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RIKEN SPring-8 Center FEL Physics Team

Team Leader: Takashi Tanaka (D.Eng.)

Research Summary

Takashi  Tanaka(D.Eng.)

FEL physics team is in charge of development of devices called undulators, which induce interaction between radiation and electron beam to realize x-ray lasing. In addition, theoretical research and new XFEL scheme are explored to futher upgrade the laser performance of SACLA.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Mathematical & Physical Sciences
  • Engineering


  • free electron laser
  • synchrotron radiation
  • undulator
  • simulation
  • permanent magnet

Selected Publications

  • 1.Y. Kida, R. Kinjo and T. Tanaka:
    "Synthesizing high-order harmonics to generate a sub-cycle pulse in free-electron lasers"
    Applied Physics Letters 109, 151107 (2016)
  • 2.T. Bizen et al.:
    "Radiation-induced magnetization reversal causing a large flux loss in undulator permanent magnets"
    Scientific Reports 6, 37937 (2016)
  • 3.T. Tanaka et al.:
    "Using irregularly spaced current peaks to generate an isolated attosecond X-ray pulse in free-electron lasers"
    Journal of Synchrotron Radiation 23, 1273 (2016)
  • 4.T. Tanaka:
    "Reducing the group velocity of coherent radiation for upconverting the single-cycle electron density modulation"
    Applied Physics Letters 108, 061106 (2016)
  • 5.T. Tanaka:
    "SIMPLEX: simulator and postprocessor for free-electron laser experiments"
    Journal of Synchrotron Radiation 22, 1319 (2015)
  • 6.T. Tanaka:
    "Proposal to generate an isolated monocycle X-ray pulse by counteracting the slippage effect in free-electron lasers"
    Physical Review. Letters 114, 044801 (2015)
  • 7.T. Hara, Y. Inubushi, T. Katayama, T. Sato, H. Tanaka, T. Tanaka et al.
    "Two-colour hard X-ray free-electron laser with wide tunability"
    Nature Comm., 4 (2013) 2919
  • 8.K. Tamasaku, M. Nagasono, H. Iwayama, E. Shigemasa, Y. Inubushi, T. Tanaka et al.
    "Double Core-Hole Creation by Sequential Attosecond Photoionization"
    Phys. Rev. Lett., 111 (2013) 043001
  • 9.T. Tanaka
    "Proposal for a Pulse-Compression Scheme in X-Ray Free-Electron Lasers to Generate a Multiterawatt, Attosecond X-Ray Pulse"
    Phys. Rev. Lett., 110 (2013) 084801
  • 10.H. Yumoto, H. Mimura, T. Koyama, S. Matsuyama, K. Tono, et al.
    "Focusing of X-ray free electron laser pulses with reflective optics"
    Nature Photon., 7 (2013) 43

Related Links

Lab Members

Principal investigator

Takashi Tanaka
Team Leader

Contact Information

1-1-1 Kouto, Sayo-cho
Sayo-gun, Hyogo
679-5148 Japan
Email: ztanaka [at] spring8.or.jp