1. Home
  2. Research
  3. Centers & Labs
  4. RIKEN SPring-8 Center
  5. Innovative Synchrotron Radiation Facility Division

RIKEN SPring-8 Center SPring-8 Upgrade Design Group

Group Director: Toru Hara (D.Sc.)

Research Summary

Toru Hara

The Group is committed to the upgrade of the accelerator based light sources, SPring-8 and SACLA, located in the SPring-8 campus. At SPring-8, we are engaged in the design and component development for a next-generation synchrotron radiation source that employs Multi-Bend Achromat (MBA). Our goal is to realize a high-brightness light source with emittance of below 100 pm-rad. At SACLA, we will develop technology that enables to increase a pulse repetition rate of a normal conducting linear accelerator by more than an order of magnitude. Our goal is not only to enhance the light source performance but also to achieve energy savings simultaneously.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Mathematical & Physical Sciences
  • Engineering
  • Quantum Beam Science
  • Computational Science
  • Applied Physics


  • Particle Accelerators
  • Beam Physics
  • Synchrotron Radiation
  • X-ray Free Electron Laser
  • SPring-8

Selected Publications

  • 1. Fukami K, Inagaki T, Iwashita T, Nakanishi H, Nishimori N, Takano S, Takemura Y, Taniuchi T, Watanabe T, Yamaguchi H, and Tanaka H.:
    "Iron lamination and interlaminar insulation for high-frequency pulsed magnets",
    Review of Scientific Instruments 93, 023301 (2022)
  • 2. Masaki M, Maesaka H, Soutome K, Takano S, Watanabe T, Kubota K, Fujita T, Dewa H, Fukui T, Sugimoto T, Takeuchi M and Tanaka H.:
    "Adaptive feedforward control of closed orbit distrtion caused by fast helicity-switching undulators",
    J. Synchrotron Rad. 28, 1758-1768 (2021).
  • 3. Hiraiwa T, Soutome K, and Tanaka H.:
    "Formulation of electron motion in a storage ring with a betatron tune varying with time and a dipole shaker working at a constant frequency",
    Physical Review Accelerators and Beams 24, 114001 (2021).
  • 4. Hiraiwa T, Soutome K, and Tanaka H.:
    "Forced harmonic oscillator interpred as diffraction of light",
    Physical Review E. 102, 032211 (2020).
  • 5. Watanabe T., Taniuchi T., Takano S., Aoki T., and Fukami K.:
    "Permanent magnet based dipole magnets for next generation light sources"
    Physical Review Accelerators and Beams, Accepted 7 July 2017.
  • 6. Soutome K. and Tanaka H.:
    "Higher-order formulas of amplitude-dependent tune shift caused by a sextupole magnetic field distribution"
    Physical Review Accelerators and Beams 20, 064001 (2017).
  • 7. Tanaka H., Goto S., Takano S., Tono K., Masaki M., and Yabashi M.:
    "Photon diagnostic system to fully utilize the performance of upgraded SPring-8"
    Journal of JSSRR Vol. 30, No.1/Jan., pp.28-38 (2017).
  • 8. Soutome K., Shimosaki Y., Takao M., and Tanaka H.:
    "Nonlinear lattice optimization for the SPring-8 upgrade"
    Proceedings of IPAC2017, Copenhagen, Denmark, pp.3091-3094 (2017).
  • 9. Soutome K., Kaneki K. K., Shimosaki Y., Takao M., and Tanaka H.:
    "Nonlinear optimization of storage ring lattice for the SPring-8 upgrade"
    Proceedings of IPAC2016, Busan, Korea, pp.3440-3442 (2016).
  • 10. Tanaka H., Ishikawa T., Goto S., Takano S., Watanabe T., and Yabashi M.:
    "SPring-8 upgrade project"
    Proceedings of IPAC2016, Busan, Korea, pp.2867-2870 (2016).

Recent Research Results


Related Links

Lab Members

Principal investigator

Toru Hara
Group Director

Core members

Sunao Takahashi
Senior Technical Scientist
Hirokazu Maesaka
Senior Research Scientist
Kouichi Soutome
Research Scientist
Toshihiko Hiraiwa
Research Scientist
Takahiro Inagaki
Research Scientist

Contact Information

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