Radiation transfer in cylindrical, toroidal and hemi-ellipsoidal plasmas

Pérez-Callejo, G.; Wark, J. S.; Rose, S. J.

doi:10.1016/j.jqsrt.2019.06.008

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…It was shown that two-dimensional radiative transfer simulations using the code Cretin 28 can reproduce the experimental line ratios to a much higher degree than models which do not include the plasma geometry. Additionally, it was found that the w/y ratio obtained from two different views of the cylinder can be used as a diagnostic of the ion density of the plasma 26,29 , given that these ratios are dictated by the optical depth of the plasma through the mean chord and the line of sight 18,19,30 , which is directly proportional to the ion density.…”

Section: Introductionmentioning

confidence: 99%

A novel method to measure ion density in ICF experiments using x-ray spectroscopy of cylindrical tracers

et al. 2020

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The indirect drive approach to inertial confinement fusion (ICF) has undergone important advances in the past years. The improvements in temperature and density diagnostic methods are leading to more accurate measurements of the plasma conditions inside the hohlraum and therefore to more efficient experimental designs. The implementation of dot spectroscopy has proven to be a versatile approach to extracting spaceand time-dependent electron temperatures. In this method a microdot of a mid-Z material is placed inside the hohlraum and its K-shell emission spectrum is used to determine the plasma temperature. However, radiation transport of optically thick lines acting within the cylindrical dot geometry influences the outgoing spectral distribution in a manner that depends on the viewing angle. This angular dependence has recently been studied in the high energy density (HED) regime at the OMEGA laser facility, which allowed us to design and benchmark appropriate radiative transfer models that can replicate these geometric effects. By combining these models with the measurements from the dot spectroscopy experiments at the National Ignition Facility (NIF), we demonstrate here a novel technique that exploits the transport effects to obtain time-resolved measurements of the ion density of the tracer dots, without the need for additional diagnostics. We find excellent agreement between experiment and simulation, opening the possibility of using these geometric effects as a density diagnostic in future experiments.

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Section: Introductionmentioning

confidence: 99%

A novel method to measure ion density in ICF experiments using x-ray spectroscopy of cylindrical tracers

et al. 2020

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“…The content of Section 2.3 was published in its entirety in Journal of Quantitative Spectroscopy and Radiative Transfer[54], with the exception of the cylindrical case, which is an excerpt of a publication in High Energy Density Physics[55].…”

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confidence: 99%

Spectroscopic characterisation of the effects of plasma geometry on the angular distribution of X-Ray emission in HED plasmas

Perez-Callejo¹

2020

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The author gratefully acknowledges support from Lawrence Livermore National Laboratory under grant number B617350. The author wants to thank the experimental crew of the Omega laser at the University of Rochester Laboratory for Laser Energetics for expertly executing the experiments described here. The targets for those experiments were fabricated by General Atomics thanks to support from the National Nuclear Security Administration under contract DE-NA0001808.

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Radiation transfer in cylindrical, toroidal and hemi-ellipsoidal plasmas

Cited by 2 publications

References 14 publications

A novel method to measure ion density in ICF experiments using x-ray spectroscopy of cylindrical tracers

A novel method to measure ion density in ICF experiments using x-ray spectroscopy of cylindrical tracers

Spectroscopic characterisation of the effects of plasma geometry on the angular distribution of X-Ray emission in HED plasmas

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