New experimental possibilities for measuring radiative opacity under conditions in the Sun's interior

Rose, S. J.

doi:10.1088/0741-3335/47/12b/s55

Cited by 20 publications

(11 citation statements)

References 21 publications

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“…The weak coupling approximation yields the factorization ρ = ρ A ρ R in the second term of the right-hand side with ρ A = Tr R (ρ). Equation (5) can be written in a form similar to the Lindblad equation, by using techniques involved in the theory of open quantum systems [50]. We expand the commutator and write it as a quadratic function of the creation and annihilation operators.…”

Section: Master Equation For the Photonsmentioning

confidence: 99%

“…Algebraic manipulations with Eqs. (5) and (6) yield an equation of Lindblad-type for the density operator ρ R :…”

Section: Master Equation For the Photonsmentioning

confidence: 99%

“…Opacity models for radiative transfer are widely used in highenergy density physics, in astrophysics (e.g. in the core of stars) but also in the framework of fusion research, e.g., to characterize the warm and hot dense matter present in imploding inertial confinement capsules [3][4][5][6][7]. Another important application of opacity models is provided by spectroscopic diagnostics and radiation transport simulations in magnetic fusion, in particular with the preparation of ITER (currently under construction in France) and the development of integrated modeling codes supporting its operation [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Radiative transfer with partial coherence in optically thick plasmas

Rosato

2013

Phys. Rev. E

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A quantum transport model for atomic line radiation in plasmas is developed and analyzed. It is found that the Wigner phase space formulation of QED provides a consistent way to address the wave-particle duality in radiative transfer problems. If the photons' thermal de Broglie length is much smaller than all of the spatial scales of the problem under consideration (large-spectral-band limit), the radiation is not coherent and radiative transfer can be addressed with the usual treatments. In the general case, the Heisenberg uncertainty relation yields ambiguities in the description of the radiation-matter interaction mechanisms. We examine this issue and show that an accurate description of radiative transfer should involve a model with nonlocal interactions and requires an appropriate coarse-graining procedure. Calculations of transmission factors and absorption spectra in ideal cases are performed and indicate that significant misinterpretations can be made in spectroscopic diagnostics if the radiation coherence is not well accounted for. Applications to laser physics are also discussed.

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Section: Master Equation For the Photonsmentioning

confidence: 99%

“…Algebraic manipulations with Eqs. (5) and (6) yield an equation of Lindblad-type for the density operator ρ R :…”

Section: Master Equation For the Photonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiative transfer with partial coherence in optically thick plasmas

Rosato

2013

Phys. Rev. E

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“…xtreme material conditions, such as super-high density and warm or hot temperatures, can be widely found in the universe. For example, brown-dwarf cores and white dwarfs [1][2][3] can have a mass density of ρ = 10 3 -10 7 g cm −3 and temperatures up to~10 6 K. Thanks to technological advancements, such extreme states of matter can now be created in the laboratory using powerful lasers [4][5][6][7] and/or pulsed-power machines 8 . For instance, deuterium and tritium contained in a millimeter-size inertial confinement fusion (ICF) target can be squeezed to ρ = 10 2 -10 3 g cm −3 by powerful lasers through laserdriven compression and spherical convergence [9][10][11][12][13] .…”

mentioning

confidence: 99%

Interspecies radiative transition in warm and superdense plasma mixtures

Karasiev

Recoules

et al. 2020

Nat Commun

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Superdense plasmas widely exist in planetary interiors and astrophysical objects such as brown-dwarf cores and white dwarfs. How atoms behave under such extreme-density conditions is not yet well understood, even in single-species plasmas. Here, we apply thermal density functional theory to investigate the radiation spectra of superdense iron-zinc plasma mixtures at mass densities of ρ = 250 to 2000 g cm −3 and temperatures of kT = 50 to 100 eV, accessible by double-shell-target implosions. Our ab initio calculations reveal two extreme atomic-physics phenomena-firstly, an interspecies radiative transition; and, secondly, the breaking down of the dipole-selection rule for radiative transitions in isolated atoms. Our first-principles calculations predict that for superdense plasma mixtures, both interatomic radiative transitions and dipole-forbidden transitions can become comparable to the normal intra-atomic Kα-emission signal. These physics phenomena were not previously considered in detail for extreme high-density plasma mixtures at super-high energy densities.

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“…Electron-impact ionization processes of atoms and ions embedded in hot dense plasma are of interest both for fundamental science and for practical applications in the interiors of stars, white dwarfs, and neutron stars [1,2], for inertial-confinement fusion [3,4], and for high-energydensity plasmas [5,6]. They determine the charge-state distribution and power balance and can also be used to infer the plasma conditions of electron temperature and electron density [7][8][9].…”

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confidence: 99%

Strong enhancement of electron-impact-ionization processes in hot dense plasma by transient spatial localization

Zeng

Liu

Gao

et al. 2020

Preprint

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The current standard atomic collision theory cannot explain recent experiments on electron-ion collisional ionization processes in hot dense plasma. We suggest that the use of (distorted) plane waves for incident and scattered electrons is not adequate to describe dissipation during the ionization event. Random collisions with free electrons and ions in plasma cause electron matter waves to lose their phase, which results in partial decoherence of incident and scattered electrons. Such a plasma-induced transient spatial localization of the continuum-electron states signiﬁcantly modiﬁes the wave functions of continuum electrons, resulting in a strong enhancement of electron-ion collisional ionization of ions in plasma compared with isolated ions. We develop a theoretical formulation to calculate the diﬀerential and integral cross sections by incorporating the eﬀects of plasma screening and transient spatial localization. The approach is then used to investigate electron-impact ionization of ions in solid-density magnesium plasma and gives results that are consistent with experiment. The correlation of continuum-electron energies is modiﬁed and the integral cross sections and rates increase considerably in hot dense plasma. For ionization of Mg9+ e+ 1s2 2s 2S → 1s2 1S + 2e, the ionization cross sections increase several-fold and the rates increase by one order of magnitude. Our ﬁndings shed new insight on collisional ionization and three-body recombination and should aid in investigations of the transport properties and nonequilibrium evolution of hot dense plasma.

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New experimental possibilities for measuring radiative opacity under conditions in the Sun's interior

Cited by 20 publications

References 21 publications

Radiative transfer with partial coherence in optically thick plasmas

Radiative transfer with partial coherence in optically thick plasmas

Interspecies radiative transition in warm and superdense plasma mixtures

Strong enhancement of electron-impact-ionization processes in hot dense plasma by transient spatial localization

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