X-ray amplification using high-intense optical laser

• Project/Area Number: 15H05434
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Quantum beam science
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Inubushi Yuichi 公益財団法人高輝度光科学研究センター, XFEL利用研究推進室, 主幹研究員 (40506250)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000); Fiscal Year 2017: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2016: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2015: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
• Keywords: XFEL / レーザー / プラズマ / X線分光 / 量子ビーム / X線自由電子レーザー

Outline of Final Research Achievements

Recent advent of X-ray Free Electron Lasers (XFELs) has opened the frontiers of various fields of science. However, a current output power of XFELs is still insufficient for conducting challenging applications. If the external amplifier scheme were applicable in the X-ray range, one could directly enhance the power of XFEL pulses.
In this study, we demonstrated an amplification of XFEL using core-hole atoms generated with intense optical laser pulse. A Cu foil was used as a gain medium. Intense Ti:Sapphire laser pulses were used to generate fast electrons. A photon energy of XFEL pulses was tuned to be 8.05 keV, corresponding to the Cu-K1 line. To observe the amplification, we measured single-shot spectra of XFEL pulses through the Cu foil. Intense peak at 8.05 keV was observed, and we confirmed that the divergence of the intense signal is same as that of XFEL pulses. From these results, we conclude achievement of x-ray amplification.

Research Products

• [Journal Article] Measurement of the X-ray Spectrum of a Free Electron Laser with a Wide-Range High-Resolution Single-Shot Spectrometer (2017)
  • Author(s): Inubushi Yuichi、Inoue Ichiro、Kim Jangwoo、Nishihara Akihiko、Matsuyama Satoshi、Yumoto Hirokatsu、Koyama Takahisa、Tono Kensuke、Ohashi Haruhiko、Yamauchi Kazuto、Yabashi Makina
  • Journal Title: Applied Sciences Volume: 7 Issue: 6 Pages: 584-584
  • DOI: 10.3390/app7060584
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Current status and future perspectives of SACLA (2017)
  • Author(s): Y. Inubushi, K. Tono, T. Togashi, S. Owada, T. Yabuuchi, T. Katayama, A. Kon, I. Inoue, T. Osaka, M. Yabashi
  • Organizer: International Conference on X-ray Optics and Applications
  • Int'l Joint Research / Invited
• [Presentation] Amplification of x-ray free electron laser using core-hole atoms generated with intense optical laser pulse (2016)
  • Author(s): Y. Inubushi, K. Ogawa, I. Inoue, T. Yabuuchi, S. Owada, T. Togashi, K. Tono, H. Yoneda, M. Yabashi
  • Organizer: The 15th International Conference on X-Ray Lasers
  • Place of Presentation: 奈良春日野国際フォーラム（奈良県奈良市）
  • Year and Date: 2016-05-22
  • Int'l Joint Research / Invited
• [Presentation] X-ray amplification using intense optical laser pulse (2016)
  • Author(s): Y. Inubushi
  • Organizer: 7th Ringberg Workshop on Science with FELs
  • Place of Presentation: Ringberg, Germany
  • Year and Date: 2016-02-07
  • Int'l Joint Research / Invited
• [Presentation] Amplifier for x-ray free electron laser using intense optical laser (2015)
  • Author(s): Y. Inubushi, K. Ogawa, I. Inoue, T. Togashi, S. Owada, T. Kameshima, K. Tono, T. Katayama, H. Yoneda, and M. Yabashi
  • Organizer: International Workshop on Warm Dense Matter 2015
  • Place of Presentation: Kurashiki, Japan
  • Year and Date: 2015-06-07
  • Int'l Joint Research / Invited