Comparison for non-local hydrodynamic thermal conduction models

Marocchino, A.; Tzoufras, M.; Atzeni, S.; Schiavi, A.; Nicolai, P.; Mallet, Jessy; Tikhonchuk, V. T.; Feugeas, J.‐L.

doi:10.1063/1.4789878

Cited by 56 publications

(34 citation statements)

References 26 publications

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“…DUED is a two-temperature Lagrangian fluid code for inertial fusion studies, it includes real matter equation of state, multigroup radiation and alpha-particle diffusion, fuel burn, three-dimensional laser ray-tracing, and inverse bremsstrahlung absorption. For electron thermal conduction DUED includes both the standard flux-limiter (sharp cutoff) technique as well as the non-local electron transport model by Schurtz-Nicolaï-Busquet [31] implemented in DUED as described in [29,30]. The original radiative hydrodynamic version used for ICF studies has been upgraded to include the dynamical evolution of magnetic fields in a magneto-hydrodynamical approximation.…”

Section: The Induction Equation and The Plasma Modelmentioning

confidence: 99%

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Magnetic field generation and diffusion by a laser-produced blast wave propagating in non-homogenous plasma

2015

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In this paper we discuss the magnetic field self generation, via the so-called Biermann battery effect, and its diffusion for a blast wave (BW) expanding in a perturbed background medium. A series of simulations verify the bi-linear behavior of the Biermann battery source term both in amplitude and in wavenumber. Such a behavior is valid in the limit of no diffusivity. When diffusivity is also considered, we observe an inverse proportionality with the wavenumber: for large wavenumber perturbation magnetic diffusivity plays a key role. Writing the induction equation in a dimensionless form we discuss how, in terms of magnetic properties, the BW can be subdivided into three main regions: the remnant where the frozen-in-flow approximation holds, the thin shell where the magnetic field is in fact generated but at the same time begins to diffuse, and the shock front where the magnetic field diffuses away. A possible experimental scenario that could induce magnetic fields of about 100 gauss is finally investigated. Simulations have been performed with the code DUED.

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Section: The Induction Equation and The Plasma Modelmentioning

confidence: 99%

“…The electron thermal conduction was modeled using both the standard flux-limiter technique and a NLET model [29][30][31]. Radiation transport is dealt with by a flux-limited multi-group diffusion scheme.…”

Section: The Induction Equation and The Plasma Modelmentioning

confidence: 99%

Magnetic field generation and diffusion by a laser-produced blast wave propagating in non-homogenous plasma

2015

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“…There are indications that fuel preheat in SI targets from nonlocal thermal electrons may be significant, 830 but these simulations should be treated with caution since the various nonlocal thermal conduction models exhibit very different levels of preheat. 615 The large standoff distance between the absorption region and the ablation surface improves the smoothing of laser nonuniformities. It also increases the ratio of surface area between the quarter-critical and ablation surfaces, which is expected to reduce hot-electron coupling to the target, particularly for less-directional hot-electron acceleration mechanisms such as the TPD instability (Sec.…”

Section: A One-dimensional Analysis and Simulationsmentioning

confidence: 99%

“…Marocchino et al 615 reviewed two nonlocal electron thermal conduction models, the SNB model and the CMG (Colombant-Manheimer-Goncharov) model, [616][617][618] and compared them with Vlasov-Fokker-Planck simulations. The CMG model is derived from first principles based on the BGK collision operator.…”

Section: -89mentioning

confidence: 99%

Direct-drive inertial confinement fusion: A review

et al. 2015

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The direct-drive, laser-based approach to inertial confinement fusion (ICF) is reviewed from its inception following the demonstration of the first laser to its implementation on the present generation of high-power lasers. The review focuses on the evolution of scientific understanding gained from target-physics experiments in many areas, identifying problems that were demonstrated and the solutions implemented. The review starts with the basic understanding of laser–plasma interactions that was obtained before the declassification of laser-induced compression in the early 1970s and continues with the compression experiments using infrared lasers in the late 1970s that produced thermonuclear neutrons. The problem of suprathermal electrons and the target preheat that they caused, associated with the infrared laser wavelength, led to lasers being built after 1980 to operate at shorter wavelengths, especially 0.35 μm—the third harmonic of the Nd:glass laser—and 0.248 μm (the KrF gas laser). The main physics areas relevant to direct drive are reviewed. The primary absorption mechanism at short wavelengths is classical inverse bremsstrahlung. Nonuniformities imprinted on the target by laser irradiation have been addressed by the development of a number of beam-smoothing techniques and imprint-mitigation strategies. The effects of hydrodynamic instabilities are mitigated by a combination of imprint reduction and target designs that minimize the instability growth rates. Several coronal plasma physics processes are reviewed. The two-plasmon–decay instability, stimulated Brillouin scattering (together with cross-beam energy transfer), and (possibly) stimulated Raman scattering are identified as potential concerns, placing constraints on the laser intensities used in target designs, while other processes (self-focusing and filamentation, the parametric decay instability, and magnetic fields), once considered important, are now of lesser concern for mainline direct-drive target concepts. Filamentation is largely suppressed by beam smoothing. Thermal transport modeling, important to the interpretation of experiments and to target design, has been found to be nonlocal in nature. Advances in shock timing and equation-of-state measurements relevant to direct-drive ICF are reported. Room-temperature implosions have provided an increased understanding of the importance of stability and uniformity. The evolution of cryogenic implosion capabilities, leading to an extensive series carried out on the 60-beam OMEGA laser [Boehly et al., Opt. Commun. 133, 495 (1997)], is reviewed together with major advances in cryogenic target formation. A polar-drive concept has been developed that will enable direct-drive–ignition experiments to be performed on the National Ignition Facility [Haynam et al., Appl. Opt. 46(16), 3276 (2007)]. The advantages offered by the alternative approaches of fast ignition and shock ignition and the issues associated with these concepts are described. The lessons learned from target-physics and implosion experiments are taken into account in ignition and high-gain target designs for laser wavelengths of 1/3 μm and 1/4 μm. Substantial advances in direct-drive inertial fusion reactor concepts are reviewed. Overall, the progress in scientific understanding over the past five decades has been enormous, to the point that inertial fusion energy using direct drive shows significant promise as a future environmentally attractive energy source.

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“…Because of the increasing mean free path with particle kinetic energy, the situation can already change for mean free path on the order of or longer than 1% of the length scale of plasma gradients [1]. This gives rise to kinetic effects such as streaming plasmas and non-local transport, which are intensely studied because of their importance in many plasma environments, such as high-density laser-produced plasmas [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and astrophysical plasmas like the solar wind [19], solar atmosphere [20,21], solar flares [22], and supernovae [23].…”

Section: Introductionmentioning

confidence: 99%

Emergence of kinetic behavior in streaming ultracold neutral plasmas

et al. 2015

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We create streaming ultracold neutral plasmas by tailoring the photoionizing laser beam that creates the plasma. By varying the electron temperature, we control the relative velocity of the streaming populations, and, in conjunction with variation of the plasma density, this controls the ion collisionality of the colliding streams. Laser-induced fluorescence is used to map the spatially resolved density and velocity distribution function for the ions. We identify the lack of local thermal equilibrium and distinct populations of interpenetrating, counter-streaming ions as signatures of kinetic behavior. Experimental data is compared with results from a one-dimensional, two-fluid numerical simulation.

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Comparison for non-local hydrodynamic thermal conduction models

Cited by 56 publications

References 26 publications

Magnetic field generation and diffusion by a laser-produced blast wave propagating in non-homogenous plasma

Magnetic field generation and diffusion by a laser-produced blast wave propagating in non-homogenous plasma

Direct-drive inertial confinement fusion: A review

Emergence of kinetic behavior in streaming ultracold neutral plasmas

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