A nonlocal electron conduction model for multidimensional radiation hydrodynamics codes

Schurtz, G.; Nicolai, P.; Busquet, M.

doi:10.1063/1.1289512

Cited by 251 publications

(171 citation statements)

References 21 publications

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“…In principle, this distribution could be computed by taking into account the processes that supply the electron energy in the corona and sinks due to local dissipation and transport. Work on thermal conduction has been carried out in the context of the laboratory target preheating in laser-driven target implosions by Schurtz, Nicolai, and Busquet (2000) and references therein, and in the context of the solar wind by Bale et al (2013) and references therein. An in-depth discussion of the validity of the Spitzer conductivity flux-limiting approaches has been given by Catto and Grinneback (2000).…”

Section: Structure Of the Transition Region And Energy Balancementioning

confidence: 99%

Far- and Extreme-UV Solar Spectral Irradiance and Radiance from Simplified Atmospheric Physical Models

et al. 2013

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This article describes an update of the physical models that we use to reconstruct the FUV and EUV irradiance spectra and the radiance spectra of the features that at any given point in time may cover the solar disk depending on the state of solar activity. The present update introduces important modifications to the chromosphere-corona transition region of all models. Also, the update introduces improved and extended atomic data. By these changes, the agreement of the computed and observed spectra is largely improved in many EUV lines important for the modeling of the Earth's upper atmosphere. This article describes the improvements and shows detailed comparisons with EUV/FUV radiance and irradiance measurements. The solar spectral irradiance from these models at wavelengths longer than ≈ 200 nm is discussed in a separate article.

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Section: Structure Of the Transition Region And Energy Balancementioning

confidence: 99%

Far- and Extreme-UV Solar Spectral Irradiance and Radiance from Simplified Atmospheric Physical Models

et al. 2013

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“…A widely used alternative to the full VFP models is the reduced multi-group model proposed by Schurtz, Nicolaï and Busquet (the SNB model) [2]. Marrocchino et al have also compared the SNB model to a VFP model which retains higher order terms in the expanded distribution function [3].…”

Section: Introductionmentioning

confidence: 99%

A comparison of non-local electron transport models for laser-plasmas relevant to inertial confinement fusion

2017

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We compare the reduced non-local electron transport model developed by Schurtz et al. (Phys. Plasmas 7, 4238 (2000)) to Vlasov-Fokker-Planck simulations. Two new test cases are considered: the propagation of a heat wave through a high density region into a lower density gas, and a 1-dimensional hohlraum ablation problem. We nd the reduced model reproduces the peak heat ux well in the ablation region but signi cantly over-predicts the coronal preheat. The suitability of the reduced model for computing non-local transport e ects other than thermal conductivity is considered by comparing the computed distribution function to the Vlasov-Fokker-Planck distribution function. It is shown that even when the reduced model reproduces the correct heat ux, the distribution function is signi cantly di erent to the Vlasov-Fokker-Planck prediction. Two simple modi cations are considered which improve agreement between models in the coronal region.

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“…The waveforms are plotted in arbitrary units and show a reasonably good qualitative agreement between measurements and simulation results. By postprocessing FCI2 results with the diagnostic code DIXIM [11], we show that the multi-keV power primarily comes from two zones, one located near the target wall and directly heated by the laser spots, and an other one located along the cylinder axis and due to the plasma ablated from the wall. For each target, the two contributions to the total power ("wall" contributions and "axis" contributions) are delayed in time.…”

Section: Multi-kev Waveforms and Emission Zonesmentioning

confidence: 99%

Multi-keV X-ray sources from metal-lined cylindrical hohlraums

Jacquet

Girard

Villette

et al. 2013

EPJ Web of Conferences

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Abstract. In 2009 a series of metal-lined hohlraums were tested on the Omega laser facility. The main aims of the campaign were to improve our understanding of the multi-keV energy production and our capability to numerically reproduce the measured conversion efficiencies (CE's). Two studies have been primarily planned: the effect of the metallic plasma mean ionization states and that of hydrodynamics. Six targets were experimented for which the metallic materials (titanium, copper, germanium), the cavity diameter, and the irradiation energy were varied. Here we compare experimental and calculated results. The numerical simulations are performed with the 2D hydro-radiative code FCI2. For all the cavities, the measured multikeV x-ray powers versus time are qualitatively well reproduced by the simulations, indicating that hohlraum hydrodynamics seems to be well calculated. But we have an underestimation by a factor of ∼2 for the calculated CEs versus experimental values for titanium and copper hohlraums. By contrast there is a good agreement between measurements and calculations for the germanium hohlraum. To explain these results, we have calculated off-line integrated emissivities for couples of ( , Te) values contributing to the multi-keV production with several non-local-thermal-equilibrium (NLTE) atomic physics models.

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A nonlocal electron conduction model for multidimensional radiation hydrodynamics codes

Cited by 251 publications

References 21 publications

Far- and Extreme-UV Solar Spectral Irradiance and Radiance from Simplified Atmospheric Physical Models

Far- and Extreme-UV Solar Spectral Irradiance and Radiance from Simplified Atmospheric Physical Models

A comparison of non-local electron transport models for laser-plasmas relevant to inertial confinement fusion

Multi-keV X-ray sources from metal-lined cylindrical hohlraums

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