Radiative and atomic properties of C and CH plasmas in the warm-dense-matter regime

Lee, T.-G.; Busquet, M.; Klapisch, M.; Bates, Jason W.; Schmitt, A. J.; Hu, S. X.; Giuliani, J. L.

doi:10.1103/physreve.98.043203

Cited by 6 publications

(4 citation statements)

References 71 publications

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“…We assessed the quality of our STA calculations by comparing them with other available theoretical calculations as well as experimental data. The STA calculated emissivities, opacities and average ionization for carbon and plastic CH were found to be in good agreement with other theoretical results and experimental data [16]. The STA method was designed to analyze unresolved spectra of hot, high-Z plasma in LTE.…”

Section: Introductionsupporting

confidence: 74%

Super-transition-array calculations for synthetic spectra and opacity of high-density, high-temperature germanium plasmas

Lee¹,

Jarrah²,

Benredjem³

et al. 2020

High Energy Density Physics

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The synthetic emission spectra and opacity of high-density, high-temperature germanium (Z=32) plasma from super-transition-array (STA) calculations are presented. The viability of the STA model, which is based on a statistical superconfigurations accounting approach for calculating the atomic and radiative properties, is examined by comparing and contrasting its results against the available experimental data and other theoretical calculations. First, we focus on the emission data.To model the data, the Eulerian radiation-hydrodynamics code FastRad3D is used in conjunction with STA to obtain the STA-required inputs, namely, the time-dependent temperature and density profiles of the Ge plasmas. Consequently, we find that STA results fit the experimental spectrum reasonably well, reproducing the main spectral features of 2p − 3d, 2s − 3p, and 2p − 4d transitions from the laser-heated germanium layer buried in plastic [High Energy Density Phys., 6 (2010) 105]. However, careful comparison between experimental and theoretical results in the photonenergy regions of ∼1.7 keV shows some degrees of disparity between the two. This may be due to the non-LTE effects and the presence of spatial gradients in the sample. Limitations of STA to model the experimental spectrum precisely is expected and underscoring the difficulty of the present attempts as the model assumed local thermodynamics equilibrium population dynamics.Second, we examine the STA calculated multi-frequency opacities for a broad range of Ge plasma conditions covering the L-and M-shell spectral range. Comparing with a hybrid LTE opacity code which combines the statistical super-transition-array and fine-structure methods [High Energy Density Phys., 7 (2011) 234], impressively good agreement is found between the two calculations. In addition, the sensitivity of the opacity results in various plasma temperatures and mass densities is discussed. The ionized population fraction and average ionization of the Ge plasma are also described. Comparisons of STA results in the observed spectrum and opacity are considerably close while offering the advantage of computational speed and its capability of treating hot and dense high-Z plasmas.

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Section: Introductionsupporting

confidence: 74%

Super-transition-array calculations for synthetic spectra and opacity of high-density, high-temperature germanium plasmas

Lee¹,

Jarrah²,

Benredjem³

et al. 2020

High Energy Density Physics

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“…This form of TUR holds for most of biological processes that can be represented either by stochastic jump processes on a kinetic network or by overdamped Langevin dynamics [23][24][25][26], though extensions to more general conditions, which adjust the lower bound of the original relation, have also been discussed in recent years [14,[27][28][29][30][31][32][33][34]. Briefly,…”

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confidence: 99%

Thermodynamic Cost, Speed, Fluctuations, and Error Reduction of Biological Copy Machines

Song

Hyeon

2020

J. Phys. Chem. Lett.

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Due to large fluctuations in cellular environments, transfer of information in biological processes without regulation is inherently error-prone. The mechanistic details of error-reducing mechanisms in biological copying processes have been a subject of active research; however, how error reduction of a process is balanced with its thermodynamic cost and dynamical properties remain largely unexplored. Here, we study the error reducing strategies in light of the recently discovered thermodynamic uncertainty relation (TUR) that sets a physical bound to the cost-precision trade-off relevant in general dissipative processes. We found that the two representative copying processes, DNA replication by the exonuclease-deficient T7 DNA polymerase and mRNA translation by the E. coli ribosome, reduce the error rates to biologically acceptable levels while also optimizing the processes close to the physical limit dictated by TUR.

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“…Using More's fit of the Thomas-Fermi finite temperature average ionization [26,27], and starting from a 1 = a 2 = • • • = a, the solution is quickly reached in a few iterations. This iso-n e assumption is well known in the opacity community [28].…”

Section: A the Iso-electronic Assumptionmentioning

confidence: 91%

Static and dynamic properties of multi-ionic plasma mixtures

et al. 2020

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Complex plasma mixtures with three or more components are often encountered in astrophysics or in inertial confinement fusion (ICF) experiments. For mixtures containing species with large differences in atomic number Z, the modeling needs to consider at the same time the kinetic theory for low-Z elements combined with the theory of strongly coupled plasma for high-Z elements, as well as all the intermediate situations that can appear in multi-component systems. For such cases, we study the pair distribution functions, self-diffusions, mutual diffusion and viscosity for ternary mixtures at extreme conditions. These quantities can be produced from first principles using orbital free molecular dynamics at the computational expense of very intensive simulations to reach good statistics. Utilizing the first-principles results as reference data, we assess the merit of a global analytic model for transport coefficients, "Pseudo-Ions in Jellium" (PIJ), based on an iso-electronic assumption ( iso-ne). With a multi-component hypernetted-chain integral equation, we verify the quality of the iso-ne prescription for describing the static structure of the mixtures. This semi-analytical modeling compares well with the simulation results and allows one to consider plasma mixtures not accessible to simulations. Applications are given for the mix of materials in ICF experiments. A reduction of a multicomponent mixture to an effective binary mixture is also established in the hydrodynamic limit and compared with PIJ estimations for ICF relevant mixtures.

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Radiative and atomic properties of C and CH plasmas in the warm-dense-matter regime

Cited by 6 publications

References 71 publications

Super-transition-array calculations for synthetic spectra and opacity of high-density, high-temperature germanium plasmas

Super-transition-array calculations for synthetic spectra and opacity of high-density, high-temperature germanium plasmas

Thermodynamic Cost, Speed, Fluctuations, and Error Reduction of Biological Copy Machines

Static and dynamic properties of multi-ionic plasma mixtures

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