1987-1991 Div. Laser & Millimeter-Wave Development, NEC Corp.
1991-1995 Assist. Prof. RLNR, Tokyo Tech.
1995-2016 Assoc. Prof. RLNR, Tokyo Tech.
2016- Assoc. Prof. LANE, IIR, Tokyo Tech

Field of Specialization
Plasma Science and Engineering / Plasma Electronics / Nuclear

Laboratory for Advanced Nuclear Energy(IIR, Tokyo Tech)


Research Hub Group:Social Implementation international hub group

Research Highlights

  • Finding of essentiality of collisional de-excitation of excited states of NO molecule by O2 ground state in N2-O2 gas mixture discharge plasma(Mar. 2016)
  • Finding of essentiality of collisions with neutral particles in supersonic acceleration and electric potential formation of expanding arc-jet plasma at open-field magnetic field(Jan. 2017)


  • Mar. 2017
    An invited talk at the Symposium of the72nd Annual Meeting of JPS, “Basic Experiments in an Expanding Arc-Jet and its Hybrid Simulation”.
  • Sept. 2015
    An invited tutorial talk at the 10th Asian-European International Conference on Plasma Surface Engineering (AEPSE2015), “Fundamentals for Processes-Plasma Diagnostics Using Optical Spectroscopy”.
  • Mar. 2015
    An invited tutorial talk at the 62nd JSAP Spring Meeting,”Fundamentals and Applications of Practical Measurement of Processing Plasmas by Optical Emission Spectroscopy, Ch. 1, “Fundamentals — Electron temperature, Density, Gas temperature and radical densities”

Selected Awards

  • 2002
    The 13th Technical Award, The Visualization Society of Japan

Selected Publications

  • Spectroscopic Measurement of Electron Temperature and Density in Argon Plasmas Based on Collisional Radiative Model; Plasma Sources Sci. Technol., 9, 314-322 (2000).
  • Spectroscopic Study on the Vibrational Populations of N2 C 3Π and B 3Π States in a Microwave Nitrogen Discharge; J. Appl. Phys., 101, [2], 023307 (7 pages) (2007).
  • Surface Treatment of TiO2 Films for Dye-Sensitized Solar Cells Using Atmospheric-Pressure Non-Equilibrium DC Pulse Discharge Plasma Jet; Vacuum, 83, 124-127 (2009).
  • Stationary Population Inversion of Hydrogen in an Arc-heated Magnetically Trapped Expanding Hydrogen-Helium Plasma Jet; Phys. Rev. E, 49, [2], 1534-1544, (1994).
  • Arc-heated Magnetically-trapped Expanding Plasma Jet Generator; Rev. Sci. Instrum., 64, [7], 1734-1739, (1993).