Supporting Structure of the LSD Wave in an Energy Absorption Perspective

In Repetitively Pulsed (RP) Laser Propulsion, laser energy irradiated to a vehicle is converted to blast wave enthalpy during the Laser Supported Detonation (LSD) regime. Based on the measured post-LSD electron number density profiles by two-wavelength Mach Zehnder interferometer in a line-focusing...

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Bibliographic Details
Published in:AIP conference proceedings 2008-01, Vol.997 (1), p.403-410
Main Authors: Fukui, Akihiro, Hatai, Keigo, Cho, Shinatora, Komurasaki, Kimiya, Arakawa, Yoshihiro
Format: Article
Language:English
Subjects:
CARBON DIOXIDE LASERS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRON DENSITY
ELECTRON TEMPERATURE
ENERGY ABSORPTION
ENERGY BEAM DEPOSITION
ENTHALPY
EXPLOSIONS
HEATING RATE
IONIZATION
LASER RADIATION
LAYERS
MACH-ZEHNDER INTERFEROMETER
PLASMA PRODUCTION
PROPULSION
PULSED IRRADIATION
PULSES
SHOCK WAVES
THERMAL EQUILIBRIUM
VEHICLES
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Summary:In Repetitively Pulsed (RP) Laser Propulsion, laser energy irradiated to a vehicle is converted to blast wave enthalpy during the Laser Supported Detonation (LSD) regime. Based on the measured post-LSD electron number density profiles by two-wavelength Mach Zehnder interferometer in a line-focusing optics, electron temperature and absorption coefficient were estimated assuming Local Thermal Equilibrium. A 10J/pulse CO2 laser was used. As a result, laser absorption was found completed in the layer between the shock wave and the electron density peak. Although the LSD-termination timing was not clear from the shock-front/ionization-front separation in the shadowgraph images, there observed drastic changes in the absorption layer thickness from 0.2 mm to 0.5 mm and in the peak heating rate from 12-17X1013 kW/m3 to 5X1013 kW/m3 at the termination.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2931911