Development of a Novel Launch System Microwave Rocket Powered by Millimeter-Wave Discharge

Komurasaki, Kimiya; Tabata, Kuniyoshi

doi:10.1155/2018/9247429

Cited by 24 publications

(4 citation statements)

References 37 publications

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“…The beamed energy propulsion can achieve low launch costs. 1,2) A possible mechanism of the MSD process is explained hereinafter. First, the electrons in front of a bulk plasma absorb part of millimetre-wave energy and seed electrons are produced.…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium aerodynamics between ionization-wave and shock-wave fronts in millimetre-wave supported detonation

Tabata,

Oda,

Komurasaki

et al. 2023

Jpn. J. Appl. Phys.

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A shock wave driven by discharge plasma propagating in a high-power millimetre-wave beam was investigated both experimentally and numerically. A shadowgraph experiment was used to visualize the shock wave and plasma. The ionization wave front of the plasma preceded the shock wave by 2.0–4.0 mm under conditions of 170 GHz beam frequency, atmospheric pressure, and 1.1 GW/m2 peak power density (power density at the beam axis). Furthermore, a two-dimensional Computational Fluid Dynamics (CFD) simulation considering non-equilibrium temperatures and filamentary plasma structures revealed that an ionization-wave front precedes a shock wave front because the energy relaxation requires a few micro-seconds from vibrational excitation at a plasma front to translational excitation for the shock wave formation. Consequently, the distance between an ionization wave front and shock wave front is 3.8 mm in the two-dimensional CFD simulation, which agreed with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Non-equilibrium aerodynamics between ionization-wave and shock-wave fronts in millimetre-wave supported detonation

Tabata,

Oda,

Komurasaki

et al. 2023

Jpn. J. Appl. Phys.

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“…Atmospheric millimeter-wave discharge may be useful as an ultraviolet light source, 3,4 for detection of radioactive materials, 5 for chemical decomposition, 6 and for beamed energy propulsion. [7][8][9][10][11][12] In propulsion applications, millimeter-wave energy is converted efficiently to gas pressure through the atmospheric discharge. First, after a millimeter-wave beam is focused by a parabolic mirror, plasma is ignited.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of ionization front propagating in a 28 GHz gyrotron beam: Observation of plasma structure and spectroscopic measurement of gas temperature

Tabata

Harada

Nakamura

et al. 2020

Journal of Applied Physics

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Atmospheric millimeter-wave discharge was investigated experimentally using a 28 GHz gyrotron. The propagation velocity of an ionization front, plasma structure, and vibrational and rotational temperatures of nitrogen molecules were measured at a beam intensity lower than 1.0 GW/m 2 , which is below the breakdown threshold. Results show that the propagation velocity of an ionization front increased monotonically with beam intensity and decreased with ambient pressure. In addition, four typical plasma structures having different space occupancies were observed. Furthermore, at any beam intensity below 0.5 GW/m 2 , the vibrational temperature was found to be saturated at about 6000 K. The corresponding electron number density is almost equal to the cut-off density. Finally, it was suggested that the propagation velocity depends on the plasma space occupancy.

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“…Implementation of such a source opens up new prospects for the development of nearly power‐unbounded complexes with a great number (from tens to thousands) of frequency‐locked megawatt gyrotrons. Such complexes are needed for a variety of scientific and technical applications …”

Section: Introductionmentioning

confidence: 99%

Design of master oscillator for frequency locking of a complex of megawatt level microwave sources

Денисов

Kuftin

Мануилов

et al. 2020

Micro & Optical Tech Letters

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We present the results of the development of a highly stable gyrotron (with long‐term stability of an operating frequency of 170 GHz being equal to 10−9) for experiments on frequency locking and control of megawatt power sources. The electron‐optical and electrodynamic systems of the gyrotron are calculated and optimized, including the magnetron‐injection gun, interaction space, collector, and quasioptical converter of radiation into a Gaussian wave beam. Main requirements for such systems are described along with their specific features, which allow one to develop a relatively simple, low cost, and reliable master generator for synchronization of a large number of continuous‐wave megawatt gyrotrons. This reveals new possibilities for creation of gyrotron complexes capable of generation coherent radiation of nearly unlimited power levels.

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Development of a Novel Launch System Microwave Rocket Powered by Millimeter-Wave Discharge

Cited by 24 publications

References 37 publications

Non-equilibrium aerodynamics between ionization-wave and shock-wave fronts in millimetre-wave supported detonation

Non-equilibrium aerodynamics between ionization-wave and shock-wave fronts in millimetre-wave supported detonation

Experimental investigation of ionization front propagating in a 28 GHz gyrotron beam: Observation of plasma structure and spectroscopic measurement of gas temperature

Design of master oscillator for frequency locking of a complex of megawatt level microwave sources

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