Ionization Processes and Charge-State Distribution in a Highly Ionized High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">Z</mml:mi></mml:math>Laser-Produced Plasma

Foord, Mark; Glenzer, S. H.; Thoe, R. S.; Wong, K. L.; Fournier, K. B.; Wilson, B. G.; Springer, P. T.

doi:10.1103/physrevlett.85.992

Cited by 104 publications

(49 citation statements)

References 23 publications

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“…By the 4 th workshop, the most detailed codes were in quite reasonable agreement with each other. In addition, when experimental data became available [9,10], those codes were in agreement with the data. We take this result as an indication that the approach being used is sound, the atomic data is calculable, and the overall problem is tractable, although computationally very expensive.…”

Section: Introductionsupporting

confidence: 66%

Advances in NLTE modeling for integrated simulations

Scott

Hansen

2010

High Energy Density Physics

192

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The last few years have seen significant progress in constructing the atomic models required for non-local thermodynamic equilibrium (NLTE) simulations. Along with this has come an increased understanding of the requirements for accurately modeling the ionization balance, energy content and radiative properties of different elements for a wide range of densities and temperatures. Much of this progress is the result of a series of workshops dedicated to comparing the results from different codes and computational approaches applied to a series of test problems. The results of these workshops emphasized the importance of atomic model completeness, especially in doubly excited states and autoionization transitions, to calculating ionization balance, and the importance of accurate, detailed atomic data to producing reliable spectra.We describe a simple screened-hydrogenic model that calculates NLTE ionization balance with surprising accuracy, at a low enough computational cost for routine use in radiation-hydrodynamics codes. The model incorporates term splitting, n=0 transitions, and approximate UTA widths for spectral calculations, with results comparable to those of much more detailed codes. Simulations done with this model have been increasingly successful at matching experimental data for laser-driven systems and hohlraums.Accurate and efficient atomic models are just one requirement for integrated NLTE simulations. Coupling the atomic kinetics to hydrodynamics and radiation transport constrains both discretizations and algorithms to retain energy conservation, accuracy and stability. In particular, the strong coupling between radiation and populations can require either very short timesteps or significantly modified radiation transport algorithms to account for NLTE material response. Considerations such as these continue to provide challenges for NLTE simulations.

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Section: Introductionsupporting

confidence: 66%

Advances in NLTE modeling for integrated simulations

Scott

Hansen

2010

High Energy Density Physics

192

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“…There have been several experiments in which the ionisation distribution has been measured for a non-LTE plasma of high energy density with no (or negligible) imposed radiation field and where the sample is so small that the radiation field generated within the plasma can be neglected, for example [10,11,15,8,39]. There have been very few experiments in which the ambient radiation field has been imposed and is sufficiently high to significantly alter the distribution of excitation and ionisation.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 98%

The effect of a radiation field on excitation and ionisation in non-LTE high energy density plasmas

Rose

2009

High Energy Density Physics

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“…Measurements of opacities for these materials can help constrain opacity models used in the simulations. Experiments of the type performed by Foord [27] and Heeter [28] produce detailed opacity data for plasma conditions of interest in hohlraums, including the relevant ionization states. More measurements should be made of the opacities of these materials for NIFrelevant plasma parameters to constrain better the opacities models used.…”

Section: High Impact Experiments On Hed Facilities To Address Uncertamentioning

confidence: 99%

Science of Fusion Ignition on NIF

Goldstein¹

2012

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Ionization Processes and Charge-State Distribution in a Highly Ionized High-ZLaser-Produced Plasma

Cited by 104 publications

References 23 publications

Advances in NLTE modeling for integrated simulations

Advances in NLTE modeling for integrated simulations

The effect of a radiation field on excitation and ionisation in non-LTE high energy density plasmas

Science of Fusion Ignition on NIF

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