Masahiro Okamura

1995-2006   Postdoc & Researcher, RIKEN
1995-2006   Visiting Scientist, BNL
2006–Present Physicist, BNL
2018-              Specially Appointed Professor, Institute of
                       Innovative Research, Tokyo Institute of

Field of Specialization
Accelerator Physics(Ion sources and linear accelerators)

Laboratory for Advanced Nuclear Energy(IIR, Tokyo Tech)
Brookhaven National Laboratory(U.S.A.)

Research Hub Group: Social Implementation international hub group

Research Highlights

  • Development of Siberian Snake magnets for polarized proton beam acceleration.
  • Invention of direct plasma injection scheme.
  • World record of the most intense heavy ion beam through RFQ linac.
  • Development of laser ion source for multiple species.


  • Jan. 2008
    Snake-spin (RIKEN)
  • Jul. 2014
    New Laser Ion Source for Brookhaven Accelerators Exceeds Expectations (BNL)

Selected Award

  • Brightness award; Gold (ICIS) (2011)
  • Science & Technology Award (BNL) (2016)

Selected Publications

  • Laser ion source for heavy ion inertial fusion, M. Okamura, Material and Radiation at Extremes 3, 61-66 (2018)
  • Measurement of magnetic field fluctuations and diamagnetic currents within a laser ablation plasma interacting with an axial magnetic field, S. Ikeda, K. Horioka, M. Okamura, Journal of Applied Physics 122, 143303 (2017)
  • Laser ion source for high brightness heavy ion beam, M. Okamura, Journal of Instrumentation 11 C09004 (2016)
  • Laser ion source with solenoid field, T. Kanesue, Y. Fuwa, K. Kondo, M. Okamura, Applied Physics Letters 105, 193506 (2014).
  • Overcoming Depolarizing Resonances with Dual Helical Partial Siberian Snakes, H. Huang, L. Ahrens, M. Bai, K. Brown, E.D. Courant, C. Gardner, J.W. Glenn, F. Lin, A.U. Luccio, W.W. MacKay, M. Okamura, V. Ptitsyn, T. Roser, J. Takano, S. Tepikian, N. Tsoupas, A. Zelenski and K. Zeno, Physical Review Letters 99, 154801 (2007).