Accurate propagation velocity measurement of laser supported detonation waves

Matsui, Kohei; Shimano, Toru; Ofosu, Joseph A.; Komurasaki, Kimiya; Schoenherr, Tony; Koizumi, Hiroyuki

doi:10.1016/j.vacuum.2016.07.011

Cited by 21 publications

(14 citation statements)

References 6 publications

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“…The process of high-power laser incident into transparent materials can not be described only by a few simple processes, it may contain many phenomena, but in order to simplify the process of interaction, assuming that nonlinear optical processes such as self-focusing and impurity scattering are ignored, and only considering the reflection, transmission and absorption of laser, the general process of physical phenomena caused by the action of laser on the target is as follows [13][14][15][16] : When a high-power long-pulse laser hits the target material, the light will be absorbed, reflected and transmitted in the material. Reflectivity, absorptivity and transmittance should meet the conservation of energy, which is described by the following formula: 𝑅…”

Section: Theoretical Modelsmentioning

confidence: 99%

Numerical simulation of the expansion velocity of laser-induced plasma generated in transparent materials

Cai

Geng

Mao

et al. 2022

Sixth International Symposium on Laser Interaction With Matter

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In the high power laser system, because of the high power of the laser, it is likely to cause damage to the laser devices, making the laser system paralyzed. When a certain high-intensity laser passes through an optical device, part of the energy is absorbed by the device to form physical processes such as ablation, melting and gasification of the material surface. The vaporized target vapor continuously absorbs the laser energy to form an absorption wave maintained by the laser. According to different mechanisms and characteristics, it can be divided into detonation wave and combustion wave. The research on the generation process, mechanism and characteristics of laser supported absorption wave is helpful to the design optimization of laser devices and increase the understanding of the basic physical process of absorption wave. In this paper, the physical process and characteristics of combustion wave induced by long pulse millisecond laser in two transparent materials quartz are studied. In this paper, the process of combustion wave generation is described from a more complete theoretical point of view. First, the process of laser incident on the target to generate combustion wave is described in a more complete theoretical way. Then, the physical characteristics of combustion wave under different parameters, such as the size distribution of expansion velocity, the size distribution of expansion velocity, the generation of combustion wave induced by laser, are obtained through the establishment and Simulation of the combustion wave model Fluid fraction evolution state, etc.

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Section: Theoretical Modelsmentioning

confidence: 99%

Numerical simulation of the expansion velocity of laser-induced plasma generated in transparent materials

Cai

Geng

Mao

et al. 2022

Sixth International Symposium on Laser Interaction With Matter

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“…However, studies using a millimeter-wave band have begun because of the widening use of gyrotrons. According to past studies, the propagation velocity of an ionization front in a millimeter-wave discharge is revealed to have a very different tendency from that in laser discharge, as presented in Figure 8, where the measured propagation velocities in a millimeter-wave discharge using a 170 GHz (wavelength, λ = 1.76 mm) gyrotron [34,35] and a 110 GHz (λ = 2.73 mm) gyrotron [36] are shown along with those in laser discharge obtained using a CO 2 laser (λ = 10.6 μm) with sufficiently large beam spot size [37][38][39]. The propagation velocity of an ionization front in a millimeter-wave discharge is greater than those in laser discharge by one order of magnitude.…”

Section: Propagation Of Ionization Front and Filamentary Plasma Strucmentioning

confidence: 99%

“…Millimeter-wave discharge occurs even at the beam intensity far below breakdown threshold [44]. This discharge cannot be explained by field concentration nor by ambient gas expansion behind a blast wave [45,46] and requires other Figure 8: Ionization-front propagation velocity in an atmospheric millimeter-wave discharge [34,36] and laser discharge [37][38][39]. [44].…”

Section: Numerical Simulation Of Millimeter-wave Discharge Plasmamentioning

confidence: 99%

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

Komurasaki

Tabata

2018

International Journal of Aerospace Engineering

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This paper presents the state of art of Microwave Rocket development and related researches on atmospheric discharge in a high-power millimeter-wave beam. Its operational mechanisms, thruster design, history of development, and flight path and cost analyses are introduced along with millimeter-wave discharge observations and numerical simulations. A thruster model of 126 g weight with no on-board propellant was launched to 1.2 m altitude using a 1 MW class gyrotron. A flight analysis that shows 77% cost reduction is possible using Microwave Rocket as the first stage of H-IIB heavy. A millimeter-wave discharge with unique plasma structure such as a quarter-wavelength microstructure and a comb-shaped filamentary structure was observed and reproduced by a two-dimensional numerical model.

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“…In a recent related study, 21) a uniquely defined relation in atmospheric air with and without confinements of the induced discharge was obtained as: u LID / S 0:46 . That study concluded that, for a laser beam with an effective diameter D, such that D !…”

mentioning

confidence: 99%

“…Laser intensity, S, GWm -2 Helium, D = 5.1 mm -9.1 mm Argon, D = 7.2 mm -9.1 mm Air, D = 5.1 mm -7.2 mm D = 5.1 mm -7.2 mm D = 7.2 mm -9.1 mm D = 5.1 mm -9.1 mmfit_He fit_Ar fit_Air Propagation velocities of LID in Ar, air21) and He gases at 1 atm with sufficiently large Ds.…”

mentioning

confidence: 99%

Laser-Induced Discharge Propagation Velocity in Helium and Argon Gases

Shimano

Ofosu

Matsui

et al. 2017

Trans. Japan Soc. Aero. S Sci.

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IntroductionLaser propulsion 1) is one of the concepts of beamed energy propulsion that has a comparative advantage with respect to conventional chemical rocket systems. This includes high specific impulse and thrust, and low lift-off weight because of the capability of utilizing an off-board energy source. This concept has been demonstrated by the Lightcraft 2) : a laser-propelled launch vehicle. Impulse generation capabilities on the order of one-tenth Ns have also been demonstrated for an ablative-type of laser propulsion. 3) Other applications of laser-induced plasma discharge include, but are not limited to, laser-induced breakdown spectroscopic studies. [4][5][6] Laser-supported detonation (LSD) is known as overdriven detonation in which laser-induced discharge (LID) drives a shock wave. With a decrease in laser intensity S, regime transition occurs from LSD to laser-supported combustion (LSC) due to reduction in the laser-induced discharge propagation velocity u LID . At the laser intensity near this transition threshold, u LID approaches the Chapman-Jouguet (C-J) detonation velocity. The C-J detonation velocity, u C-J is as shown in Eq. (1).

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Accurate propagation velocity measurement of laser supported detonation waves

Cited by 21 publications

References 6 publications

Numerical simulation of the expansion velocity of laser-induced plasma generated in transparent materials

Numerical simulation of the expansion velocity of laser-induced plasma generated in transparent materials

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

Laser-Induced Discharge Propagation Velocity in Helium and Argon Gases

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