Iron-Plasma Transmission Measurements at Temperatures Above 150 eV

Bailey, James E.; Rochau, Gregory A.; Iglesias, Carlos A.; Abdallah, J.; Macfarlane, J. J.; Golovkin, I.; Wang, P.; Mancini, Roberto; Lake, P.; Moore, Timothy; Bump, M.; Garcia, Odd Erik; Mazevet, S.

doi:10.1103/physrevlett.99.265002

Cited by 158 publications

(149 citation statements)

References 36 publications

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“…As mentioned in Section 1, Bailey et al published in 2007 a measurement, performed on the Z-pinch facility, of the iron transmission at conditions lower than those of the basis of the convective zone (T = 156 eV and ρ = 0.058 g/cm 3 ) [33]. This first measurement agrees well with most of the theoretical predictions.…”

Section: Attempts To Understand the Enigmatic Photo-absorption Experisupporting

confidence: 78%

“…The radiation at the stagnation is used to probe the sample. The experimental spectrum was well reproduced by many fine-structure opacity codes [33] (see Figure 5 for the comparison with SCO-RCG). The features around 12.4 Å were not reproduced by any of the involved codes.…”

Section: Interpretation Of Experimentsmentioning

confidence: 81%

“…The authors would like to thank all the authors of References [27][28][29][30][31]33,34] for the experimental spectra as well as J. Colgan for providing the ATOMIC spectra.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…The areal mass of copper is equal to 15 µg/cm 2 and that of aluminum to 14 µg/cm 2 . In 2007, Bailey et al reported on iron transmission measurements at inferred T = 156 eV and n e = 6.9 × 10 21 cm −3 over the photon energy range hν ≈ 800-1800 eV [33]. The samples consisted of an Fe/Mg mixture fully tamped on both sides by a 10 µm thick parylene-N (C 8 H 8 ).…”

Section: Interpretation Of Experimentsmentioning

confidence: 99%

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Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-of-the-art precise spectral opacity calculations, illustrated by stellar applications. The essential role of laboratory experiments to check the quality of the computed data is underlined. We review some X-ray and XUV laser and Z-pinch photo-absorption measurements as well as X-ray emission spectroscopy experiments involving hot dense plasmas produced by ultra-high-intensity laser irradiation. The measured spectra are systematically compared with the fine-structure opacity code SCO-RCG. The focus is on iron, due to its crucial role in understanding asteroseismic observations of β Cephei-type and Slowly Pulsating B stars, as well as of the Sun. For instance, in β Cephei-type stars, the iron-group opacity peak excites acoustic modes through the "kappa-mechanism". Particular attention is paid to the higher-than-predicted iron opacity measured at the Sandia Z-machine at solar interior conditions. We discuss some theoretical aspects such as density effects, photo-ionization, autoionization or the "filling-the-gap" effect of highly excited states.

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Section: Attempts To Understand the Enigmatic Photo-absorption Experisupporting

confidence: 78%

Section: Interpretation Of Experimentsmentioning

confidence: 81%

“…The authors would like to thank all the authors of References [27][28][29][30][31]33,34] for the experimental spectra as well as J. Colgan for providing the ATOMIC spectra.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Section: Interpretation Of Experimentsmentioning

confidence: 99%

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Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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“…The predicted spectrum for Fe at T e = 156 eV and n e =8ϫ 10 21 cm −3 , is also shown, which corresponds to the conditions of recent opacity measurements on Fe made at Z. 58 The enormous complexity and detail in the bound-bound transition lines in the open L-shell of Fe at these conditions is immediately apparent. Accurate models of stellar interiors require accurate opacity simula- tions of Fe and the other stellar constituents, in all this complexity, and this will require experiments at relevant conditions against which to compare.…”

Section: Opacitiesmentioning

confidence: 99%

The National Ignition Facility: Ushering in a new age for high energy density science

Moses¹,

Boyd²,

Remington³

et al. 2009

Physics of Plasmas

419

221

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The National Ignition Facility (NIF) [E. I. Moses, J. Phys.: Conf. Ser. 112, 012003 (2008); https://lasers.llnl.gov/], completed in March 2009, is the highest energy laser ever constructed. The high temperatures and densities achievable at NIF will enable a number of experiments in inertial confinement fusion and stockpile stewardship, as well as access to new regimes in a variety of experiments relevant to x-ray astronomy, laser-plasma interactions, hydrodynamic instabilities, nuclear astrophysics, and planetary science. The experiments will impact research on black holes and other accreting objects, the understanding of stellar evolution and explosions, nuclear reactions in dense plasmas relevant to stellar nucleosynthesis, properties of warm dense matter in planetary interiors, molecular cloud dynamics and star formation, and fusion energy generation.

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Introduction

Burdiak

2014

Springer Theses

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Iron-Plasma Transmission Measurements at Temperatures Above 150 eV

Cited by 158 publications

References 36 publications

Detailed Opacity Calculations for Astrophysical Applications

Detailed Opacity Calculations for Astrophysical Applications

The National Ignition Facility: Ushering in a new age for high energy density science

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