Supersonic radiative heat waves in low-density high-<i>Z</i>material

Massen, J.; Tsakiris, George D.; Eidmann, K.; Földeş, I; Löwer, Th.; Sigel, R.; Witkowski, S.; Nishimura, Hiroaki; Endo, Tamio; Shiraga, H.; Takagi, Masaru; Kato, Yoshiaki; Nakai, S.

doi:10.1103/physreve.50.5130

Cited by 49 publications

(28 citation statements)

References 13 publications

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“…1 compares the experiments discussed in this work with previously published similar experiments by Back et al, 3,4 Gregori et al, 7 and Massen et al 8 The experiments discussed in this work initially have parameters s % 3.5 and M rad % 12 (very supersonic and fairly diffusive). As the radiation wave continues to propagate through the plasma, its diffusivity increases whilst its speed decreases, eventually traversing the entire plasma with final parameters of s % 5.5 and M rad % 2 (a weakly supersonic and very diffusive state).…”

Section: Introductionmentioning

confidence: 66%

“…29 and 30. Such involved and rigorous statistical assessments are rarely made in high energy-density (HED) experiments (Gaffney et al 31,32 being recent notable exceptions); this work quantifies uncertainties to a higher degree than is standard in the field of radiation wave propagation, such as Afshar-Rad et al, 9 Back et al, 3,4 Bozier et al, 10 Gregori et al, 7 Hoarty et al, 11,12 Massen et al, 8 and Willi et al 13 Furthermore, this work assesses the probability that data can be described sufficiently by the named models.…”

Section: Appendix: the Statistical Consistency Of A Datasetmentioning

confidence: 97%

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Quantifying equation-of-state and opacity errors using integrated supersonic diffusive radiation flow experiments on the National Ignition Facility

et al. 2015

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A well diagnosed campaign of supersonic, diffusive radiation flow experiments has been fielded on the National Ignition Facility. These experiments have used the accurate measurements of delivered laser energy and foam density to enable an investigation into SESAME's tabulated equation-of-state values and CASSANDRA's predicted opacity values for the low-density C8H7Cl foam used throughout the campaign. We report that the results from initial simulations under-predicted the arrival time of the radiation wave through the foam by ≈22%. A simulation study was conducted that artificially scaled the equation-of-state and opacity with the intended aim of quantifying the systematic offsets in both CASSANDRA and SESAME. Two separate hypotheses which describe these errors have been tested using the entire ensemble of data, with one being supported by these data.

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Section: Introductionmentioning

confidence: 66%

Section: Appendix: the Statistical Consistency Of A Datasetmentioning

confidence: 97%

Quantifying equation-of-state and opacity errors using integrated supersonic diffusive radiation flow experiments on the National Ignition Facility

et al. 2015

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“…Low-density material foam~Basko & Meyer-ter-Vehn, 1993; Borisenko et al, 2003;Philippe et al, 2004! has come to play an important role as an efficient converter and hence, many experiments were done on supersonic heat wave propagation in foam Afshar-rad et al, 1994;Massen et al, 1994;Back et al, 2000aBack et al, , 2000b!. Usually, it was assumed that the photons begin to thermalize at about one optical depth, that is, the emission is isotropic and the spectrum is in planckian distribution, so the diffusive approximation begins to be applicable.…”

Section: Introductionmentioning

confidence: 99%

Study on two-dimensional transfer of radiative heating wave

et al. 2005

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A two-dimensional~2D! multigroup radiation transfer hydrodynamics code LARED-R-1 is used to simulate a supersonic wave experiment performed earlier by the Livermore group. The main result is that, contrary to the conclusion of Back et al.~2000a!, the average-atom opacity model is sufficient to explain the obtained experimental results, provided that an adequate description of the radiation transport was used. The simulation results from LARED-R-1 show the spectrum of radiation in foam with radius and length of several optical depths is not in Planckian distribution and the angular intensity distribution is anisotropic.

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“…Recently, some laboratories have observed propagation of thermal radiation in optically thick and thin sample [1][2][3][4][5][6][7][8][9][10]. The diffusive and supersonic x-ray transport in the radiatively heated foam was detailedly measured [2][3][4][5][6][7]. Although the transport delay time of a certain photon group with in thermal radiation has been investigated [4,5], the transport velocities of the photon groups with different energies in foam are different, because their opacities vary with photon energy.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of diffusive supersonic radiation propagation in low density CH foam doped with Cu

et al. 2004

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Eight beams of 0.35 mm laser with pulse duration of 1ns and 2 kJ of total energy enter into a hohlraum to create intense x-ray radiation on the Shenguang II laser facility. The plastic foam doped with 59 nanometers of Cu granule (C 6 H 12 Cu 0.394 ) at a low density of 50 mg/cm 3 is heated by x-ray radiation emitted from the hohlraum. The breakout time of the radiation wave is measured by a three chromatic streaked x-ray spectrometer (TCS) that consists of a set of three imaging pinholes and an array of three transmission gratings coupled with an x-ray streak camera (XSC). At one shot, the simultaneous measurements of the drive source and the radiation transport at two energies (210 eV, 840 eV) through the foam have been made for the first time. The experimental results indicate that the time delays vary with photon energies. The radiation at energy 210 eV propagates at a lower velocity. Using TGS, the transmitting spectrum was measured, and the lower limit of the optical depth, which is more than 1, was obtained. The Mach number of the radiation wave is about 4. The radiation transport in the foam doped with Cu is diffusively supersonic and the diffusion approximation begins to be applicable. The experimental data were compared with the simulation of two-dimensional radiation hydrodynamics code and they reasonably agree.PACS: 52.50.Jm, 52.25.Nr

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Supersonic radiative heat waves in low-density high-Zmaterial

Cited by 49 publications

References 13 publications

Quantifying equation-of-state and opacity errors using integrated supersonic diffusive radiation flow experiments on the National Ignition Facility

Quantifying equation-of-state and opacity errors using integrated supersonic diffusive radiation flow experiments on the National Ignition Facility

Study on two-dimensional transfer of radiative heating wave

Experimental investigation of diffusive supersonic radiation propagation in low density CH foam doped with Cu

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