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RIKEN SPring-8 Center Accelerator Development Team

Team Leader: Takahiro Inagaki (D.Sci.)

Research Summary

Takahiro  Inagaki(D.Sci.)

The team conducts R&D on accelerator components, such as an RF acceleration system, beam-diagnostics, an RF timing system for achieving ultimate performance of SASE FEL.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Engineering
  • Quantum beam science
  • Electrical and electronics engineering
  • Physics


  • XFEL
  • accelerator
  • microwave
  • beam monitor
  • High engineering

Selected Publications

  • 1. H. Maesaka, H. Ego, S. Inoue, S. Matsubara, T. Ohshima, T. Shintake and Y. Otake.:
    "Sub-micron resolution rf cavity beam position monitor system at the SACLA facility"
    Nuclear Instruments and Methods., A 696, 66-74 (2012).
  • 2. Y. Otake, T. Ohshima, N.Hosoda, H. Maesaka, T. Fukui, M. Kitamura and T. Shintake.:
    "LLRF and timing system for the SCSS test accelerator at SPring-8"
    Nuclear Instruments and Methods A 696, 151-163 (2012).
  • 3. Y. Otake, H. Maesaka, S. Matsubara, S. Inoue, K. Yanagida, H. Ego, C. Kondo, T. Sakurai, T. Matsumoto and H. Tomizawa.:
    "Beam monitor system for an x-ray free electron laser and compact laser"
    Phys. Rev. ST Accel. Beams 16, 042802 (2013).
  • 4. T. Inagaki, C. Kondo, H. Maesaka, T. Ohshima, Y. Otake, T. Sakurai, K. Shirasawa and T. Shintake.:
    "High-gradient C-band Linac for a Compact x-ray free-electron laser facility"
    Phys. Rev. ST Accel. Beams 17, 080702 (2014).
  • 5. H. Ego, H. Maesaka, T. Sakurai, Y Otake, T. Hashirano and S. Miura.:
    "Tanasvers C-band deflecting structure for longitudinal electro-bunch-diagnosis in XFEL "SACLA""
    Nuclear Instruments and Methods A 795, 381-388 (2015).
  • 6. Y. Otake, H. Maesaka, S. Matsubara and N.Hosoda and T. Ohshima.:
    "Timing and low-level rf system for an x-ray laser"
    Phys. Rev. Accel. Beams 19, 02001-1 -20 (2016).
  • 7. T. Ohshima, H. Maesaka, S. Matsubara and Y. Otake.:
    "Error compensation of IQ modulator using two-dimensional DFT"
    Nuclear Instruments and Method., A 820 (2016) 65-74.
  • 8. T. Sakurai, H. Ego, T. Inagaki, T. Asaka, D. Suzuki, S. Miura and Y. Otake.:
    "C-band disk-loaded-type accelerating structure for a high acceleration gradient and high-repetition-rate operation",
    Phys. Rev. Accel. Beams 20, 042003 (2017).
  • 9. T. Asaka, H. Ego, H. Hanaki, T. Hara, T. Hasegawa, T. Hasegawa, T. Inagaki, T. Kobyashi, C. Kondo, H. Maesaka, S. Matsubara, S. Matsui, T. Ohshima, Y. Otake, T. Sakurai, S. Suzuki, Y. Tajiri, S. Tanaka, K. Togawa and H. Taknaka.:
    "Low-emittance thermionic-gun based injector for a compact free-electron laser"
    Phys. Rev. Accel. Beams 20, 080702 (2017)
  • 10. T. Asaka, T. Inagaki, T. Magome, N. Nishimori, Y. Otake, T. Taniuchi, K, Yanagida, and H. Tanaka.:
    "Low-emittance radio-frequency electron gun using a gridded thermionic cathode"
    Phys. Rev. Accel. Beams 23, 063401 (2020)

Lab Members

Principal investigator

Takahiro Inagaki
Team Leader

Core members

Kazuaki Togawa
Senior Research Scientist
Hirokazu Maesaka
Senior Research Scientist

Contact Information

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