Abstract
Lithium fluoride (LiF) windows are extensively used in traditional shock wave experiments because of their transparency beyond 100 GPa along (100) axis. A cor- rect knowledge of the optical and mechanical properties of these windows is essential in order to analyze the experimental data and to determine the equation of state on a large variety of metals. This in mind, the windows supply is systematically characterized in order to determine the density, the thermal expansion and the crystalline orientation. Fur- thermore, an experimental campaign is conducted in order to characterize the windows properties under shock loading at 300 K and preheated conditions (450 K). This article describes the experiments, details the analysis and presents the results. Particle velocity measurements are carried out at the interface of a multiple windows stack using inter- ferometer diagnostic (VISAR and IDL) at 532 nm wavelength. Shock velocity is calcu- lated as a function of the time of flight through each window. The optical correction is calculated as the ratio of the apparent velocity gap and the particle velocity at the free surface. To go further, the Rankine-Hugoniot relations are applied to calculate the pres- sure and the density. Then, the results and uncertainties are presented and compared with literature data.
Highlights
Lithium fluoride (LiF) windows are extensively used in traditional shock wave experiments because of their transparency beyond 100 GPa along [100] axis
Traditional shock wave experiments need windows to characterize a variety of materials
The refractive index is calculated from the relations (2) and (6)
Summary
Lithium fluoride (LiF) windows are extensively used in traditional shock wave experiments because of their transparency beyond 100 GPa along [100] axis. A correct knowledge of the optical and mechanical properties of these windows is essential in order to analyze the experimental data and to determine the equation of state on a large variety of metals. This in mind, the windows supply is systematically characterized in order to determine the density, the thermal expansion and the crystalline orientation. In order to analyse and simulate the experiments it is necessary to have a good knowledge of the optical and mechanical properties of these LiF windows This in mind it is necessary to characterize our windows supply: density, crystalline orientation, acoustic velocity and dimensional measurements. A campaign is conducted in order to characterize the behaviour under dynamic loading in particular at 450 K which is the selected temperature level for some of our preheated experiments [1]
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