Title :
Radiation structure of laser-produced plasma at low-Mach number by 2-wavelength Mach-Zehnder interferometer
Author :
Shimamura, Kohei ; Ofosu, Joseph A. ; Fukunari, Masafumi ; Komurasaki, Kimiya ; Koizumi, Hirotaka
Author_Institution :
Dept. of Adv. Energy, Univ. of Tokyo, Kashiwa, Japan
Abstract :
Propagation of a laser detonation wave was studied by two-wavelength Mach-Zehnder interferometry and laser-shadowgraph. To investigate the termination mechanism of the laser detonation wave, this study used a wedge nozzle and made a quasi-one dimensional propagation because the lateral expansion greatly influenced the LSD termination condition. We also investigated the dependency of gaseous form; N2 and O2. As a result, the velocity of the detonation front in O2 was faster than N2. The peak of the electron density profile in O2 was higher than that in N2. Furthermore, this distribution tends to increase when the position gets close to the target wall. This result has never been observed in two-dimensional situation.
Keywords :
Mach number; Mach-Zehnder interferometers; detonation waves; electron density; nitrogen; nozzles; oxygen; plasma density; plasma diagnostics; plasma light propagation; plasma production by laser; plasma shock waves; plasma transport processes; LSD termination condition; N2; O2; electron density distribution; laser detonation wave front velocity; laser detonation wave propagation; laser shadowgraph; laser-produced plasma; low-Mach number; radiation structure; target wall; two-wavelength Mach-Zehnder interferometer; wedge nozzle; Ionization; Laser beams; Laser theory; Laser transitions; Measurement by laser beam; Plasmas; Propulsion;
Conference_Titel :
Pulsed Power Conference (PPC), 2013 19th IEEE
Conference_Location :
San Francisco, CA
DOI :
10.1109/PPC.2013.6627537
