Laser beam distortion propagation through a shock wave arising in a supersonic flows past turret in a homogeneous medium

2016 ◽  
Author(s):  
V. A. Banakh ◽  
A. A. Sukharev
Keyword(s):  
Shock Wave ◽  
Laser Beam ◽  
Homogeneous Medium ◽  
Supersonic Flows

scholarly journals Shock propagation into inhomogeneous media

1970 ◽  
Vol 43 (3) ◽  
pp. 487-495 ◽  
Author(s):  
J. D. Strachan ◽  
J. P. Huni ◽  
B. Ahlborn
Keyword(s):  
Shock Wave ◽  
Shock Front ◽  
Rarefaction Wave ◽  
Particle Velocity ◽  
Homogeneous Medium ◽  
Inhomogeneous Media ◽  
Front Velocity ◽  
Shock Propagation ◽  
Analytic Relation

An analytic relation is derived for the shock front velocity as a function of the initial parameters (pressure, density, and particle velocity) in a continuous, in-homogeneous medium. This relation was verified experimentally by using it to predict the propagation of a shock wave through a known rarefaction wave.

scholarly journals Short-wavelength experiments on laser pulse interaction with extended pre-plasma at the PALS-installation

2015 ◽  
Vol 34 (1) ◽  
pp. 94-108 ◽  
Author(s):  
T. Pisarczyk ◽  
S.Yu. Gus'kov ◽  
O. Renner ◽  
R. Dudzak ◽  
J. Dostal ◽  
...  
Keyword(s):  
Shock Wave ◽  
Energy Transfer ◽  
Laser Beam ◽  
Laser Energy ◽  
Laser System ◽  
Radiation Energy ◽  
Point Of View ◽  
Main Beam ◽  
Appreciable Effect ◽  
Fast Electrons

AbstractThe paper is a continuation of research carried out at Prague Asterix Laser System (PALS) related to the shock ignition (SI) approach in inertial fusion, which was carried out with use of 1ω main laser beam as the main beam generating a shock wave. Two-layer targets were used, consisting of Cu massive planar target coated with a thin polyethylene layer, which, in the case of two-beam irradiation geometry, simulate conditions related to the SI scenario. The investigations presented in this paper are related to the use of 3ω to create ablation pressure for high-power shock wave generation. The interferometric studies of the ablative plasma expansion, complemented by measurements of crater volumes and Kα emission, clearly demonstrate the effect of changing the incident laser intensity due to changing the focal radius on efficiency of laser energy transfer to a shock wave and fast electron emission. The efficiency of the energy transfer increases with the radius of the focused laser beam. The pre-plasma does not significantly change the character of this effect. However, it unambiguously results in the increasing temperature of fast electrons, the total energy of which remains very small (<0.1% of the laser energy). This study shows that the optimal radius from the point of view of 3ω radiation energy transfer to the shock wave is the maximal one used in these experiments and equal to 200 µm that corresponds to the minimal effect of two-dimensional (2D)-expansion. Such a result is typical for the ablation process determined by electron conductivity energy transfer under the conditions of one-dimensional or 2D matter expansion without any appreciable effect due to energy transfer by fast electrons. The 2D simulations based on application of the ALANT-HE code and an analytical model that includes generation and transport of hot electrons has been used to support of experimental data.

TEA CO2 Laser-Induced Plasma with a Plane Shock Wave Structure

1993 ◽  
Vol 47 (10) ◽  
pp. 1562-1566 ◽  
Author(s):  
K. Kagawa ◽  
M. Tani ◽  
H. Ueda ◽  
M. Sasaki ◽  
K. Mizukami
Keyword(s):  
Shock Wave ◽  
Laser Beam ◽  
Laser Plasma ◽  
Wave Structure ◽  
Plane Shock Wave ◽  
Plane Shock ◽  
Plasma Confinement ◽  
Time Resolved ◽  
Wave Induced ◽  
Gas Pressures

A TEA CO2 laser beam (500 mJ, 100 ns) has been focused on a Zn target at reduced ambient gas pressures. In order to confine the laser plasma into a limited space, a tube (7 × 7 × 20 mm) has been placed just in front of the target, and the laser beam has been focused through the tube on the target. The time-resolved spatial distributions of Zn emission lines show that emission intensity increases quickly with a distinct jump near the front of the plasma and that the emissions take place only in a limited thin layer. It is also shown that the displacement of the emission front is proportional to 0.6 power of time. These experimental results support the supposition that the plasma is excited by a plane shock wave induced by the laser bombardment. This laser plasma confinement technique shows the possibility of improving the sensitivity in laser microprobe spectrochemical analysis.

scholarly journals Triple configurations of pursuit shock waves in conditions of ambiguity of the solution

2017 ◽  
pp. 46-52
Author(s):  
M. V. Chernyshov ◽  
A. S. Kapralova
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Supersonic Flows ◽  
Tangential Discontinuity ◽  
Oncoming Flow ◽  
Perfect Gas

The article studies triple configurations of shock waves in supersonic flows of a perfect gas in view of the fact that it is not always possible to determine unambiguously the parameters of the remaining shocks in the configuration by specifying the properties of the oncoming flow and the branching shock wave. The values of the parameters of triple configurations with maximum relations of the parameters of the flow on the sides of the outgoing tangential discontinuity (extremal configurations) in conditions of the ambiguity of the physically realizable solution are found analytically and numerically.

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