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A novel shock tube with a laser–plasma driver

Published online by Cambridge University Press:  13 September 2017

Y. Kai ,
W. Garen ,
T. Schlegel  and
U. Teubner
Y. Kai*
Affiliation:
Hochschule Emden/Leer, University of Applied Sciences, Institute for Laser and Optics, Constantiaplatz 4, Emden 26723, Germany Carl von Ossietzky University of Oldenburg, Institute of Physics, Oldenburg 26111, Germany
W. Garen
Affiliation:
Hochschule Emden/Leer, University of Applied Sciences, Institute for Laser and Optics, Constantiaplatz 4, Emden 26723, Germany
T. Schlegel
Affiliation:
Hochschule Emden/Leer, University of Applied Sciences, Institute for Laser and Optics, Constantiaplatz 4, Emden 26723, Germany
U. Teubner
Affiliation:
Hochschule Emden/Leer, University of Applied Sciences, Institute for Laser and Optics, Constantiaplatz 4, Emden 26723, Germany Carl von Ossietzky University of Oldenburg, Institute of Physics, Oldenburg 26111, Germany
*
Address correspondence and reprint requests to: Y. Kai, Institute of Physics, Carl von Ossietzky University of Oldenburg, Oldenburg 26111, Germany. E-mail: [email protected]
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Abstract

A novel method to generate shock waves in small tubes is demonstrated. A femtosecond laser is applied to generate an optical breakdown an aluminum film as target. Due to the sudden appearance of this non-equilibrium state of the target, a shock wave is induced. The shock wave is further driven by the expanding high-pressure plasma (up to 10 Mbar), which serves as a quasi-piston, until the plasma recombines. The shock wave then propagates further into a glass capillary (different square capillaries with hydraulic diameter D down to 50 µm are applied). Shock wave propagation is investigated by laser interferometry. Although the plasma is an unsteady driver, due to the geometrical confinement of the capillaries, rather strong micro shocks can still propagate as far as 35 times D. In addition to the experiments, the initial conditions of this novel method are investigated by hydrocode simulations using MULTI-fs.

Keywords

Compressible flowFemtosecond laserInterferometryMicro scale shock wavePlasma physics
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 4 , December 2017 , pp. 610 - 618
Copyright
Copyright © Cambridge University Press 2017 

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