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RIKEN SPring-8 Center Accelerator Hardware Development Group

Group Director: Takahiro Inagaki (D.Sc.)

Research Summary

Takahiro Inagaki

The Accelerator Hardware Development Group conducts research and development of the components consists of the electron accelerators and photon sources to maintain stable operation and improve the performance of SACLA and SPring-8. We promote the upgrade project, SPring-8-II, which will reduce the emittance of stored electron beams and increase the brightness of synchrotron radiation by nearly two orders of magnitude. In addition, we will conduct research and development of accelerator and light source components to realize the next-generation high-brilliance, high-repetition X-ray free-electron laser.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Mathematical & Physical Sciences
  • Engineering
  • Quantum beam physics
  • Electrical and electronic engineering


  • Accelerator
  • Beam physics
  • Synchrotron radiation
  • Free electron laser
  • Radio frequency

Selected Publications

  • 1. Hara T., Aoki T., Dewa H., Fujita T., Fukami K., Fukui T., Hiraiwa T., Hosoda N., Inagaki T., Itoga T., Iwai E., Kiyomichi A., Kondo C., Maesaka H., Masaki M., Matsubara S., Morimoto O., Ohshima T., Oishi M., Shoji M., Soutome K., Tajiri Y., Takano S., Tamura K., Taniuchi Y., Togawa K., Watanabe T., Yabuuchi T., and Tanaka H.:
    "Low-emittance beam injection for a synchrotron radiation source using an X-ray free-electron laser linear accelerator"
    Physical Review Accelerators and Beams 24, 110702 (2021)
  • 2. Kondo C., Hara T., Fukui T., Inagaki T., Takebe H., Nakazawa S., Fukami K., Kawaguchi Y., Kawaguchi H., Otake Y., and Tanaka H.:
    "A stable pulsed power supply for multi-beamline XFEL operations"
    Review of Science Instruments 89, 064704 (2018)
  • 3. Hara T., Kondo C., Inagaki T., Togawa K., Fukami K., Nakazawa S., Hasegawa T., Morimoto O., Yoshioka M., Maesaka H., Otake Y., and Tanaka H.:
    "High peak current operation of x-ray free-electron laser multiple beam lines by suppressing coherent synchrotron radiation effect"
    Physical Review Accelerators and Beams 21, 040701 (2018)
  • 4. Owada S., Togawa K., Inagaki T., Hara T., Tanaka T., Joti Y., Koyama T., Nakajima K., Ohashi H., Senba Y., Togashi T., Tono K., Yamaga M., Yumoto H., Yabashi M., Tanaka H., and Ishikawa T.:
    "A soft X-ray free-electron laser beamline at SACLA: the light source, photon beamline and experimental station”
    Journal of Synchrotron Radiation 25, 282-288 (2018)
  • 5. Asaka T., Ego H., Hanaki H., Hara T., Hasegawa T., Hasegawa T., Inagaki T., Kobayashi T., Kondo C., Maesaka H., Matsubara S., Matsui S., Ohshima T., Otake Y., Sakurai T., Suzuki S., Tajiri Y., Tanaka S., Togawa K., and Tanaka H.:
    "Low-emittance thermionic-gun-based injector for a compact free-electron laser"
    Physical Review Accelerators and Beams 20, 080702 (2017)
  • 6. Otake Y., Maesaka H., Matsubara S. Hosoda N. and Ohshima T.:
    "Timing and low-level rf system for an x-ray laser"
    Physical Review Accelerators and Beams 19, 022001 (2016)
  • 7. Ego H., Maesaka H., Sakurai T., Otake Y., Hashirano T. and Miura S.:
    "Transverse C-band deflecting structure for longitudinal electro-bunch-diagnosis in XFEL "SACLA""
    Nuclear Instruments and Methods A 795, 381-388 (2015)
  • 8. Inagaki T., Kondo C., Maesaka H., Ohshima T., Otake Y., Sakurai T., Shirasawa K. and Shintake T.:
    "High-gradient C-band Linac for a Compact x-ray free-electron laser facility"
    Physical Review Special Topics Accelerators and Beams 17, 080702 (2014)
  • 9. Otake Y., Maesaka H., Matsubara S., Inoue S., Yanagida K., Ego H., Kondo C., Sakurai T., Matsumoto T. and Tomizawa H.:
    "Beam monitor system for an x-ray free electron laser and compact laser"
    Physical Review Special Topics Accelerators and Beams 16, 042802 (2013)
  • 10. Maesaka H., Ego H., Inoue S., Matsubara S., Ohshima T., Shintake T. and OtakeY.:
    "Sub-micron resolution rf cavity beam position monitor system at the SACLA facility"
    Nuclear Instruments and Methods., A 696, 66-74 (2012)

Lab Members

Principal investigator

Takahiro Inagaki
Group Director


Position Deadline
Seeking a few Research Scientists or Postdoctoral Researchers (C23-0801) Open until filled

Contact Information

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


Accelerator Common Components Team
Takahiro Inagaki (D.Sc.)
Advanced Beam Diagnosis Team
Hirokazu Maesaka (D.Sc.)