Results 1 to 10 of about 75 (42)
Adaptive Algorithm for the Generation of Superconfigurations in Hot-Plasma Opacity Calculations [PDF]
Plasma, 2022 In hot plasmas, such as the ones encountered in astrophysics or laser-fusion studies, the number of ionic excited states may become huge, and the relevant electron configurations cannot always be handled individually.
Jean-Christophe Pain
doaj +4 more sources
Optimized recursion relation for the computation of partition functions in the superconfiguration approach [PDF]
High Energy Density Physics, 2020 Partition functions of a canonical ensemble of non-interacting bound electrons are a key ingredient of the super-transition-array approach to the computation of radiative opacity. A few years ago, we published a robust and stable recursion relation for the calculation of such partition functions.
Pain, Jean-Christophe +2 more
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A comparison of detailed level and superconfiguration models of neon [PDF]
Journal of Quantitative Spectroscopy and Radiative Transfer, 2006 The superconfiguration (SC) approach to collisional-radiative modeling can significantly decrease the computational demands of finding non-LTE level populations in complex systems. However, it has not yet been fully determined whether the statistical averaging of SC models leads to a significant loss of accuracy.
Hansen, S B +4 more
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A superconfiguration approach to multi-electron ionization of Xe under strong x-ray irradiation [PDF]
Journal of Physics B: Atomic, Molecular and Optical Physics, 2013 The production of highly ionized states in xenon under intense x-ray irradiation, is discussed with the help of specific calculations. The approach, which retains only one-photon absorption processes (photoionization and photoexcitation) as well as Auger and radiative relaxations, makes use of properly defined superconfigurations as a global ensemble ...
Peyrusse, O., Deschaud, B., Rolles, D.
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New approach to dense plasma thermodynamics in the superconfiguration approximation
Laser and Particle Beams, 2002 We propose a new approach to the calculation of ion populations in the LTE dense plasmas in the superconfiguration approximation. The screening of plasma ions is obtained using the same free-electron chemical potential for each ion charge. This chemical potential is determined by iteration keeping the total density constant and varying the volume ...
Thomas Blenski, J.-Ch. Pain
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Journal of Physics B: Atomic, Molecular and Optical Physics, 2023 Abstract One of the challenges in calculating the opacity of dense plasmas is the difficulty in consistently modeling electrons bound to nuclei and those that exist within the continuum of free states in electronic structure models. We address this issue by adapting the green’s function approach, originally developed for use in average ...
N M Gill, C J Fontes, C E Starrett
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Superconfiguration Calculations Using Green’s Functions [Slides]
, 2022 Nathanael Gill +2 more
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Multi-Configuration Calculation of Ionization Potential Depression
Plasma, 2022 The modelling of ionization potential depression in warm and hot dense plasmas constitutes a real theoretical challenge due to ionic coupling and electron degeneracy effects.
Jean-Christophe Pain
doaj +1 more source
Super Transition Arrays: A Tool for Studying Spectral Properties of Hot Plasmas
Plasma, 2021 For the theoretical study of X and extreme-UV spectra of ions in plasmas, quantum mechanics brings more detailed results than statistical physics. However, it is impossible to handle individually the billions of levels that must be taken into account in ...
Jean-Christophe Pain
doaj +1 more source
Journal of Electrical and Computer Engineering, Volume 2012, Issue 1, 2012., 2012 An enhanced genetic algorithm (EGA) is applied to solve the long‐term transmission expansion planning (LTTEP) problem. The following characteristics of the proposed EGA to solve the static and multistage LTTEP problem are presented, (1) generation of an initial population using fast, efficient heuristic algorithms, (2) better implementation of the ...
Luis A. Gallego +4 more
wiley +1 more source