Measuring preheat in laser-drive aluminum using velocity interferometer system for any reflector: Experiment

Shu, Hua; Fu, Sizu; Huang, Xiang; Wu, Ji; Xie, Zhiyong; Zhang, Fan; Ye, Junjian; Guo, Jia; Zhou, Huazhen

doi:10.1063/1.4891429

Cited by 9 publications

(8 citation statements)

References 17 publications

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“…3% was obtained. The error of the spectral radiance has been analyzed according to Equation (9) in Section 3. The streak camera counts of calibrations of both lamps and the spectral radiance of a known lamp all contribute to the uncertainty.…”

Section: Multi-channel Methodsmentioning

confidence: 99%

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Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments

Zhang-Ming

Guo

Zhang

et al. 2019

High Pow Laser Sci Eng

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Although the streaked optical pyrometer (SOP) system has been widely adopted in shock temperature measurements, its reliability has always been of concern. Here, two calibrated Planckian radiators with different color temperatures were used to calibrate and verify the SOP system by comparing the two calibration standards using both multi-channel and single-channel methods. A high-color-temperature standard lamp and a multi-channel filter were specifically designed for the measurement system. To verify the reliability of the SOP system, the relative deviation between the measured data and the standard value of less than 5% was calibrated out, which demonstrates the reliability of the SOP system. Furthermore, a method to analyze the uncertainty and sensitivity of the SOP system is proposed. A series of laser-induced shock experiments were conducted at the ‘Shenguang-II’ laser facility to verify the reliability of the SOP system for temperature measurements at tens of thousands of kelvin. The measured temperature of the quartz in our experiments agreed fairly well with previous works, which serves as evidence for the reliability of the SOP system.

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Section: Multi-channel Methodsmentioning

confidence: 99%

“…Shock temperature measurements are among the important means to examine and test the theoretical EOS model under extreme conditions. High-power lasers have been increasingly used as drivers for shock-wave experiments, and can produce extremely high pressures [5][6][7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments

Zhang-Ming

Guo

Zhang

et al. 2019

High Pow Laser Sci Eng

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“…SOP is used for observation of self-emission of the target from which temperature can be extracted, whereas VISAR (660 nm) is applied for simultaneous diagnostics on free surface velocity and optical reflectivity. [24][25][26][27] A schematic illustrating these diagnostics is shown in Fig. 1 The target sample is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Shock temperature and reflectivity of precompressed H ₂ O up to 350 GPa: Approaching the interior of planets

Zhang-Ming¹,

Shu²,

Huang³

et al. 2018

Chinese Phys. B

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Using a combination of static precompression and laser-driven shock compression, shock temperature and reflectivity of H 2 O have been measured up to 350 GPa and 2.1×10 4 K. Here, two calibration standards were applied to enhance temperature measurement reliability. Additionally, in temperature calculations, the discrepancy in reflectivity between active probe beam wavelength and self-emission wavelength has been taken into account to improve the data's precision. Precompressed water's temperature-pressure data are in very good agreement with our quantum molecular dynamics model, suggesting a superionic conductor of H 2 O in the icy planets' deep interior. A sluggish slope gradually approaching Dulong-Petit limit at high temperature was found at a specific heat capacity. Also, high reflectivity and conductivity were observed at the same state. By analyzing the temperature-pressure diagram, reflectivity, conductivity and specific heat comprehensively at conditions simulating the interior of planets in this work, we found that as the pressure rises, a change in ionization appears; it is supposedly attributed to energetics of bond-breaking in the H 2 O as it transforms from a bonded molecular fluid to an ionic state. Such molecular dissociation in H 2 O is associated with the conducting transition because the dissociated hydrogen atoms contribute to electrical properties.

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“…This preheat can cause instability-like growth of structure at interfaces present in the system, which in turn alters the initial conditions and therefore complicates the analysis of processes that depend upon those initial conditions. Existing studies of preheat typically focus either on quantifying the amount of energy deposited [4][5][6][7] and/or the transport mechanism [3,8] involved. Studies considering the subsequent interface dynamics themselves have either been computational [9][10][11] or have involved complex structure tailored to a specific application [12].…”

Section: Introductionmentioning

confidence: 99%

“…The phenomenon of pre-heating of components, primarily due to X rays or energetic particles produced by laser/material interactions [1][2][3], has long been a known complication of laser-driven, high-energy-density (HED) systems. This preheat can cause instability-like growth of structure at interfaces present in the system, which in turn alters the initial conditions and therefore complicates the analysis of processes that depend upon those initial conditions.…”

Section: Introductionmentioning

confidence: 99%

Evolution of surface structure in laser-preheated perturbed materials

et al. 2017

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We report an experimental and computational study investigating the effects of laser preheat on the hydrodynamic behavior of a material layer. In particular, we find that perturbation of the surface of the layer results in a complex interaction, in which the bulk of the layer develops density, pressure, and temperature structure, and in which the surface experiences instability-like behavior, including mode coupling. A uniform one-temperature preheat model is used to reproduce the experimentallyobserved behavior, and we find that this model can be used to capture the evolution of the layer, while also providing evidence of complexities in the preheat behavior. This result has important consequences for inertially-confined fusion plasmas, which can be difficult to diagnose in detail, as well as for laser hydrodynamics experiments, which generally depend on assumptions about initial conditions in order to interpret their results.

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Measuring preheat in laser-drive aluminum using velocity interferometer system for any reflector: Experiment

Cited by 9 publications

References 17 publications

Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments

Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments

Shock temperature and reflectivity of precompressed H ₂ O up to 350 GPa: Approaching the interior of planets

Evolution of surface structure in laser-preheated perturbed materials

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Measuring preheat in laser-drive aluminum using velocity interferometer system for any reflector: Experiment

Cited by 9 publications

References 17 publications

Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments

Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments

Shock temperature and reflectivity of precompressed H 2 O up to 350 GPa: Approaching the interior of planets

Evolution of surface structure in laser-preheated perturbed materials

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Product

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Shock temperature and reflectivity of precompressed H ₂ O up to 350 GPa: Approaching the interior of planets