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Enhancement of soft x-ray emission from laser-produced plasma under gas atmosphere

Research Project

Project/Area Number 17K05735
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Plasma science
Research InstitutionNational Institutes for Quantum and Radiological Science and Technology

Principal Investigator

Kishimoto Maki  国立研究開発法人量子科学技術研究開発機構, 量子生命科学領域, 上席研究員(定常) (40360432)

Co-Investigator(Kenkyū-buntansha) 難波 愼一  広島大学, 工学研究科, 教授 (00343294)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsレーザープラズマ / 水の窓軟X線 / 雰囲気ガス / オージェ電子 / X線顕微鏡 / 光放出脱励起 / X線波長変換 / ダウンコンバージョン / 輻射流体シミュレーション / 窒素ガス / 金プラズマ / 軟X線増強 / レーザー / トロイダルミラー / ピンホールカメラ / 軟X線スペクトル / 軟X線顕微鏡 / レーザープラズマ軟X線源 / ガス導入
Outline of Final Research Achievements

We demonstrated drastic enhancement of water-window (WW) soft x-ray from Au laser-produced plasma (LPP) under nitrogen gas atmosphere by use of a joule-energy class compact YAG laser. The WW soft x-ray intensity from Au LPP was 13 times larger than that in vacuum condition at the nitrogen gas pressure of 400 Pa.
Furthermore, we performed similar Au LPP experiments with various gases (O2, Ne, He, Ar) and the yield enhancement of soft x-ray was not observed. From the experimental results, we concluded that the yield enhancement of the WW soft x-rays under nitrogen gas atmosphere is caused by the Auger electron emission from nitrogen molecules by high energy x-rays from the Au LPP and subsequent electron collisional excitation of Au ions and radiative decay.

Academic Significance and Societal Importance of the Research Achievements

申請者らが見出した雰囲気ガス中でのレーザー生成プラズマにおけるオージェ過程を用いたX線波長変換手法は、従来大型レーザー装置を必要とされた水の窓軟X線顕微鏡用軟X線光源の小型化を実現して小型で汎用性のある水の窓軟X線顕微鏡の実用化につながるものであり、これにより生物研究において光学顕微鏡や電子顕微鏡に続く第3の観察ツールを提供できる。
さらにターゲット材料、雰囲気ガス種やレーザー照射条件を最適化することにより水の窓域以外の波長の軟X線増強が可能であることを示すことができ、これにより材料・物性研究や社会インフラ診断、半導体製造等の様々なX線応用分野に革新的X線発生技術を提供することが可能となった。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (13 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 10 results,  Invited: 1 results)

  • [Journal Article] Enhancement of water-window soft x-ray emission from laser-produced Au plasma under low-pressure nitrogen atmosphere2019

    • Author(s)
      John Christian、Kishimoto Maki、Johzaki Tomoyuki、Higashiguchi Takeshi、Kakunaka Noboru、Matsumoto Yasuhiro、Hasegawa Noboru、Nishikino Masaharu、Ejima Takeo、Sunahara Atsushi、Endo Takuma、Namba Shinichi
    • Journal Title

      Optics Letters

      Volume: 44 Issue: 6 Pages: 1439-1442

    • DOI

      10.1364/ol.44.001439

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Observation of Water-Window Soft X-Ray Emission from Laser-Produced Au Plasma Under Vacuum at Various Laser Parameters2019

    • Author(s)
      Christian John , Kishimoto Maki , Higashiguchi Takeshi , Johzaki Tomoyuki , Sunahara Atsushi , Endo Takuma , Ejima Takeo , Namba Shinichi
    • Organizer
      The 11th International Conference on Inertial Fusion Sciences and Applications (IFSA 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of keV X-ray emitted from laser produced Au plasmas by using a crystal spectrometer2019

    • Author(s)
      Morishita Takehiro , Matsumoto Yasuhiro , CHRISTIAN JOHN , Kishimoto Maki , Johzaki Tomoyuki, Ejima Takeo , Sunahara Atsushi , Endo Takuma , Higashiguchi Takeshi , Namba Shinichi
    • Organizer
      DPP19 Meeting of The American Physical Society
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Characteristics of soft x-ray emissions from Au plasmas generated with various driving laser pulse durations2019

    • Author(s)
      Matsumoto Yasuhiro , Christian John , Morishita Takehiro , Kishimoto Maki , Namba Shinichi
    • Organizer
      DPP19 Meeting of The American Physical Society
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] レーザー生成金プラズマの生成と流体シミュレーションの比較2019

    • Author(s)
      森下岳大 , Christian John , 松本康寛 , 岸本 牧 , 城﨑友至 , 砂原 淳 , 難波 愼一
    • Organizer
      核融合研NIFS共同研究「プラズマ分光計測と原子分子素過程研究の融合最前線」研究会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Anomalous enhancement of water window X-rays emitted from laser produced Au plasma under low-pressure nitrogen atmosphere2018

    • Author(s)
      S.Namba, M. Kishimoto, C.John, N. Kakunaka, Y. Matsumoto, N. Hasergawa, M. Nishikino, T. Higashiguchi, T. Ejima, A. Sunahara, T. Johzaki
    • Organizer
      2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2018), Division of Plasma Physics, Association of Asia Pacific Physics Society
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Fully coherent plasma x-ray laser by injection of a parametrically amplified high-order harmonic beam2018

    • Author(s)
      S. Namba, D. T. Hung, N. Hasegawa, M. Kishimoto, M. Nishikino, J. Seres, C. Serrat
    • Organizer
      60th Annual Meeting of the APS Division of Plasma Physics, American Physical Society
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Observation of enhancement in water window laser plasma X-ray under nitrogen atmosphere2018

    • Author(s)
      Y. Matsumoto, C. John, N. Kakunaka, T. Moroshita, J. Yu Jin, M. Kishimoto, S. Namba
    • Organizer
      60th Annual Meeting of the APS Division of Plasma Physics, American Physical Society
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Li-like Aluminum plasma soft x-ray laser by means of recombination scheme2018

    • Author(s)
      S. Namba, N. Kubo, M. Kishimoto, C. John, N. Hasegawa, M. Nishikino
    • Organizer
      16th International Conference on X^Ray Lasers (ICXRL2018), The Czech Academy of Sciences
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Observation of water-window soft X-ray emitted from laser plasmas generated in N2 gas atmospheres2018

    • Author(s)
      C. John, N. Kakunaka, Y. Matsumoto, M. Kishimoto, S. Namba
    • Organizer
      2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2018), Division of Plasma Physics, Association of Asia Pacific Physical Societies
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Water window soft X-ray emission from Au plasmas generated with a picosecond laser pulse2018

    • Author(s)
      N. Kakunaka, C. John, M. Kishimoto, Y. Matsumoto, N. Hasegawa, M. Nishikino, T. Higashiguch, T. Ejima, A. Sunahara, F. Nakajima, T. Johzaki, T. Endo, S. Namba
    • Organizer
      2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2018), Division of Plasma Physics, Association of Asia Pacific Physical Societies
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高気圧窒素雰囲気下でのレーザープラズマ軟X線の増幅効果2018

    • Author(s)
      角中 昇、小田切 誠、松本康寛、岸本 牧、難波 愼一
    • Organizer
      レーザー学会学術講演会 第38回年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] ガス雰囲気中でのレーザー励起プラズマ軟X線の高出力化2017

    • Author(s)
      小田切 誠、角中 昇、松本康弘、岸本 牧、難波愼一
    • Organizer
      Plasma Conference 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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