Equations of State and the ellipsometry diagnostics

Bakshi, L.; Eliezer, S.; Henis, Z.; Nissim, Noaz; Perelmutter, L.; Moreno, D.; Sudai, M.; Mond, M.

doi:10.1017/s0263034609000111

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…In order to achieve a better understanding of the response of materials to extreme conditions, such as those existing in the interior of large planetary bodies or in hypervelocity impact among planetary materials, as well as in the case of inertial confinement fusion, it is essential to have knowledge of the equation of state (EOS) of the involved materials at the appropriate thermodynamic conditions (Bakshi et al, 2009;Eliezer et al, 2002). To be able to describe such physical events at a verity of different conditions, the entire pressure-temperature-volume range between the cold isotherm and principal Hugoniot must be considered.…”

Section: Introductionmentioning

confidence: 99%

Approaching the “cold curve” in laser-driven shock wave experiment of a matter precompressed by a partially perforated diamond anvil

Nissim¹,

Eliezer²,

Werdiger³

et al. 2012

Laser Part. Beams

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This paper suggests a novel route to approach the cold compression curve in laser-plasma induced shock waves. This effect is achieved with a precompression in a diamond anvil cell (DAC). In order to keep the necessary structure of one dimensional shock wave it is required to use a diamond anvil cell with a partially perforated diamond anvil. Precompression pressures of about 50 GPa, that are an order of magnitude higher than the currently reported pressures, are possible to obtain with presentley existing diamond anvil cell technology. The precompressed Hugoniot of Al was calculated for different precompression pressures and it was found that at precompression pressure of 50 GPa the Hugoniot follows the "cold curve" up to about 2 Mbar and 5.2 g/cc. Furthermore, the thermal relative contribution on the Hugoniot curves is calculated.

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Section: Introductionmentioning

confidence: 99%

Approaching the “cold curve” in laser-driven shock wave experiment of a matter precompressed by a partially perforated diamond anvil

Nissim¹,

Eliezer²,

Werdiger³

et al. 2012

Laser Part. Beams

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“…Knowing the spectral dependence of the index of refraction of a material can give insight on the interband transition energies and transitions probabilities, the charge carriers' mean free path, density and effective mass. 9 An important experimental issue for optical measurements at high (P,T) using a DAC is the knowledge of the emissivity of the diamond-sample interface. optical properties of matter can be used to detect pressureinduced phase transitions.…”

Section: Introductionmentioning

confidence: 99%

High pressure ellipsometry: A novel method for measuring the optical properties and electronic structure of materials in diamond anvil cells

Nissim

Eliezer²,

Bakshi³

et al. 2011

Review of Scientific Instruments

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High pressure ellipsometry (HPE) method was developed for determining the index of refraction of opaque materials in a diamond anvil cell (DAC). A main difficulty in DAC-based HPE, namely, the pressure-induced birefringence developed in the diamond, was overcome enabling the extraction of the ellipsometric parameters of the sample. The method used was based on the fact that an unpolarized light is unaffected by a retarding optical element and thus reduces the number of unknown parameters in the problem. Because of technical difficulties in using unpolarized light, a linear combination of orthogonal polarizations was applied. In the experimental procedure, multiangle measurements of the ellipsometric parameter ψ are collected at each pressure and the data is fitted together with a measurement of the near normal reflectivity, in order to extract the complex index of refraction. As a test case, this procedure was used to measure the high pressure index of refraction of iron up to 30 GPa for light with wavelengths of 532 and 633 nm. From the index of refraction as a function of pressure the diamond-iron interface emissivity for different pressures was derived and from which the phase transition α → ε could be identified and characterized. The emissivity increases with pressure both at the α (0-9 GPa) and the ε phase (21-30 GPa) however decreases at the mixed α - ε (9-21 GPa) range. From the imaginary part of the index of refraction the pressure dependence of the energy skin depth of iron was extracted. It was found that the energy skin depth increases by an order of magnitude at 30 GPa relative to ambient conditions.

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“…Most prominent are shock wave experiments (McQueen et al, 1983;Neal, 1976;Collins et al, 2001;Knudson et al, 2003;Fortov et al, 2007) but other techniques can explore different regions in phase space (see, e.g., Weir et al, 1959;Jayarama, 1986;Bakshi et al, 2009). Quasi-isentropic compression using ramp wave loading (RWL) (Reisman et al, 2000;Hayes, 2001;Cauble et al, 2002;Hayes et al, 2004;Rothman et al, 2005;Davis, 2006;Chhabildas & Barker, 1986;Barnes et al, 1974;Lorenz et al, 2004Lorenz et al, , 2005Smith et al, 2007;Swift & Johnson, 2005) allows sampling EOS data along an isentrope up to several Mbar pressures, located on the phase diagram between the parameter regions accessible with diamond anvil cells (Weir et al, 1959;Jarayama, 1986) and shock wave experiments (McQueen et al, 1983;Neal, 1976).…”

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confidence: 99%

Ramp wave loading experiments driven by heavy ion beams: A feasibility study

2009

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A new design for heavy-ion beam driven ramp wave loading experiments is suggested and analyzed. The proposed setup utilizes the long stopping ranges and the variable focal spot geometry of the high-energy uranium beams available at the GSI Helmholtzzentrum für Schwerionenforschung and Facility for Antiproton and Ion Research accelerator centers in Darmstadt, Germany. The release wave created by ion beams can be utilized to create a planar ramp loading of various samples. In such experiments, the predicted high pressure amplitudes (up to 10 Mbar) and short timescales of compression (,10 ns) will allow to test the time-dependent material deformation at unprecedented extreme conditions.

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Equations of State and the ellipsometry diagnostics

Cited by 4 publications

References 24 publications

Approaching the “cold curve” in laser-driven shock wave experiment of a matter precompressed by a partially perforated diamond anvil

Approaching the “cold curve” in laser-driven shock wave experiment of a matter precompressed by a partially perforated diamond anvil

High pressure ellipsometry: A novel method for measuring the optical properties and electronic structure of materials in diamond anvil cells

Ramp wave loading experiments driven by heavy ion beams: A feasibility study

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