Abstract
This article studies the propagation of supersonic radiative Marshak waves. These waves are radiation dominated, and play an important role in inertial confinement fusion and in astrophysical and laboratory systems. For that reason, this phenomenon has attracted considerable experimental attention in recent decades in several different facilities. The present study integrates the various experimental results published in the literature, demonstrating a common physical base. A new simple semi-analytic model is derived and presented along with advanced radiative hydrodynamic implicit Monte Carlo direct numerical simulations, which explain the experimental results. This study identifies the main physical effects dominating the experiments, notwithstanding their different apparatuses and different physical regimes.
Highlights
Radiative heat (Marshak) waves play an important role in many high-energy density physics phenomena, such as inertial confinement fusion (ICF) and astrophysical and laboratory plasmas [1,2]
Several experiments using supersonic Marshak waves propagating through low-density foams have been performed and reported
We present a simple semianalytic model which takes into account the main physical aspects of the problem
Summary
Radiative heat (Marshak) waves play an important role in many high-energy density physics phenomena, such as inertial confinement fusion (ICF) and astrophysical and laboratory plasmas [1,2]. Several experiments using supersonic Marshak waves propagating through low-density foams have been performed and reported These experiments facilitating high-energy lasers typically use hohlraums as a drive energy generator [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. We use exact 2D IMC, coupled to hydrodynamics simulations, in order to attain a detailed reconstruction of the experiments These two building blocks enable a comprehensive understanding of the physical mechanisms dominating this type of experiment. The model is fully derived, including all the main physical procedures Both the model and the exact simulations are examined against all the experimental results. As will be discussed further below, we demonstrate that the different experiments were carried out with diverse apparatuses, diagnostics, and target fabrication methods, they share several features, and the main physics governing the system is very similar
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