[Table of Contents]

Plasma and Fusion Research

Volume 10, 1201008 (2015)

Rapid Communications

Two-Step Spheroidal Shock Wave Driven by TEA CO2 Laser
Kenta KAWAGUCHI, Ken YONEZAWA, Mitsuo NAKAJIMA and Kazuhiko HORIOKA
Department of Energy Sciences, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan
(Received 22 December 2014 / Accepted 23 January 2015 / Published 19 March 2015)

Abstract

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.

Keywords

laser induced plasma, breakdown, shockwave, laser supported detonation

DOI: 10.1585/pfr.10.1201008

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This paper may be cited as follows:

Kenta KAWAGUCHI, Ken YONEZAWA, Mitsuo NAKAJIMA and Kazuhiko HORIOKA, Plasma Fusion Res. 10, 1201008 (2015).