Code to calculate optical properties for plasmas in a wide range of densities

Rodríguez, Rafael; Gil, Juan; Florido, R.; Rubiano, J.G.; Martel, P.; Mı́nguez, E.

doi:10.1051/jp4:2006133197

Cited by 14 publications

(22 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are based on various atomic descriptions, such as hydrogenic approximation for SCAALP (Self-Consistent Average Atom for Laboratory Plasmas) [12], supraconfiguration for SCROLL (Super Configuration Radiative cOLLisional) [13,14], AVERROÈS (AVERage Rates for Out of Equilibrium Spectroscopy) [15], or MOST (MOdel for computing Superconfiguration Temperatures) [16,17], parametric or analytical potentials for ATOM3R-OP (code by Minguez et al, including atomic and optical properties) [18]. Hansen et al [17] have analyzed the respective efficiency of detailed and superconfiguration averaged CR models.…”

Section: Introductionmentioning

confidence: 99%

A comparison between detailed and configuration-averaged collisional-radiative codes applied to nonlocal thermal equilibrium plasmas

Poirier

Dortan

2007

Journal of Applied Physics

View full text Add to dashboard Cite

A collisional-radiative model describing non-local-thermodynamic-equilibrium plasmas is developed. It is based on the HULLAC suite of codes for the transitions rates, in the zero-temperature radiation field hypothesis. Two variants of the model are presented, the first one is configurationaveraged, while the second one is a detailed level version. Comparisons are made between them in the case of a carbon plasma; they show that the configuration-averaged code gives correct results for an electronic temperature T e = 10 eV (or higher) but fails at lower temperatures such as T e = 1 eV. The validity of the configuration-average approximation is discussed: the intuitive criterion requiring that the average configuration-energy dispersion must be less than the electron thermal energy turns out to be a necessary but far from sufficient condition. Another condition based on the resolution of a modified rate-equation system is proposed. Its efficiency is emphasized in the case of low-temperature plasmas. Finally, it is shown that near-threshold autoionization cascade processes may induce a severe failure of the configuration-average formalism. It is now well-known that in highly-charged hot plasmas, emission and absorption spectra usually display broad structures theoretically described as unresolved transition arrays (UTA) [1,2,3], spin-orbit split arrays (SOSA) [4] or supertransition arrays (STA) [5]. Isolated lines may also be present when transitions occur between two configurations of small degeneracy. The UTA formalism consists in expanding the individual transition energies as a function of the various moments < E n > -where the ponderation is performed using line strengths -with the assumption that levels inside a given configuration are distributed according to thermal equilibrium, the validity of this assumption lying on the condition that the configuration width ∆ c must be smaller than the thermal energy k B T e . Due to its numerous applications, the theory of non-LTE plasmas is nowadays a very active subject [19,20]. For instance, laser-produced and discharged-produced plasmas appear as very promising sources of intense extreme-UV light well suited for 13.5 nm-lithography ([21, 22, 23] and other references in the same volume); for such plasmas of moderate density, the non-LTE condition prevail in most cases. Another domain of application is low-density astrophysics plasmas as well as laboratory coronal plasmas.The aim of this paper is first to present a detailed CR model. One essential feature is that it must be based on a reliable atomic code. To this respect, the HULLAC (Hebrew University Lawrence Livermore Atomic Code) parametric-potential code is known to be efficient in applications dealing with ion spectroscopy and collisional rate calculation. A known limitation of several atomic models used in plasma physics [12,13,14,16,17] is that configuration interaction is ignored. However it has been demonstrated that configuration interaction may play a major role in several radiative effects in pla...

show abstract

Section: Introductionmentioning

confidence: 99%

A comparison between detailed and configuration-averaged collisional-radiative codes applied to nonlocal thermal equilibrium plasmas

Poirier

Dortan

2007

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…the literature, some qualitative criteria to estimate when an ion or ion level can be considered under LTE conditions are available. However, in this work a criterion that can state the regime of the whole plasma is employed, which is based on the weigthed relative differences between the ion populations calculated from Saha-Boltzmann (SB) equations and those obtained from the CRSS model [5,7]. When theat criterion is fulfilled we can assume that LTE regime has been achieved.…”

Section: Abako/rapcal Simulationsmentioning

confidence: 99%

“…The computational package ABAKO/RAPCAL [1] consists of two codes, ABAKO [4] and RAPCAL [5,6]. The first one is devoted to the calculation of the plasma level populations for arbitrary optical depths in both local thermodynamic equilibrium (LTE) and non-LTE (NLTE) conditions, using a collisional-radiative steady state (CRSS) model.…”

Section: Abako/rapcal Packagementioning

confidence: 99%

Atomic Physics Modeling and Applications for ICF Plasmas

Mı́nguez

Mendoza

Rodríguez

et al. 2013

Plasma and Fusion Research

View full text Add to dashboard Cite

The Atomic Physics Group at the Institute of Nuclear Fusion (DENIM) in Spain has accumulated experience over the years in developing a collection of computational models and tools for determining some relevant microscopic properties of, mainly, ICF and laser-produced plasmas in a variety of conditions. In this work several applications of those models in determining some relevant microscopic properties are presented.

show abstract

“…This is because only the first 65 |im of the plasma was analyzed and we should expect temperatures to drop at points far from the target. Photon energy (eV) 8.0x10 21 -^="~* fc:^-T--i k r^^- …”

Section: K-shell Spectroscopic Diagnostics Of a Laser-produced Aluminmentioning

confidence: 99%

“…Radiative properties, such as emissivities, opacities and radiative power losses, have been obtained with the RAPCAL code [9,21 ] using atomic data and level population provided by the previous modules. The bound-bound spectrum includes all the allowed transitions in the dipole approximation along with all the detailed atomic levéis considered.…”

Section: Radiative Properties Modulementioning

confidence: 99%

Opacity calculation for target physics using the ABAKO/RAPCAL code

Mı́nguez

Florido

Rodríguez

et al. 2010

High Energy Density Physics

Self Cite

View full text Add to dashboard Cite

Radiative properties of hot dense plasmas remain a subject of current interest since they play an important role in inertial confinement fusión (ICF) research, as well as in studies on stellar physics. In particular, the understanding of ICF plasmas requires emissivities and opacities for both hydro-simulations and diagnostics. Nevertheless, the accurate calculation of these properties is still an open question and continuous efforts are being made to develop new models and numerical codes that can facilítate the PACS' evaluation of such properties. In this work the set of atomic models ABAKO/RAPCAL is presented, as well as a series of results for carbón and aluminum to show its capability for modeling the population kinetics Keywords:of plasmas in both LTE and NLTE regimes. AIso, the spectroscopic diagnostics of a laser-produced Opacities aluminum plasma using ABAKO/RAPCAL is discussed. Additionally, as an interesting application of these Emissivities codes, fitting analytical formulas for Rosseland and Planck mean opacities for carbón plasmas are Population kinetics reported. These formulas are useful as input data in hydrodynamic simulation of targets where the computation task is so hard that in line computation with sophisticated opacity codes is prohibitive.

show abstract

Code to calculate optical properties for plasmas in a wide range of densities

Cited by 14 publications

References 8 publications

A comparison between detailed and configuration-averaged collisional-radiative codes applied to nonlocal thermal equilibrium plasmas

A comparison between detailed and configuration-averaged collisional-radiative codes applied to nonlocal thermal equilibrium plasmas

Atomic Physics Modeling and Applications for ICF Plasmas

Opacity calculation for target physics using the ABAKO/RAPCAL code

Contact Info

Product

Resources

About