Kyushu University Academic Staff Educational and Research Activities Database
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KENTARO TOMITA Last modified date:2018.06.18

Graduate School

Academic Degree
Doctor of Engineering
Field of Specialization
Diagnostics of industrial plasmas
Research Interests
  • Collective Thomson Scattering diagnostics for collisionless shocks produced with high-power laser
    keyword : Collisionless shocks, Thomson scattering
  • Diagnostics of electron properties at plasma-nano interaction
    keyword : electron density, electron temperature
  • Laser Aided Diagnostics of Discharge plasmas for producing solar cells
    keyword : solar cells, negative ions, electron density, electron temperature
  • Studies of Arc discharges for Gas Circuit Breakers
    keyword : Gas Circuit Breakers , electron density, electron temperature, laser Thomson scattering
  • Development of an electron density and electron temperature measurement system for non-equilibrium discharge plasmas produced in atmospheric pressure
    keyword : electron density, electron temperature, laser Thomson scattering
  • Studies of Ion Engine Thruster using Laser Scattering Diagnostics
    keyword : laser Thomson scattering, ion engine, electron density, electron temperature
  • Develpment of Laser Thomson Scattering system for Plasmas produced for Extreme Ultra Violet Lithography
    keyword : collective Thomson scattering, Extreme Ultra Violet Lithography, electron density, electron temperature, ionic charge
Current and Past Project
  • This project tries to develop an excellent diagnostics tool of extreme ultra violet (EUV) light source plasmas, which is used as the light source of next generation lithography system. The main method of diagnostics is collective Thomson scattering. We try to measure fundamental parameters such as electron density and electron temperature of EUV light source plasmas with sufficient temporal and spatial resolutions.
Academic Activities
1. Kentaro Tomita, Daisuke Gojima, Takahiro Shimizu, Kiichiro Uchino, Tomoyuki Nakano, Yasunori Tanaka, Katsumi Suzuki, Takanori Iijima, Toshiyuki Uchii, and Takeshi Shinkai, Thomson scattering diagnostics of SF6 gas-blasted arcs confined by a nozzle under free-recovery conditions, J. Phys. D: Appl. Phys.,, 48 (2015) 265201 (14pp), 2015.05.
2. K. Tomita, K. Nagai, T. Shimizu, N. Bolouki, Y. Yamagata, K. Uchino, T. Kaneko, Thomson scattering diagnostics of atmospheric plasmas in contact with ionic liquids, Appl. Phys. Express, Vol. 7, 066101 (4 pages), 2014.05.
3. T. Morita, Y. Sakawa, K. Tomita, T. Ide, Y. Kuramitsu, K. Nishio, K. Nakayama, K. Inoue, T. Moritaka, H. Ide, M. Kuwada, K. Tsubouchi, K. Uchino, H. Takabe, Thomson scattering measurements of a shock in laser-produced counter-streaming plasmas, Phys. Plasmas, Vol. 20, 092115 (6 pages) (2013), 2013.09.
4. K. Tomita, D. Gojima, K. Nagai, K. Uchino, R. Kamimae, Y Tanaka, K. Suzuki, T. Iijima, T. Uchii, T. Shinkai, Thomson scattering diagnostics of decay processes of Ar/SF6 gas-blast arcs confined by a nozzle, J. Phys. D: Appl. Phys. (Fast Track Communications), Vol. 46, 382001 (5 pages) (2013), 2013.09, Spatiotemporal evolutions of electron density (ne) were successfully measured in decaying SF6 gas-blast arc discharges formed with a long gap (50 mm) in a confined nozzle using laser Thomson scattering. Precise electron density measurement was so far difficult for a long-gap decaying arc discharge in a circuit breaker because of its instability, although it is well known as essential parameter for determination of success or failure of the current interruption in a circuit breaker. Pure Ar gas and 80%Ar/20%SF6 mixture gas were used as arc quenching media at atmospheric pressure. After current zero, measured ne and the arc radius in the Ar/SF6 gas arc clearly decayed more rapidly than in the pure Ar gas arc..
5. K. Tomita, K. Nakayama, K. Inoue, A. Sunahara, K. Uchino, A collective laser Thomson scattering system for diagnostics of laser-produced plasmas for extreme ultraviolet light sources, Appl. Phys. Express, Vol. 6, 076101 (4 pages) (2013), 2013.06.
6. Kentaro Tomita, Nima Bolouki, Hiroki Shirozono, Yukihiko Yamagata, Kiichiro Uchinoa, Koichi Takaki, Two-dimensional Thomson scattering diagnostics of pulsed discharges produced at atmospheric pressure, Journal of Instrumentation, Vol. 7, C02057, 2012.02.
7. K. Tomita, N. Yamamoto, N Yamasaki, T. Tsuru, K. Uchino, H. Nakashima, Thomson Scattering Diagnostics of Plasmas Produced in a Miniature Microwave Discharge Ion Engine, Journal of Propulsion and Power, 26, 2, 381-384, 2010.03.
8. Kentaro Tomita, Taisuke Kagawa, Kiichiro Uchino,Sunao KATSUKI, Hidenori AKIYAMA, Collective Thomson Scattering Diagnostics of EUV Plasmas, Journal of Plasma and Fusion Research SERIES, 8, 1, 488-491, 2009.09.
9. Safwat Hassaballa, Masaaki Yakushiji, Young-Kee Kim, Kentaro Tomita, Kiichiro Uchino, Katsunori Muraoka, Two-Dimensional Structure of PDP Micro-Discharge Plasmas Obtained Using Laser Thomson Scattering, IEEE Trans. Plasma Sci., 10.1109/TPS.2004.823980, 32, 1, 127-134, Vol. 32, pp.127-134, 2004.02.
10. Soushi Narishige, Shuichi Kitamura, Shuji Sakemi, Kentaro Tomita, Kiichiro Uchino, Katsunori Muraoka, Tadanori Sakoda, Thomson Scattering Diagnostics of Glow Discharge Plasmas Produced in Raman Active Gases, Jpn. J. Appl. Phys., 10.1143/JJAP.41.L1259, 41, 11A, L1259-L1262, Vol. 41, pp. L1259-L1262, 2002.11.
1. Collective Thomson Scattering Diagnostics of Plasmas for EUV Light Sources.
Membership in Academic Society
  • The institute of electrical engineers in japan
  • The Japan Society of Applied Physics
  • The Japan Society of Plasma Science and Nuclear Fusion Research