TOHOKU UNIVERSITY Researchers - Masayuki Takahashi

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Masayuki Takahashi

Section

Graduate School of Engineering

Job title

Associate Professor

Degree

Doctor of Engineering (Tohoku University)

researchmap

https://researchmap.jp/7000019112

J-GLOBAL ID

201701011958417244

e-Rad No.

00794067

Research History 7

2019/04 - Present

Tohoku University　Department of Aerospace Engineering　Associate Professor
2019/06 - 2020/03

University of Toulouse III Paul Sabatier　Visiting researcher
2016/10 - 2019/03

Tohoku University　Department of Aerospace Engineering　Assistant Professor
2016/04 - 2016/09

Japan Society for the Promotion of Science　Research Fellow PD (The University of Tokyo)
2015/10 - 2016/03

Japan Society for the Promotion of Science　Research Fellow PD (Tohoku University)
2013/04 - 2015/09

Japan Society for the Promotion of Science　Research Fellow DC1 (Tohoku University)
2015/01 - 2015/03

University of Toulouse III Paul Sabatier　Visiting researcher

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Education 3

Tohoku University　School of Engineering　Department of Aerospace Engineering

2012/10 - 2015/09
Tohoku University　School of Engineering　Department of Aerospace Engineering

2011/04 - 2012/09
Tohoku University　School of Engineering　Department of Mechanical and Aerospace Engineering

2007/04 - 2011/03

Professional Memberships 4

米国物理学会
米国航空宇宙学会
プラズマ核融合学会
日本航空宇宙学会

Research Interests 3

Space Propulsion
Beaming propulsion
Plasma

Research Areas 3

Aerospace, marine, and maritime Engineering / Aerospace engineering /
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Fluid engineering /
Energy / Basic plasma science /

Awards 2

Best Presentation Award

2018/03　Japan Shock Wave Society
Student Award

2010/04　The Japan Society for Aeronautical and Space Sciences

Papers 55

Microwave-Driven In-Tube Accelerator Peer-reviewed

Masayuki Takahashi

Journal of Propulsion and Power　41　(6)　716-731　2025/11
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
DOI： 10.2514/1.b39451 　

ISSN： 0748-4658

eISSN： 1533-3876

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A microwave-driven in-tube accelerator (MITA) concept is proposed to improve the thrust performance of microwave rockets driven by repeated intense microwave beam irradiation. A two-dimensional axisymmetric simulation model with a coupling module of electromagnetic wave propagation, plasma reaction diffusion, and neutral gas dynamics was developed, which captured the formation of the beam-induced plasma and shock wave on the MITA. The momentum coupling coefficient of the MITA increases with the beam frequency because a quality of beam focusing is improved, and the energy absorption at the plasma front is enhanced owing to an increase in the electric field intensity around the focal point. However, an increase in the thrust performance saturates when the plasma front, which propagates from the focal point, protrudes into the front side of the vehicle. Therefore, a design parameter, such as the vehicle radius, pulse width, beam intensity, and beam frequency, should be optimized to avoid gas heating at the vehicle front.
Generation of a 28 GHz annular power distribution with high power gyrotron and its application to microwave driven in tube accelerator Peer-reviewed

Masayuki Takahashi, Toshiki Yamada, Ryutaro Minami, Tsuyoshi Kariya, Kohei Shimamura

Scientific Reports　15　24274　2025/07/07
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-025-08430-3 　

eISSN： 2045-2322

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Abstract The microwave-driven in-tube accelerator (MITA) concept, which installs the center body of the thruster inside the waveguide and generates thrust via millimeter-wave beam irradiation from the front side of the center body, was experimentally demonstrated using 210-kW and 28-GHz gyrotron device. For the 28-GHz beams, a vortex phase plate was newly designed to change the incident beam profile from a Gaussian to a donut-shaped pattern, which was installed in front of the thruster’s center body. Without the vortex phase plate, gas breakdown occurred at the center-body head, providing a negative impulse. However, as the electric field concentration at the center-body head was avoided using the vortex phase plate, plasma and strong shock wave generation were obtained at the rear side of the vehicle, inducing a positive impulse to accelerate the thruster toward the beam source direction. The MITA thrust performance increased as the incident beam pulse width increased because gas heating was enhanced at the rear side of the center body.
Experimental demonstration of interferometric discharge structure identification of atmospheric millimeter-wave discharge at subcritical conditions using 28 GHz gyrotron Peer-reviewed

S. Suzuki, M. Matsukura, T. Yamada, Y. Masuda, M. Takahashi, K. Shimamura, R. Minami, T. Kariya

Physics of Plasmas　32　(7)　073510　2025/07/01
Publisher: AIP Publishing
DOI： 10.1063/5.0252981 　

ISSN： 1070-664X

eISSN： 1089-7674

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The relationships between the ionization front propagation and standing-wave intensity of a millimeter-wave were experimentally investigated using a 28 GHz gyrotron in a millimeter-wave discharge plasma under subcritical conditions. The time variation of the standing-wave intensity measured by a fixed rectenna was slower when the ionization front propagated continuously, whereas it varied rapidly with a spectrum containing high-frequency components when the ionization front propagated intermittently. High-speed camera observations revealed that the waveform variation was synchronized with the timing of streamer elongation. This small-scale observation method can be applied to monitor millimeter-wave discharge plasma in a beamed energy propulsion rocket.
Experimental demonstration of tractor millimeter wave beam propulsion Peer-reviewed

Masayuki Takahashi, Toshiki Yamada, Ryutaro Minami, Tsuyoshi Kariya, Kohei Shimamura

Scientific Reports　15　17544　2025/05/20
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-025-02791-5 　

eISSN： 2045-2322

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Abstract Tractor millimeter-wave beam propulsion (TMiP), which obtains a propulsive force by receiving a high-power tractor beam from the front side of the vehicle, was proposed for space missions such as rocket launches from Earth and planetary takeoff missions. A beam irradiation experiment with a gyrotron device was conducted for a model rocket with a polytetrafluoroethylene (PTFE) lens to collect the tractor beam power, facilitating gas breakdown and plasma generation at the focal point. A high-pressure gas was formed via plasma heating, interacting with the PTFE lens mounted on the front of the vehicle and generating a propulsive force for rocket launching. A parametric study was conducted by changing the pulse width, which showed that the maximum thrust performance was achieved when the plasma front propagating toward the beam source did not protrude from the air-breathing intake at the front of the vehicle. Additionally, computational simulations for electromagnetic wave propagation and compressible fluid dynamics indicated that the thrust performance could be improved by decreasing the rocket diameter due to shock wave concentration.
Free-flight and tracking experiments of a multi-parabola laser propulsion vehicle Peer-reviewed

Masayuki Takahashi, Yuya Hayadate, Koichi Mori, Akihiro Hayakawa

Scientific Reports　15　15513　2025/05/03
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-025-00429-0 　

eISSN： 2045-2322

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Abstract A free-flight experiment involving a multi-parabola laser propulsion vehicle was conducted using repetitive laser pulses at a repetition frequency of 50 Hz and an energy of 4.93 J per pulse. Observations made with a camera indicated that the vehicle achieved a maximum altitude of 110 mm; however, it deviated from the laser beam line due to initial misalignment of the laser setup. To improve flight stability, we developed a tracking system to monitor the vehicle’s motion and control the laser irradiation position. Performance requirements were assessed based on the free-flight experiment data, revealing that the vehicle attained a maximum translational speed of 0.08 m/s before deviation occurred. Our tracking system was evaluated to have a trackable speed of 0.09 m/s, meeting the performance requirements for free flight and capable of stabilizing the repetitive pulse flight of a laser propulsion vehicle.
Numerical Simulations for Rarefied Gas Compression and Plasma Ignition Dynamics on Air-breathing Electric Propulsion

Masayuki Takahashi, Koki Ito, Yusuke Nakamura

Proceedings of the 39th International Electric Propulsion Conference　IEPC 2025　156　2025
Numerical simulation of electromagnetic-wave interference induced by ionization-front of millimeter-wave discharge at subcritical conditions and application to discharge structure identification Peer-reviewed

S. Suzuki, M. Takahashi

Journal of Applied Physics　136　(15)　153301　2024/10/15
Publisher: AIP Publishing
DOI： 10.1063/5.0225500 　

ISSN： 0021-8979

eISSN： 1089-7550

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A standing wave induced in front of the ionization-front of a millimeter-wave discharge was numerically investigated to develop an interferometric discharge structure identification method. The time-varying waveform of the standing-wave intensity obtained at a distant observation point was smooth when a continuous comb-shaped structure was formed, whereas it was noisy with high-frequency components when a discrete structure was formed. The peak frequency of the Fourier spectrum of the time-varying waveform was proportional to the ionization-front propagation speed. The rapid time-variation of the waveform was caused by an increase in millimeter-wave absorption in a new plasma spot formation in the discrete structure. The results suggest that discharge structure identification, measurement of ionization-front propagation, and timing of plasma spot formation can be conducted experimentally without using a high-speed camera.
Integrating sheath and radiation-based acceleration using scaling coefficients for tailoring radiation dominant hybrid acceleration Peer-reviewed

Harihara Sudhan Kumar, Masayuki Takahashi, Yasuhiro Kuramitsu, Naofumi Ohnishi

Scientific Reports　14　22531　2024/09/28
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-024-72623-5 　

eISSN： 2045-2322
A hybrid simulation integrating molecular dynamics and particle-in-cell methods for improved laser-target interaction Peer-reviewed

Harihara Sudhan Kumar, Masayuki Takahashi, Yasuhiro Kuramitsu, Takumi Minami, Hiromitsu Kiriyama, Yuji Fukuda, Naofumi Ohnishi

High Energy Density Physics　53　101148　2024/08
Publisher: Elsevier BV
DOI： 10.1016/j.hedp.2024.101148 　

ISSN： 1574-1818
Numerical analysis of structural change process in millimeter-wave discharge at subcritical intensity Peer-reviewed

S. Suzuki, K. Hamasaki, M. Takahashi, C. Kato, N. Ohnishi

Physics of Plasmas　29　(9)　093507　2022/09/01
Publisher: AIP Publishing
DOI： 10.1063/5.0096363 　

ISSN： 1070-664X

eISSN： 1089-7674

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Plasma-front propagation processes of 170 GHz millimeter-wave discharge were investigated under subcritical incident electric field intensity by using a one-dimensional model. The discharge structure was numerically reproduced at more than 0.2 MV/m by introducing the detailed chemical reaction and radiation transport processes into the conventional model. The results revealed that the propagation mechanism of the plasma front in the millimeter-wave discharge changes depending on the incident electric field intensity. At intensities greater than 1.4 MV/m, the plasma front propagated at supersonic speed, while forming a discrete structure, which has intervals of 1/4 wavelength of the millimeter wave. This structure was generated by electron-impact ionization and photoionization processes. At the intermediate intensities, the plasma front propagated continuously rather than discretely because the gas expansion increased the reduced electric field and induced electron-impact ionization. The dominant heating process at the plasma front was fast gas heating. At intensities less than 0.3 MV/m, the plasma front propagated continuously, but the dominant heating process changed to vibrational–translational relaxation. The discharge was maintained by thermal ionization and associative ionization. The simulation results were in good agreement with the past millimeter discharge experiments at this intensity.
Plasma propagation via radiation transfer in millimeter-wave discharge under subcritical condition Peer-reviewed

S Suzuki, C Kato, M Takahashi, N Ohnishi

Journal of Physics: Conference Series　2207　012046　2022/03/01
Publisher: IOP Publishing
DOI： 10.1088/1742-6596/2207/1/012046 　

ISSN： 1742-6588

eISSN： 1742-6596

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Abstract An improved model was proposed to reduce a computational cost for subcritical millimeter-wave discharge. The proposed model was able to reproduce the plasma-front propagation via radiation transport as similar to the conventional model, and the plasma-front propagation speed was in agreement with the previous simulation. An electron transport effect by neutral fluid advection, which has been introduced into the conventional model, does not affect the propagation speed. By using the presented model, a computational time was reduced by 35%, which was suitable for a multi-dimensional simulation in the future.
Coupling Simulation on Two-dimensional Axisymmetric Beaming Propulsion System Peer-reviewed

Masayuki Takahashi

Journal of Physics: Conference Series　2207　012047　2022/03/01
Publisher: IOP Publishing
DOI： 10.1088/1742-6596/2207/1/012047 　

ISSN： 1742-6588

eISSN： 1742-6596

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Abstract A two-dimensional (2D) axisymmetric fluid modeling for plasma dynamics was coupled with an electromagnetic wave propagation to capture the electromagnetic wave and plasma structures on the microwave-driven in-tube accelerator (MITA) concept. The electromagnetic wave injected into a waveguide was focused on at the vehicle’s rear side through reflection processes by the front mirror and the waveguide. An overcritical plasma was created at the high-intensity electric field region because of enhancement of an electron-impact ionization. The incident microwave was reflected by the plasma with overcritical density and a standing wave was induced in front of the dense plasma because the reflected wave overlapped with the incident microwave. In addition to wave enhancement by standing process, the strong electric field region was obtained at edges of the overcritical plasma because of wave diffraction, which can affect a shock wave strength and thrust performance of the MITA.
Plasma and Shock Wave Propagations on Microwave-driven In-tube Accelerator

Masayuki Takahashi

Proceedings of the 37th International Electric Propulsion Conference　IEPC 2022　429　2022
Numerical Study of Plasma Transport Driven by the Wavy-microstructure in a Hall-effect Thruster

Naoki Tsunezawa, Masayuki Takahashi, Naofumi Ohnishi

Proceedings of the 37th International Electric Propulsion Conference　IEPC 2022　355　2022
Kinetic theory of double layers driven by temperature anisotropy in a non-homogeneous magnetic field Peer-reviewed

Harihara Sudhan Kumar, Masayuki Takahashi, Chinami Kato, Yuya Oshio, Naofumi Ohnishi

Journal of Applied Physics　130　(16)　163303　2021/10/28

DOI： 10.1063/5.0065665 　

ISSN： 0021-8979

eISSN： 1089-7550
Computational Study of Discharge Process in Plasma Actuator for Enhanced Electrohydrodynamic Force Generation toward Low-Voltage Operation Peer-reviewed

Shintaro SATO, Haruki FURUKAWA, Masayuki TAKAHASHI, Naofumi OHNISHI

Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan　19　(1)　17-23　2021
Publisher: Japan Society for Aeronautical and Space Sciences
DOI： 10.2322/tastj.19.17 　

eISSN： 1884-0485
New insights into the physics of rotating spokes in partially magnetized E × B plasmas Peer-reviewed

J. P. Boeuf, M. Takahashi

Physics of Plasmas　27　(8)　083520　2020/08
Publisher: AIP Publishing
DOI： 10.1063/5.0014357 　

ISSN： 1070-664X

eISSN： 1089-7674
A study on the macroscopic self-organized structure of high-power millimeter-wave breakdown plasma Peer-reviewed

Yasuhisa Oda, Masayuki Takahashi, Naofumi Ohnishi, Kimiya Komurasaki, Keishi Sakamoto, Tsuyoshi Imai

Plasma Sources Science and Technology　29　(7)　075010　2020/07/29
Publisher: IOP Publishing
DOI： 10.1088/1361-6595/ab9d67 　

eISSN： 1361-6595
A fast solver of plasma fluid model in dielectric-barrier-discharge simulation Peer-reviewed

Shintaro Sato, Takashi Shiroto, Masayuki Takahashi, Naofumi Ohnishi

Plasma Sources Science and Technology　29　(7)　075007　2020/06/09
Publisher: IOP Publishing
DOI： 10.1088/1361-6595/ab9b18 　

ISSN： 0963-0252

eISSN： 1361-6595
Rotating Spokes, Ionization Instability, and Electron Vortices in Partially Magnetized E×B Plasmas Peer-reviewed

Jean-Pierre Boeuf, Masayuki Takahashi

Physical Review Letters　124　(18)　185005　2020/05/08
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevlett.124.185005 　

ISSN： 0031-9007

eISSN： 1079-7114
Effect of multi-mode interaction on hypersonic boundary layer instbiliaty

Yuichiro Uda, Masayuki Takahashi, Naofumi Ohnishi, Hideyuki Tanno

AIAA Paper　2020　1821　2020
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2020-1821 　
Gas propellant dependency of plasma structure and thrust performance of microwave rocket Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Journal of Applied Physics　125　(16)　163303　2019/04/28
Publisher: AIP Publishing
DOI： 10.1063/1.5053086 　

ISSN： 0021-8979

eISSN： 1089-7550
Proposal and Performance Evaluation of Microwave-driven In-tube Accelerator Concept

Masayuki Takahashi

Proceedings of he 36th International Electric Propulsion Conference　IEPC 2019　A577　2019
Numerical study of discharge and thrust generation in a microwave rocket

Masayuki Takahashi, Naofumi Ohnishi

AIAA Paper　2019　1242　2019
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2019-1242 　
Numerical study of unsteady high enthalpy flow in an expansion tube

Kazumasa Kitazono, Masayuki Takahashi, Naofumi Ohnishi, Hideyuki Tanno

AIAA Paper　2019　1392　2019
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2019-1392 　
Discharge process and gas heating effect in nanosecond-pulse-driven plasma actuator

Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

AIAA Paper　2019　1001　2019
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2019-1001 　
Successively accelerated ionic wind with integrated dielectric-barrier-discharge plasma actuator for low-voltage operation Peer-reviewed

Sato Shintaro, Furukawa Haruki, Komuro Atsushi, Takahashi Masayuki, Ohnishi Naofumi

Scientific Reports　9　5813　2019

DOI： 10.1038/s41598-019-42284-w 　

ISSN： 2045-2322
Postural Control for Beam-Riding Flight of a Microwave Rocket Using an External Magnetic Field Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan　17　(4)　525-530　2019
Thrust-Performance Maximization of Microwave Rocket Sustained by Resonant Magnetic Field Peer-reviewed

Masayuki TAKAHASHI, Naofumi OHNISHI

Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan　17　(4)　531-537　2019
Publisher: Japan Society for Aeronautical and Space Sciences
DOI： 10.2322/tastj.17.531 　

eISSN： 1884-0485
Gas-species-dependence of microwave plasma propagation under external magnetic field Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Journal of Applied Physics　124　(17)　173301　2018/11/07
Publisher: AIP Publishing
DOI： 10.1063/1.5010096 　

ISSN： 0021-8979

eISSN： 1089-7550
Numerical Study of Discharge Physics Induced by Subcritical Millimeter Wave

Kanta Hamasaki, Masayuki Takahashi, Naofumi Ohnishi

Proceedings of 43rd International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2018　2018/10/25
Publisher: IEEE Computer Society
DOI： 10.1109/IRMMW-THz.2018.8510111 　

ISSN： 2162-2035 2162-2027
Numerical Study of Millimeter-Wave Discharge and Application to Launching System for Small Satellites

Masayuki Takahashi, Naofumi Ohnishi

Proceedings of 43rd International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2018　2018/10/25
Publisher: IEEE Computer Society
DOI： 10.1109/IRMMW-THz.2018.8510247 　

ISSN： 2162-2035 2162-2027
Frequency dependence of atmospheric millimeter wave breakdown plasma

Yasuhisa Oda, Masayuki Takahashi, Kuniyoshi Tabata, Naofumi Ohnishi, Kimiya Komurasak, Keishi Sakamoto

Proceedings of 43rd International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz　2018　2018/10/25

DOI： 10.1109/IRMMW-THz.2018.8510051 　

ISSN： 2162-2027

eISSN： 2162-2035
Separation control on an airfoil using repetitive laser pulses

Masayuki Takahashi, Naofumi Ohnishi

AIAA Paper　2018　1430　2018
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2018-1430 　
Induced flow simulation with detailed discharge modeling in dielectric-barrier-discharge plasma actuator

Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

AIAA Paper　2018　1293　2018
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2018-1293 　
Open-front approach of a microwave rocket sustained by a resonant magnetic field Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Journal of Propulsion and Power　34　(3)　762-771　2018
Publisher: American Institute of Aeronautics and Astronautics Inc.
DOI： 10.2514/1.B36621 　

ISSN： 0748-4658
Computational Studies of Body Force Production Process and Performance Improvement in a Dielectric-Barrier-Discharge Plasma Actuator Peer-reviewed

Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan　16　(6)　550-555　2018
Enhanced electrohydrodynamic force generation in a two-stroke cycle dielectric-barrier-discharge plasma actuator Peer-reviewed

Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

Applied Physics Letters　110　(19)　194101　2017/05

DOI： 10.1063/1.4983370 　

ISSN： 0003-6951

eISSN： 1077-3118
Joule-heating-supported plasma filamentation and branching during subcritical microwave irradiation Peer-reviewed

Masayuki Takahashi, Yoshiaki Kageyama, Naofumi Ohnishi

AIP Advances　7　(5)　055206　2017/05

DOI： 10.1063/1.4983569 　

ISSN： 2158-3226
Development of Plasma Fluid Model for a Microwave Rocket Supported by a Magnetic Field Peer-reviewed

Masayuki Takahashi

Journal of Physics: Conference Series　905　012024　2017
Asymmetric Shock Wave Generation in a Microwave Rocket Using a Magnetic Field Peer-reviewed

Masayuki Takahashi

Journal of Physics: Conference Series　905　012020　2017
Plasma filamentation and shock wave enhancement in microwave rockets by combining low-frequency microwaves with external magnetic field Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Journal of Applied Physics　120　(6)　063303　2016/08

DOI： 10.1063/1.4960805 　

ISSN： 0021-8979

eISSN： 1089-7550
Numerical study of breakdown pattern induced by an intense microwave under nitrogen and argon gases Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Japanese Journal of Applied Physics　55　(7)　07LD02-1-07LD02-6　2016/07

DOI： 10.7567/JJAP.55.07LD02 　

ISSN： 0021-4922

eISSN： 1347-4065
Beam-Riding Flight of a Laser Propulsion Vehicle Using Actively Controlled Pulse Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Journal of Propulsion and Power　32　(1)　237-250　2016/01

DOI： 10.2514/1.B35631 　

ISSN： 0748-4658

eISSN： 1533-3876
Shock Formation by Plasma Filaments of Microwave Discharge under Atmospheric Pressure Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Journal of Physics: Conference Series　688　012119　2016

DOI： 10.1088/1742-6596/688/1/012119 　

ISSN： 1742-6588
Thrust Performance of Microwave Rocket at Low Ambient Pressure Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan　14　(ists30)　Pb_209-Pb_215　2016
Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
DOI： 10.2322/tastj.14.Pb_209 　

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<p>A particle model of plasma was coupled with electromagnetic wave propagation to reproduce a filamentary structure and diffusive pattern in a microwave breakdown. The thrust performance of a microwave rocket was estimated by combining discharge calculation and computational fluid dynamics (CFD). An external magnetic field is applied to the discharge volume to improve thrust performance for low ambient pressure by combination of magnetic confinement and resonance heating technique. The magnetic field suppresses the propagation speed of the ionization front because the electron cannot cross the magnetic field at lower pressure, whereas propagation speed increases with decreased ambient pressure when no magnetic field is applied. The energy absorption rate increases when electron cyclotron resonance (ECR) occurs with the corresponding magnetic field, which improves the thrust performance of the microwave rocket.</p>
Theoretical and Numerical Studies of Dynamic Scaling of a Six-Degree-of-Freedom Laser Propulsion Vehicle Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

International Journal of Aerospace Engineering　2015　801371　2015

DOI： 10.1155/2015/801371 　

ISSN： 1687-5966

eISSN： 1687-5974
Computational studies for plasma filamentation by magnetic field in atmospheric microwave discharge Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Applied Physics Letters　105　(22)　223504　2014/12

DOI： 10.1063/1.4903232 　

ISSN： 0003-6951

eISSN： 1077-3118
Beaming Flight of Repetitive-Pulse Powered Vehicle for Satellite Launch Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Transactions of the Japan Society for Aeronautical and Space Science, Aerospace Technology Japan　12　(ists29)　Pb_97-Pb_102　2014
Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
DOI： 10.2322/tastj.12.Pb_97 　

ISSN： 1884-0485

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To present a feasibility of high-altitude flight of a laser-propelled vehicle at supersonic speed, we have developed a flight simulator which has fluid-orbit coupling calculation module to reproduce impulsive flight reaction driven by blast waves. By high-power energy transmission through arrayed lasers together with the genetic algorithm (GA) controlled sub-laser, the supersonic flight is successfully achieved in the simulation for 32.5-g vehicle, while the angular offset should be suppressed as small as possible. Rather than translational position, controlling angular offsets by the GA operation is especially important to attain the km-order flight on the premise of the active control. Additionally, the vehicle weight, the vehicle size, and the input energy are scaled up to assess the stable flight of 10-kg vehicle. The active control technique has enough possibility to launch kg-order vehicle at supersonic regime with the optimized beaming strategy.
Supersonic and Stable Flight of Beam Riding Vehicle Using Optimized Multiple Pulses

Masayuki Takahashi, Naofumi Ohnishi

AIAA Paper　2013　0206　2013/01/05
Publisher: American Institute of Aeronautics and Astronautics
DOI： 10.2514/6.2013-206 　
6-DOF Flight Dynamics of Laser-Boosted Vehicle Driven by Blast Wave

Masayuki Takahashi, Naofumi Ohnishi

Proceedings of the 33rd International Electric Propulsion Conference　IEPC 2013　179　2013
Fluid-orbit coupling calculation for flight analysis of impulsively driven laser vehicle Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Journal of Physics: Conference Series　454　012004　2013

DOI： 10.1088/1742-6596/454/1/012004 　

ISSN： 1742-6588
Beam Riding Performance of Asymmetrically Propelled Laser Vehicle Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

AIAA Journal　50　(11)　2600-2608　2012/11

DOI： 10.2514/1.J051822 　

ISSN： 0001-1452
Performance Analysis of Beam Riding Vehicle with Motion Synchronized Laser Pulse

Masayuki Takahashi, Naofumi Ohnishi

AIAA Paper　2012　3302　2012/06/25
Publisher: American Institute of Aeronautics and Astronautics
DOI： 10.2514/6.2012-3302 　
Three-Dimensional Numerical Analysis for Posture Stability of Laser Propulsion Vehicle Peer-reviewed

Masayuki Takahashi, Naofumi Ohnishi

Proceedings of Beamed Energy Propulsion: Seventh International Symposium　1402　(1)　132-141　2011

DOI： 10.1063/1.3657022 　

ISSN： 0094-243X

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Misc. 6

Discharge in a High Intensity Millimeter-Wave Beam and Its Application to Propulsion Invited Peer-reviewed

Masayuki Takahashi, Kimiya Komurasaki

Advances in Physics: X　1　1417744　2018
Physics of Millimeter-Wave Discharge and Its Application to Microwave Rocket Invited Peer-reviewed

Masayuki Takahashi

Journal of Plasma Fusion Research　93　(10)　478-483　2017
Publisher: プラズマ・核融合学会編集委員会
ISSN： 0918-7928
Numerical Study of Microwave Rocket for Improvement of Thrust Performance

59　5p　2015/10/07
Publisher: 日本航空宇宙学会
ISSN： 1884-1945
Ionization Frequency Dependence of Atmospheric Plasma Formation by High-Power Microwave

58　4p　2014/11/12
Publisher: 日本航空宇宙学会
ISSN： 1884-1945
Stable Flight of kg-order Laser Propelled Vehicle Using Active Control

57　5p　2013/10/09
Publisher: 日本航空宇宙学会
ISSN： 1884-1945
S052021 Hybrid Simulation of Dielectric Barrier Discharge and Induced Flow

OHNISHI Naofumi, SUGIMOTO Kazuya, TAKAHASHI Masayuki

Mechanical Engineering Congress, Japan　2013　"S052021-1"-"S052021-4"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

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Modeling of minute plasma formation is of great importance around electrodes of a plasma actuator(PA) utilizing dielectric barrier discharge(DBD)with a relatively low computational cost. Although electrons need some distance to acquire sufficient energy causing impact ionization, such a transient phenomenon cannot be described in a conventional fluid model because of local field approximation. In order to simulate appropriate discharge process in the DBD-PA, a hybrid code coupling with a particle model was constructed, which treats high-density region as the fluid model but high electric field region as the particle model. The hybrid simulation reproduced spreading of the high-density region from the exposed electrode for the positively biased case as well as the full-particle simulation.

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Books and Other Publications 1

Beamed-mobility engineering : wireless-power beaming to aircrafts, spacecrafts and rockets

Mori, Koichi, Oda, Yasuhisa, Takahashi, Masayuki, Shimamura, Kohei

Springer　2024

ISBN: 9789819946174

Research Projects 8

Statistical Evaluation of Uncertainties in Beam-induced Plasma and Its Application to Beaming Propulsion

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2024/04/01 - 2027/03/31
大気吸い込み型電気推進機確立に向けたレーザーデトネーション風洞による極超音速流生成

Offer Organization: 公益財団法人天野工業技術研究所

System: 研究助成金

2023/09 - 2024/08
ビーム誘起爆轟現象のメカニズム解明と推進ロケットへの応用

Offer Organization: 公益財団法人火薬工業技術奨励会

System: 研究助成金

2023/04 - 2024/03
Establishment of Flow Control Device for Achieving Low-boom and High-lift Supersonic Aircraft

Masayuki Takahashi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Early-Career Scientists

Institution: Tohoku University

2020/04/01 - 2022/03/31

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A flight performance of an aerospace vehicle can be improved using a remote energy transfer because beam-induced shock wave and plasma changes a flow field around the vehicle. A numerical simulation was conducted to understand a discharge physics, which implied that a radiation transfer and a thermal ionization process played an important role on the plasma-front propagation. Moreover, the beam irradiation and discharge experiments indicated that a lift performance of the aerospace vehicle can be improved.
Establishment of Flight Technique of Next Generation Rocket Driven by High-Intensity Electromagnetic Beam Competitive

TAKAHASHI Masayuki

Offer Organization: Japan Society for the Promotion of Science

System: KAKENHI Wakate B

2017/04 - 2020/03
Establishment of Advanced Flow Control Device for Low Boom and High Lift-to-Drag Ratio of Supersonic Aircraft Competitive

TAKAHASHI Masayuki

Offer Organization: The Ebara Hatakeyama Memorial Foundation

System: Research Support

2018/07 - 2019/03
Establishment of High Thrust and Stable Flight Techniques of Beamed Energy Propulsion for Orbital Injection of Small Satellites Competitive

TAKAHASHI Masayuki

Offer Organization: Japan Society for the Promotion of Science

System: KAKENHI for Research Fellow

2016/04 - 2019/03
Study for Supersonic Stable Flight of Laser Propulsion Vehicle to Launch Small Satellites Competitive

TAKAHASHI Masayuki

Offer Organization: Japan Society for the Promotion of Science

System: KAKENHI for Research Fellow

2013/04 - 2016/03

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