Two-Step Spheroidal Shock Wave Driven by TEA CO2 Laser

A conical target made of brass was irradiated by a transversely excited atmospheric CO2 laser having a pulse duration of ∼ µs in atmospheric air and He. A two-step structure composed of two spheroidal shock waves was observed to be driven by the irradiation. The shock front evolved at more than 7 km...

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Bibliographic Details
Published in:Plasma and Fusion Research 2015/03/19, Vol.10, pp.1201008-1201008
Main Authors: KAWAGUCHI, Kenta, YONEZAWA, Ken, NAKAJIMA, Mitsuo, HORIOKA, Kazuhiko
Format: Article
Language:English
Subjects:
breakdown
Carbon dioxide
Carbon dioxide lasers
Evolution
Irradiation
laser induced plasma
laser supported detonation
Mach number
Pulse duration
Shock waves
shockwave
TEA lasers
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Summary:A conical target made of brass was irradiated by a transversely excited atmospheric CO2 laser having a pulse duration of ∼ µs in atmospheric air and He. A two-step structure composed of two spheroidal shock waves was observed to be driven by the irradiation. The shock front evolved at more than 7 km/s corresponding to a shock Mach number of 20. Before the two-step evolution of the shock wave, we observed a streamer-like structure in the laser-irradiated region, which indicates a phenomenon driven by energetic electrons.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.10.1201008