高強度場科学研究G

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高強度場科学研究グループ

グループリーダー　神門　正城

研究の概要

世界トップクラスの高強度レーザーであるJ-KAREN-Pレーザーなどの技術開発を基盤として、電子やイオンのレーザー加速開発を含む高強度物理など学術の最先端を目指した研究を行っています。

高強度場科学とは？

​レーザー光は小さく絞ることができます。カメラのフラッシュのように短い時間だけ光るレーザーをパルスレーザーと呼び、瞬間的な光の強さはさらに大きくなります。図1には、集光強度と電場を表し、そこで展開される研究テーマ（の一部）を示しました。主にレーザーを用いた粒子加速（量子ビーム生成）を行っていますが、高強度場では究極的には真空を歪めたり（真空の複屈折）、真空を壊したり（真空破壊）を目指して新しい領域を開拓しようとしています。このような強度では、宇宙の謎や、物理学の基礎的な問題の解決にアプローチできると信じています。

メンバー

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主な研究内容

1. レーザー駆動量子ビーム源の研究
   　高出力・極短パルスレーザーを小さく集光することで高強度場を作り、高エネルギーのイオン、電子、X線などの量子ビーム源の生成高度化の研究を行っています。イオン加速では、「量子メス」という新しい概念のもと、がん治療用重粒子線加速器を小型化する研究、先端科学に用いる重粒子イオンの加速法や計測器の開発を進めています。
   　電子加速では、小型のX線自由電子レーザーやガンマ線源などの量子ビーム生成のための研究を行なっています。　
    コヒーレント・アト秒・X線パルス生成を目指して、Burst Intensification by Singularity Emitting Radiation (BISER)という新しい放射機構の研究や、相対論的飛翔鏡（Relativistic Flying Mirror）も研究しています。
     
2. 高強度レーザーによる新しい科学分野「超高強度場科学」の開拓
   　高強度レーザー（J-KAREN）により10²² W/cm²という高い強度が実現されています。このような高い強度やそれ以上の強度で起こる現象について理論的、数値的、実験で迫る研究を進めています。
   　​私たちのグループでは、放射減衰効果に着目して、大強度・短パルスのガンマ線（X線）の放射を理論・数値的に示しました。今では高強度場科学の大きなテーマの一つに成長し、世界中で研究されています。
3. 世界トップクラスの高強度レーザー（J-KAREN-P）の改良・高度化
   　先端レーザー科学研究グループと共同で、世界トップクラスの高強度レーザーの改良・高度化の研究開発を行っています。30Jのレーザーエネルギーを30フェムト秒（1フェムトは1000兆分の1）の時間に閉じ込めることにより1000兆ワットの超高強度を実現できます。（写真は、強力な励起レーザーの光で緑色に光っています。）

   

研究トピックス

・相対論的飛翔鏡の研究

業績リスト（論文、受賞、プレス発表等）

1. 論文［査読付き論文］

2023

• Controllable electron self-injection in laser wakefield acceleration with symmetric gas-jet profile
  Zhenzhe Lei,  Zhan Jin,  Alexei Zhidkov,  Naveen Pathak,  Yoshio Mizuta,  Kai Huang, Nobuhiki Nakanii,  Izuru Daito,  Masaki Kando,  Tomonao Hosokai
  Progress of Theoretical and Experimental Physics, 2023 (3), 033J01 (2023).
  https://doi.org/10.35848/1882-0786/ac5237

• Precise pointing control of high-energy electron beam from laser wakefield acceleration using an aperture
  Nobuhiko Nakanii, Kai Huang, Kotaro Kondo, Hiromitsu Kiriyama and Masaki Kando
  Appl. Phys. Express 16, 026001 (2023).
  https://doi.org/10.35848/1882-0786/acb892
• Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities
  Nicholas P. Dover, Tim Ziegler, Stefan Assenbaum, Constantin Bernert, Stefan Bock, Florian-Emanuel Brack, Thomas E. Cowan, Emma J. Ditter, Marco Garten, Lennart Gaus, Ilja Goethel, George S. Hicks, Hiromitsu Kiriyama, Thomas Kluge, James K. Koga, Akira Kon, Kotaro Kondo, Stephan Kraft, Florian Kroll, Hazel F. Lowe, Josefine Metzkes-Ng, Tatsuhiko Miyatake, Zulfikar Najmudin, Thomas Püschel, Martin Rehwald, Marvin Reimold, Hironao Sakaki, Hans-Peter Schlenvoigt, Keiichiro Shiokawa, Marvin E. P. Umlandt, Ulrich Schramm, Karl Zeil & Mamiko Nishiuchi
  Light: Science & Applications 12, 71 (2023).
  https://doi.org/10.1038/s41377-023-01083-9

• Spectral-temporal measurement capabilities of third-order correlators
  Stefan Bock, Thomas Oksenhendler, Thomas Püschel, René Gebhardt, Uwe Helbig, Richard Pausch, Tim Ziegler, Constantin Bernert, Karl Zeil, Arie Irman, Toma Toncian, Hiromitsu Kiriyama, Mamiko Nishiuchi, Akira Kon, and Ulrich Schramm
  Optics Express, 31 (6), 9923-9934 (2023). 
  https://doi.org/10.1364/OE.475575

2022

• Experimental demonstration of 7-femtosecond electron timing fluctuation in laser wakefield acceleration
  Kai Huang, Zhan Jin, Nobuhiko Nakanii, Tomonao Hosokai, Masaki Kando
  Appl. Phys. Exp. 15, 036001 (2022).
  https://doi.org/10.35848/1882-0786/ac5237
• Prospects of Relativistic Flying Mirrors for Ultra-High-Field Science
  Masaki Kando, Alexander S. Pirozhkov, James K. Koga, Timur Zh. Esirkepov and Sergei V. Bulanov
  Photonics 9, 862 (2022) [Review].
  https://doi.org/10.3390/photonics9110862
• Characteristics of laminar ion beams accelerated via a few-joule laser pulse
  Toshimasa Morita
  Phys. Review Research 4, 043020 (2022).
  https://doi.org/10.1103/PhysRevResearch.4.043020
• Enhanced diagnostics of radiating relativistic singularities and BISER by nonlinear post-compression of optical probe pulse
  A.V. Kotov, T.Zh. Esirkepov, A.A. Soloviev, A. Sagisaka, K. Ogura, A. Bierwage, M. Kando, H. Kiriyama, M.V. Starodubtsev, E.A. Khazanov, S.Yu. Mironov and A.S. Pirozhkov
  Journal of Instrumentation 17, P07035 (2022).
  https://doi.org/10.1088/1748-0221/17/07/P07035
• Nanoscale subsurface dynamics of solids upon high-intensity femtosecond laser irradiation observed by grazing-incidence x-ray scattering
  Lisa Randolph, Mohammadreza Banjafar, Thomas R. Preston, Toshinori Yabuuchi, Mikako Makita, Nicholas P. Dover, Christian Rödel , Sebastian Göde, Yuichi Inubushi, Gerhard Jakob, Johannes Kaa, Akira Kon, James K. Koga, Dmitriy Ksenzov, Takeshi Matsuoka, Mamiko Nishiuchi, Michael Paulus, Frederic Schon, Keiichi Sueda, Yasuhiko Sentoku, Tadashi Togashi, Michael Bussmann, Thomas E. Cowan, Mathias Kläui, Carsten Fortmann-Grote, Lingen Huang, Adrian P. Mancuso, Thomas Kluge, Christian Gutt, and Motoaki Nakatsutsumi
  Phys. Rev. Res. 4, 033038 (2022).
  https://doi.org/10.1103/PhysRevResearch.4.033038
• Characterization of the plasma mirror system at the J-KAREN-P facility
  Akira Kon, Mamiko Nishiuchi, Yuji Fukuda, Kotaro Kondo, Koichi Ogura, Akito Sagisaka, Yasuhiro Miyasaka, Nicholas P. Dover, Masaki Kando, Alexander S. Pirozhkov, Izuru Daito, Liu Chang, Il Woo Choi, Chang Hee Nam, Tim Ziegler, Hans-Peter Schlenvoigt, Karl Zeil, Ulrich Schramm, and Hiromitsu Kiriyama
  High Power Laser Science and Engineering, 10, e25 (2022).
  https://doi.org/10.1017/hpl.2022.15
• Construction of a Magnetic Bottle Electron Spectrometer for Electron Energy Measurement in BISER X-Rays and Xe Interaction
  Hikari OHIRO, Alexander S. PIROZHKOV, Koichi OGURA, Akito SAGISAKA, Tatiana A. PIKUZ, Kai HUANG, Masaki KANDO, Kotaro YAMASAKI and Shinichi NAMBA
  Plasma and Fusion Research, 17, 2406020 (2022).
  https://doi.org/10.1585/pfr.17.2406020
• Facilities in Asia for future accelerator development
  M. Kando, T. Hosokai, K. Y. Kim, and C. Tang
  Journal of Instrumentation, 17 T06001 (2022) [Technical Report]
  https://doi.org/10.1088/1748-0221/17/06/T06001

2021

• Relativistic flying laser focus by a laser-produced parabolic plasma mirror
  Tae Moon Jeong, Sergei V. Bulanov, Petr Valenta, Georg Korn, Timur Zh. Esirkepov, James K. Koga, Alexander S. Pirozhkov, Masaki Kando, and Stepan S. Bulanov
  Phys. Rev. A 104, 053533 (2021). https://doi.org/10.1103/PhysRevA.104.053533
• Gamma factory searches for extremely weakly interacting particles​s
  Sreemanti Chakraborti, Jonathan L. Feng, James K. Koga, and Mauro Valli, 
  Phys. Rev. D 104, 055023 (2021). https://doi.org/10.1103/PhysRevD.104.055023
• Denoising application for electron spectrometer in laser-driven ion acceleration using a Simulation-supervised Learning based CDAE 
  Tatsuhiko Miyatake, Keiichiro Shiokawa, Hironao Sakaki, Nicholas P. Dover, Mamiko Nishiuchi, Hazel F. Lowe, Kotaro Kondo, Akira Kon, Masaki Kando, Kiminori Kondob, Yukinobu Watanabe
  Nucl. Instru. Meth. A 999, 165227 (2021). https://doi.org/10.1016/j.nima.2021.165227
• Proton beam quality enhancement by spectral phase control of a PW-class laser system 
  T. Ziegler, D. Albach, C. Bernert, S. Bock, F.-E. Brack, T. E. Cowan, N. P. Dover, M. Garten, L. Gaus, R. Gebhardt, I. Goethel, U. Helbig, A. Irman, H. Kiriyama, T. Kluge, A. Kon, S. Kraft, F. Kroll, M. Koeser, J. Metzkes-Ng, M. Nishiuchi, L. Obst-Huebl, T. Püschel, M. Rehwald, H.-P. Schlenvoigt, U. Schramm, & K. Zeil
  Scientific Reports 11, 7338 (2021). https://www.nature.com/articles/s41598-021-86547-x

   2020

• Characterization of Accumulated B-Integral of Regenerative Amplifier Based CPA Systems
  S. Bock, F. M. Herrmann, T. Püschel, U. Helbig, R. Gebhardt, J. J. Lötfering, R. Pausch, K. Zeil, T. Ziegler, A. Irman, T. Oksenhendler, A. Kon, M. Nishuishi, H. Kiriyama, K. Kondo, T. Toncian, and U. Schramm, Crystals 10, 1 (2020)
  https://doi.org/10.3390/cryst10090847
• Relativistic Flying Forcibly Oscillating Reflective Diffraction Grating
  Jie Mu, T. Zh. Esirkepov, Petr Valenta, Yanjun Gu, Tae Moon Jeong, Alexander S. Pirozhkov, James K. Koga, Masaki Kando, Georg Korn, and Sergei V. Bulanov, Phys. Rev. E, 102, 053202 (2020). https://doi.org/10.1103/PhysRevE.102.053202
• Electron-Positron Pair Creation in the Electric Fields Generated by Micro-bubble Implosions 
  James K. Koga, Masakatsu Murakami, Alexey V. Arefiev, Yoshihide Nakamiya, Stepan S. Bulanov, Sergei V. Bulanov, Physics Letters A　384, 126854 (2020). 
  https://doi.org/10.1016/j.physleta.2020.126854
• Ion species discrimination method by linear energy transfer measurement in Fujifilm BAS-SR Imaging Plate
  M. Nishiuchi, H. Sakaki, N. P. Dover, T. Miyahara, K. Shiokawa, S. Manabe, T. Miyatake, Ko. Kondo, Ke. Kondo, Y. Iwata, Y. Watanabe, and Ki. Kondo , Rev. Sci. Instru. 91, 093305 (2020). 
  https://doi.org/10.1063/5.0016515
• High intensity laser driven oxygen source from CW laser heated Ti tape targets
  Kotaro Kondo, Mamiko Nishiuchi, Hironao Sakaki, Nicholas P. Dover, Hazel F. Lowe, Takumi Miyahara, Yukinobu Watanabe, Tim Ziegler, Karl Zeil, Ulrich Schramm, Emma J. Ditter, George S. Hicks, Oliver C. Ettlinger, Zulfikar Najmudin, Hiromitsu Kiriyama, Masaki Kando and Kiminori Kondo, Crystals 10, 837 (2020). 
  https://doi.org/10.3390/cryst10090837
• Topological investigation of laser ion acceleration
  T. Morita, Plasma Phys. Control. Fusion 62, 105003 (2020).
  https://dx.doi.org/10.1088/1361-6587/aba766
• New algorithm using L1 regularization for measuring electron energy spectra
  Hironao Sakaki, Tomohiro Yamashita, Takashi Akagi, Mamiko Nishiuchi, Nicholas P. Dover, Hazel F. Lowe, Kotaro Kondo, Akira Kon, Masaki Kando, Yasuhiko Tachibana, Takayuki Obata, Keiichiro Shiokawa, Tatsuhiko Miyatake, and Yukinobu Watanabe, Review of Scientific Instruments 91, 075116 (2020).
  https://doi.org/10.1063/1.5144897
• Single-shot electro-optic sampling on the temporal structure of laser wakefield accelerated electrons
  Kai Huang, Hideyuki Kotaki, Michiaki Mori, Yukio Hayashi, Nobuhiko Nakanii and Masaki Kando, Crystals 2020, 10(8), 640 (2020).
  https://doi.org/10.3390/cryst10080640
• Single-shot measurement of post-pulse-generated pre-pulse
  Akira Kon, Mamiko Nishiuchi, Hiromitsu Kiriyama, Masaki Kando, Stefan Bock, Tim Ziegler, Thomas Pueschel, Karl Zeil, Ulrich Schramm and Kiminori Kondo, Crystals, 10(8), 657 (2020).
  https://doi.org/10.3390/cryst10080657
• Dynamics of laser-driven heavy-ion acceleration clarified by ion charge states
  M. Nishiuchi, N. P. Dover, M. Hata, H. Sakaki, Ko. Kondo, H. F. Lowe, T. Miyahara, H. Kiriyama, J. K. Koga, N. Iwata, M. A. Alkhimova, A. S. Pirozhkov, A. Ya. Faenov, T. A. Pikuz, A. Sagisaka, Y. Watanabe, M. Kando, K. Kondo, E. J. Ditter, O. C. Ettlinger, G. S. Hicks, Z. Najmudin, T. Ziegler, K. Zeil, U. Schramm and Y. Sentoku, Phys. Rev. Research 2, 033081 (2020).
  https://doi.org/10.1103/PhysRevResearch.2.033081
• Status and progress of the J-KAREN-P high intensity laser system at QST
  Hiromitsu Kiriyama, Alexander, S. Pirozhkov, Mamiko Nishiuchi, Yuji Fukuda, Koichi Ogura, Akito Sagisaka, Yasuhiro Miyasaka, Hironao Sakaki, Nicholas P. Dover, Kotaro Kondo, Hazel F. Lowe, Akira Kon, James K. Koga, Timur Zh. Esirkepov, Nobuhiko Nakanii, Kai Huang, Masaki Kando, Kiminori Kondo, High Energy Density Physics 36, 100771 (2020). https://doi.org/10.1016/j.hedp.2020.100771 
• Observation of Burst Intensification by Singularity Emitting Radiation generated from relativistic plasma with a high-intensity laser
  A. Sagisaka, K. Ogura, T. Zh. Esirkepov, D. Neely, T. A. Pikuz, J. K. Koga, Y. Fukuda, H. Kotaki, Y. Hayashi, B. Gonzalez-Izquierdo, K. Huang, S. V. Bulanov, H. Kiriyama, K. Kondo, T. Kawachi, M. Kando, A. S. Pirozhkov, High Energy Density Physics, 36, 100751 (2020). https://doi.org/10.1016/j.hedp.2020.100751
• Light scattering by 4π-spherically-focused ultra-strong light field
  Tae Moon Jeong, Sergey Bulanov, Pavel V. Sasorov, Georg Korn, James Kevin Koga, Stepan S. Bulanov, Phys. Rev. A 28 (9), pp. 13991–14006 (2020).https://doi.org/10.1364/OE.387654
• Recoil effects on reflection from relativistic mirrors in laser plasmas
  P. Valenta, T. Zh. Esirkepov, J. K. Koga, A. S. Pirozhkov, M. Kando, T. Kawachi, Y.-K. Liu, P. Fang, P. Chen, J. Mu, G. Korn, O. Klimo, and S. V. Bulanov, Physics of Plasmas 27, 032109 (2020). https://doi.org/10.1063/1.5142084
• Optical probing of relativistic plasma singularities
  Timur Zh. Esirkepov, Jie Mu, Yanjun Gu, Tae Moon Jeong, Petr Valenta, Ondrej Klimo, James K. Koga, Masaki Kando, David Neely, Georg Korn, Sergei V. Bulanov, and Alexander S. Pirozhkov, Physics of Plasmas 27, 052103 (2020). https://doi.org/10.1063/5.0004525
• Characterization of ionization injection in gas mixtures irradiated by subpetawatt class laser pulses
  A. Zhidkov, N. Pathak, J. K. Koga, K. Huang, M. Kando, and T. Hosokai, Phys. Rev. Research 2, 013216 (2020). https://doi.org/10.1103/PhysRevResearch.2.013216
• Effect of Small Focus on Electron Heating and Proton Acceleration in Ultrarelativistic Laser-Solid Interactions
  N. P. Dover, M. Nishiuchi, H. Sakaki, Ko. Kondo, M. A. Alkhimova, A. Ya. Faenov, M. Hata, N. Iwata, H. Kiriyama, J. K. Koga, T. Miyahara, T. A. Pikuz, A. S. Pirozhkov, A. Sagisaka, Y. Sentoku, Y. Watanabe, M. Kando, and K. Kondo, Phys. Rev. Lett. 124, 084802 (2020). https://doi.org/10.1103/PhysRevLett.124.084802

   2019年

• Variation in electron emission time in weakly nonlinear laser wakefield acceleration
  K. Huang, H. Kotaki, M. Mori, T. Esirkepov, J. K. Koga, Y. Hayashi, N. Nakanii, S. V. Bulanov, and M. Kando, Phys. Rev. Accel. Beams 22, 121301 (2019). https://doi.org/10.1103/PhysRevAccelBeams.22.121301
• Multiple colliding laser pulses as a basis for studying high-field high-energy physics
  J. Magnusson, A. Gonoskov, M. Marklund, T. Zh. Esirkepov, J. K. Koga, K. Kondo, M. Kando, S. V. Bulanov, G. Korn, C. G. R. Geddes, C. B. Schroeder, E. Esarey, and S. S. Bulanov, Phys. Rev. A 100, 063404 (2019). https://doi.org/10.1103/PhysRevA.100.063404
• The Utility of Applying Various Image Preprocessing Strategies to Reduce the Ambiguity in Deep Learning-based Clinical Image Diagnosis
  Yasuhiko Tachibana, Takayuki Obata, Jeff Kershaw, Hironao Sakaki, Takuya Urushihata, Tokuhiko Omatsu, Riwa Kishimoto, Tatsuya Higashi, Magnetic Resonance in Medical Sciences (2019). https://doi.org/10.2463/mrms.mp.2019-0021
• Probing and possible application of the QED vacuum with micro-bubble implosions induced by ultra-intense laser pulses
  James K. Koga, Masakatsu Murakami, Alexey V. Arefiev, Yoshihide Nakamiya, ", Matter and Radiation at Extremes, 4 (3), 034401 (2019).  https://aip.scitation.org/doi/10.1063/1.5086933
• Relativistic proton emission from ultrahigh-energy-density nanosphere generated by microbubble implosion
  M. Murakami, A. V. Arefiev, M. A. Zosa, J. K. Koga, Y. Nakamiya, Physics of Plasmas 26, 043112 (2019). https://doi.org/10.1063/1.5093043

   2018年

• High-contrast high-intensity repetitive petawatt laser
  Hiromitsu Kiriyama, Alexander S. Pirozhkov, Mamiko Nishiuchi, Yuji Fukuda, Koichi Ogura, Akito Sagisaka, Yasuhiro Miyasaka, Michiaki Mori, Hironao Sakaki, Nicholas P. Dover, Kotaro Kondo, James K. Koga, Timur Zh. Esirkepov, Masaki Kando, and Kiminori Kondo, Optics Letters 43 (11), pp. 2595-2598 (2018). https://doi.org/10.1364/OL.43.002595
• Relativistically upshifted higher harmonic generation via relativistic flying mirrors
  James. K Koga, Sergei V. Bulanov, Timur Zh. Esirkepov, Masaki Kando, Stepan S. Bulanov and Alexander S. Pirozhkov,  Plasma Physics and Controlled Fusion 60 (7), 074007 (2018). https://doi.org/10.1088/1361-6587/aac068
  Corrigendum: Relativistically upshifted higher harmonic generation via relativistic flying mirrors (2018 Plasma Phys. Control. Fusion 60 074007)
  https://doi.org/10.1088/1361-6587/aad012
• Coherent, Short-Pulse X-ray Generation via Relativistic Flying Mirrors
  Masaki Kando, Timur Zh. Esirkepov, James K. Koga, Alexander S. Pirozhkov and Sergei V. Bulanov, Quantum Beam Science 2 (2), 9 (2018) [Review]; https://doi.org/10.3390/qubs2020009
• On annihilation of the relativistic electron vortex pair in collisionless plasmas
  K. V. Lezhnin, F. F. Kamenets, T. Zh. Esirkepov and S. V. Bulanov, Journal of Plasma Physics 84 (6), 905840610 (2018); https://doi.org/10.1017/S0022377818001162

   2017年

• Possible Precise Measurement of Delbrück Scattering Using Polarized Photon Beams
  James K. Koga and Takehito Hayakawa, Phys. Rev. Lett. 118, 204801 (2017). https://doi.org/10.1103/PhysRevLett.118.204801
• High resolution X-ray spectra of stainless steel foils irradiated by femtosecond laser pulses with ultra-relativistic intensities
  M. A. Alkhimova, A. Ya. Faenov, I. Yu. Skobelev, T. A. Pikuz, M. Nishiuchi, H. Sakaki, A. S. Pirozhkov, A. Sagisaka, N. P. Dover, Ko. Kondo, K. Ogura, Y. Fukuda, H. Kiriyama, K. Nishitani, T. Miyahara, Y. Watanabe, S. A. Pikuz, M. Kando, R. Kodama, and K. Kondo, Optics Express 25 (23), pp. 29501-29511 (2017); https://doi.org/10.1364/OE.25.029501

2. プレス発表

• 2020年7月16日 「高強度のレーザー光による世界最大の電場発生を実証　― 重イオン加速器の飛躍的な小型化に期待 ―」
• 2020年2月27日 「世界最高級強度のレーザー光が引き起こす電子の特異な振る舞いを解明！― 量子メスの実現に向けた重要な知見 ―」
• 2019年1月9日　「宇宙線発生の仕組みを利用した新たな加速器を提案-レーザー駆動の衝撃波を利用して光速に近い陽子線を発生できることを発見-」
• 2017年12月22日 「プラズマの特異点からの強力な軟X線バーストを発見－宇宙でも起こり得る普遍的な新しい放射機構の提案－」
• 2017年5月15日　「光子と光子の相互作用の検証方法を提案-量子電磁力学が20世紀に予測した現象の理解が期待される-」

共同研究

• 大阪大学産業科学研究所
• 大阪大学レーザー科学研究所
• Helmholtz Zentrum Dresden Rossendorf (HZDR), Germany
• ELI Beamlines, Czech Republic
• ELI Nuclear Physics, Romania

外部資金

• ​未来社会創造事業（2017年~現在）