kayo Sawada、Akira Kuwahara、Youichi Enokida

    2020.12.18 

  18. ガラスへのモリブデンの溶解にガラス母材比表面積が与える影響

    嶋倉匠海、澤田佳代、桑原彬、榎田洋一

    日本原子力学会中部支部第52回研究発表会  2020.12.18 

  19. セシウム吸着ゼオライトのガラス固化処理における結晶形成に及ぼすB2O3添加の影響

    氣田雅大、澤田佳代、桑原彬、榎田洋一

    日本原子力学会中部支部第52回研究発表会  2020.12.18 

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Research Project for Joint Research, Competitive Funding, etc. 6

  1. 極短パルスレーザーを用いた水素製造技術の事業化に向けた性能向上に関する検証

    2022.8 - 2023.3

    START大学エコシステム推進型GAPファンドプログラム 

  2. 原子運動制御に基づくレーザー誘起蛍光法を利用した鉄鋼中の元素・同位体分析法の開発

    2021.4 - 2023.3

    鉄鋼研究振興助成 

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    Authorship:Principal investigator 

  3. 光導波路フィルムを用いた水膜厚・波速度・温度の同時分布計測センサーの開発

    2021.4 - 2023.3

    中部電力原子力安全技術研究所公募研究(一般) 

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    Authorship:Coinvestigator(s) 

  4. Plasma Atomization of Strontium Chloride Powder by a Supersonic Plasma Jet and Measurement of Its Efficiency Using Diode Laser Absorption Spectroscopy

    2021.4 - 2022.3

    公益財団法人中部電気利用基礎研究振興財団  出版助成 

  5. 高温プラズマ中でのレーザー分光を利用した全試料対応型の万能分析法の開発

    2017.4 - 2019.3

    環境総合研究推進費 

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    Grant type:Competitive

  6. プラズマ風洞を用いた同位体比分析法の開発

    2015.10 - 2016.9

    公益財団法人谷川熱技術振興基金  平成27年度研究助成金 

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KAKENHI (Grants-in-Aid for Scientific Research) 4

  1. RIMS for uranium isotope analysis

    Grant number:21H01858  2021.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\17160000 ( Direct Cost: \13200000 、 Indirect Cost:\3960000 )

  2. 光共振器内の吸収飽和現象を利用した革新的な同位体分析法の開発

    2018.4 - 2021.3

    科研費(若手研究) 

    桑原 彬

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    Authorship:Principal investigator  Grant type:Competitive

  3. Development of a game-changing isotope analysis method using absorption saturation phenomena in an optical cavity

    Grant number:18K14162  2018.4 - 2021.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Kuwahara Akira

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    Authorship:Principal investigator 

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    A novel laser spectroscopic system consisting of an optical cavity has been developed to achieves high sensitivity and high wavelength resolution by causing absorption saturation. In this study, we demonstrated the feasibility of absorption saturation by experimental and theoretical approaches. First, we confirmed experimentally that the peak intensity of an absorption profile decreased by a few percent due to absorption saturation of an atomic-electronic transition at the incident beam intensity of 2 mW into the optical cavity. Next, two numerical models of cavity ring-down spectroscopy were proposed and their results suggest that the initial saturation and its relaxation process in a ring-down signal can be observed under a few mW of the incident laser beam intensity.

  4. 超音速プラズマ風洞を用いた同位体比分析法の開発と極低温プラズマによる高分解能化

    2016.4 - 2018.3

    科研費(挑戦的萌芽研究) 

    桑原 彬

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    Authorship:Principal investigator  Grant type:Competitive

Industrial property rights 2

  1. 水素ガス製造方法および水素ガス製造装置

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    Application no:2021-200814  Date applied:2021.12

  2. 同位体分析装置及び同位体分析方法

    桑原彬,南川卓也,藤平俊夫,松井信

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    Application no:特願2017-064440  Date applied:2017.3

    Announcement no:公開2018-169179 

    Patent/Registration no:6918307  Date registered:2021.7 

    Country of applicant:Domestic