The fast non-LTE code DEDALE

Gilleron, F.; Piron, R.

doi:10.1016/j.hedp.2015.07.001

Cited by 15 publications

(6 citation statements)

References 36 publications

(32 reference statements)

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“…In this paper, the energy level population and charge state distribution in plasmas are calculated by a steady-state CR model including 12 atomic processes based on screened-hydrogenic approximation [36,37]. Under the steady-state approximation, the CR model needs to establish and solve the following rate equations…”

Section: Cr Modelmentioning

confidence: 99%

Two-dimensional axisymmetric radiation hydrodynamics model of moderate-intensity nanosecond laser-produced plasmas

Qin¹,

Shen²,

Su³

et al. 2022

J. Phys. D: Appl. Phys.

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A two-dimensional axisymmetric radiation hydrodynamics model has been proposed to simulate nanosecond laser ablation of a solid target in ambient argon, air and helium at different pressures. The heat conduction equation used to simulate the conduction of laser deposition energy in the target and gas dynamic equations to describe the interaction between laser and vapor plasma and the evolution of plasma are coupled through the Knudsen layer relations at the target-vapor interface. A collisional-radiative model including 12 atomic processes is used to calculate the population of atomic energy levels and fractional ion abundance. The internal energy and pressure of the plasma are expressed by the equations of state based on a real gas approximation, which divides the internal energy into the ionization energy, thermal energy, and excitation energy of atoms and ions. The distributions of the temperature, pressure, density and velocity of the target and plasma are calculated by using this model, and the results are analyzed. Experimental results of multiple diagnostic tools including fast photography, shadowgraphy images, spatio-temporally resolved optical emission spectroscopy and laser interferometry, are used to benchmark the simulation results, and satisfactory consistencies are obtained. The model provides a numerical tool to interpret experimental data of a moderate-intensity nanosecond laser ablated solid target when the temperature of the target surface does not reach the critical value.

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Section: Cr Modelmentioning

confidence: 99%

Two-dimensional axisymmetric radiation hydrodynamics model of moderate-intensity nanosecond laser-produced plasmas

Qin¹,

Shen²,

Su³

et al. 2022

J. Phys. D: Appl. Phys.

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“…A stationary collisional-radiative (CR) model, SAPHyR, has been used to calculate the spectral intensity of non-LTE Mn plasma. Following references 10,17,43 , the atomic structure is described in term of superconfiguration (SC) defined by an integer filling of shells, here characterized by principal quantum numbers.…”

Section: Electron Temperature Versus Line Ratios Inferred From a Dot Mixed With Ablatormentioning

confidence: 99%

Rayleigh–Taylor mixing may account for the position anomaly in NIF microdot spectroscopy experiments

et al. 2021

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The “microdot spectroscopy” experiment [Barrios et al., “Electron temperature measurements inside the ablating plasma of gas-filled Hohlraums at the National Ignition Facility,” Phys. Plasmas 23, 056307 (2016); Barrios et al., “Developing an experimental basis for understanding transport in NIF Hohlraum plasmas,” Phys. Rev. Lett. 121, 095002 (2018).] allows for a simultaneous measurement of the electron temperature (Te) and position of a patch of Mn and Co inside a Hohlraum, as described by Barrios et al. [“Electron temperature measurements inside the ablating plasma of gas-filled Hohlraums at the National Ignition Facility,” Phys. Plasmas 23, 056307 (2016).] HYDRA simulations systematically predicted a dot location further away from its starting location than observed in the experiment. In the article, integrated radiation hydrodynamics simulations with TROLL have led to the same trend as HYDRA. A new ad hoc treatment of laser absorption, through what we have called absorption multipliers, has been implemented in TROLL in order to mimic the effect of absorption mechanisms other than inverse-bremsstrahlung. It led to the instrumental conclusion that whatever physical phenomenon was responsible for the position anomaly must have occurred in the early stage. More precise simulations of the dot region, from early to late time, show that the position discrepancy can be explained by a Rayleigh–Taylor mixing of the dot into the ablator as it expands in the Hohlraum. This mixing tends to shift the simulated dot closer to the location measured in the experiment. However, the mixing also changes the interpretation of the electron temperature from the spectral line ratios.

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“…The color map corresponds to the effect of dielectronic processes on the mean ionization. Calculations for this figure were done with the DEDALE code [26].…”

Section: Codementioning

confidence: 99%

“…Due to the theoretical and practical complexity of some approaches, only a few of them are actually used in NLTE modeling and one often resorts to the simplest heuristic approaches. Among the codes, the impact of density on the atomic shell structure is accounted for in quite different ways, ranging from rather involved models such as the quasizone model [39] to purely heuristic degeneracy reduction [26,64], or even a simple rule of thumb for the limitation of the maximum principal quantum number. Fig.…”

Section: Ne = 10 24 CM −3 Casementioning

confidence: 99%

Review of the 9th NLTE code comparison workshop

Piron¹,

Gilleron²,

Aglitskiy³

et al. 2017

High Energy Density Physics

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We review the 9th NLTE code comparison workshop, which was held in the Jussieu campus, Paris, from November 30th to December 4th, 2015. This time, the workshop was mainly focused on a systematic investigation of iron NLTE steady-state kinetics and emissivity, over a broad range of temperature and density. Through these comparisons, topics such as modeling of the dielectronic processes, density effects or the effect of an external radiation field were addressed. The K-shell spectroscopy of iron plasmas was also addressed, notably through the interpretation of tokamak and laser experimental spectra.

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The fast non-LTE code DEDALE

Cited by 15 publications

References 36 publications

Two-dimensional axisymmetric radiation hydrodynamics model of moderate-intensity nanosecond laser-produced plasmas

Two-dimensional axisymmetric radiation hydrodynamics model of moderate-intensity nanosecond laser-produced plasmas

Rayleigh–Taylor mixing may account for the position anomaly in NIF microdot spectroscopy experiments

Review of the 9th NLTE code comparison workshop

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