Computer simulations
Introduction
Lately, a clear trend in the development and applications of linebroadening calculations is a significant increase in the computational results, in particular, using computer simulations [1].
Computer simulation is the discipline of designing an abstract model of an actual physical system, executing the model on a computer, and analyzing the execution output. The scale of models being simulated by computer simulations today far exceeds anything possible (or perhaps even imaginable) using traditional paperandpencil mathematical modeling.
Method
The calculations [2] are split into two largely independent computational pieces. The first one is the moleculardynamics Nbody simulation that models the motion of plasma particles. The fields produced at the radiators, as a result of the essentially chaotic motion of the plasma particles modeled, are stored as a function of time for a subsequent use in the second computational piece. The latter piece treats these "field histories'' as a timedependent perturbating potential while solving the Schrödinger equation for a radiating atom.
The method is rather unique in its universality and in the broad scope of effects included, naturally accounting for all frequency regions of the plasmaparticle fields and for the effects of the particle interactions, being applicable to lineshape calculations of isolated and overlapping spectral lines involving both dipoleallowed and dipoleforbidden radiative transitions under a simultaneous influence of externallyapplied (constant or timedependent) electric and magnetic fields in both weakly and strongly coupled plasmas.
Applications
The method has been used for benchmarking competing Starkbroadening theories [3], analyzing the influence of the correlations effects on the line shapes in plasmas [2,4], spectroscopic analysis of radiationheated foams [5,6], stateoftheart accurate atomicdata measurements [7], and 3Dmapping of fluctuating electric fields in pulsed plasmas [8].
References

Plasma line broadening and computer simulations: A minireview

A study of iondynamics and correlation effects for spectral line broadening in plasma: Kshell lines

Stark broadening of high principal quantum number hydrogen Balmer lines in lowdensity laboratory plasmas

Correlation effects and their influence on line broadening in plasmas: Application to H_{α}

J. E. Bailey, G. A. Chandler, G. A. Rochau, Y. Maron, S. A. Slutz, G. S. Dunham, I. Golovkin, P. W. Lake, R.W. Lemke, J. M. Lucas, J. J. MacFarlane, T. A. Mehlhorn, T. C. Moore, D. G. Schroen, E. Stambulchik, and K. YoungbloodTime and spaceresolved spectroscopy of dynamic hohlraum interiors

G. A. Rochau, J. E. Bailey, Y. Maron, G. A. Chandler, G. S. Dunham, D. V. Fisher, V. I. Fisher, R. W. Lemke, J. J. MacFarlane, K. J. Peterson, D. G. Schroen, S. A. Slutz, and E. StambulchikRadiating Shock Measurements in the ZPinch Dynamic Hohlraum

Determination of the Li I 4d4f Energy Separation Using Active Spectroscopy

Electric fields in plasmas under pulsed currents
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Modified on: 20121220
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