Isoelectronic x-ray spectroscopy to determine electron temperatures in long-scale-length inertial-confinement-fusion plasmas

Shepard, T. D.; Back, C. A.; Kalantar, D. H.; Kauffman, R. L.; Keane, C. J.; Klem, D. E.; Lasinski, B. F.; MacGowan, B. J.; Powers, L. V.; Suter, L J; Turner, R. E.; Failor, B. H.; Hsing, W. W.

doi:10.1103/physreve.53.5291

Cited by 24 publications

(30 citation statements)

References 20 publications

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“…Measuring the temperature and density of plasmas in High Energy Density (HED) experiments is fundamental to understanding the conditions of the plasma and to design better experimental set-ups. Spectroscopy is a commonly used method for temperature [1,2,3,4,5,6,7,8,9,10,11] and plasma density measurements, with various different methods being applied depending on the temperatures and densities involved.…”

Section: Introductionmentioning

confidence: 99%

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The use of geometric effects in diagnosing ion density in ICF-related dot spectroscopy experiments

Pérez-Callejo

Liedahl

Schneider

et al. 2019

High Energy Density Physics

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We describe a method to calculate the ion density of High Energy Density (HED) cylindrical plasmas used in Dot Spectroscopy experiments. This method requires only spectroscopic measurements of the Heα region obtained from two views (Face-on and Side-on). We make use of the fact that the geometry of the plasma affects the observed flux of optically thick lines. The ion density can be derived from the aspect ratio (height-to-radius) of the cylinder and the optical depth of the Heα-y line (1s2p 3 P 1 → 1s 2 1 S 0 ). The aspect ratio and the optical depth of the y line are obtained from the spectra using ratios measured from the two directions of emission of the optically thick Heα-w line (1s2p 1 P 1 → 1s 2 1 S 0 ) and the ratio of the optically thick to thin lines. The method can be applied to mid-Z elements at ion densities of 10 19 − 10 20 cm −3 and temperatures of a the order of keV, which is a relevant regime for Inertial Confinement Fusion (ICF) experiments.

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Section: Introductionmentioning

confidence: 99%

“…Over the past few years there has been an increasing interest in using dot spectroscopy [4,5] for diagnosing the temperature in plasmas in ICF hohlraums [8,9,10,11]. The dots are cylinders of mid-Z materials with a thickness of ∼ 0.1 − 0.3 µm and a diameter of the order of 250 − 800 µm, as this geome-try is easy to manufacture.…”

Section: Introductionmentioning

confidence: 99%

The use of geometric effects in diagnosing ion density in ICF-related dot spectroscopy experiments

Pérez-Callejo

Liedahl

Schneider

et al. 2019

High Energy Density Physics

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“…This approach was used at NOVA 31 in its early stages of development 26,32 , and has been used more recently at the National Ignition Facility (NIF) 33 to obtain the time evolution of the temperature of the hohlraum plasma during an ICF experiment 27,34 .…”

Section: Introductionmentioning

confidence: 99%

“…Most of the experiments using this approach 27,32,34 at the National Ignition Facility (NIF), focus on the He-α emission, as it is one of the most intense components of the spectrum.…”

Section: Introductionmentioning

confidence: 99%

Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics

et al. 2019

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optically-thin Li-like satellite emission could be used for temperature diagnosis. This allowed for the characterization of optical-depth-dependent geometric effects in the vanadium line emission. Simulations present good agreement with the data, which allows this study to benchmark these effects in order to take them into account to deduce temperature and density in future ICF experiments, such as those performed at the National Ignition Facility (NIF).

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“…Spectroscopy is a widely used method for diagnosing both astrophysical and laboratory-based high energy density (HED) plasmas, with a significant amount of information about the densities and temperatures of such systems being gleaned from the ratios and widths of spectral lines [1][2][3][4][5][6][7][8]. Since the earliest development of the field, it has been well known that the finite size and the geometry of the plasma should play a significant role in the observed line ratios [9], owing to the potential for multiple absorptions and re-emissions of photons from transitions with large radiative cross sections.…”

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confidence: 99%

Demonstration of Geometric Effects and Resonant Scattering in the X-Ray Spectra of High-Energy-Density Plasmas

et al. 2021

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In a plasma of sufficient size and density, photons emitted within the system have a probability of being re-absorbed and re-emitted multiple times -a phenomenon known in astrophysics as resonant scattering. This effect alters the ratio of optically-thick to optically thin lines, depending on the plasma geometry and viewing angle, and has significant implications for the spectra observed in a number of astrophysical scenarios, but has not previously been studied in a controlled laboratory plasma. We demonstrate the effect in the x-ray spectra emitted by cylindrical plasmas generated by high power laser irradiation, and the results confirm the geometrical interpretation of resonant scattering.

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Isoelectronic x-ray spectroscopy to determine electron temperatures in long-scale-length inertial-confinement-fusion plasmas

Cited by 24 publications

References 20 publications

The use of geometric effects in diagnosing ion density in ICF-related dot spectroscopy experiments

The use of geometric effects in diagnosing ion density in ICF-related dot spectroscopy experiments

Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics

Demonstration of Geometric Effects and Resonant Scattering in the X-Ray Spectra of High-Energy-Density Plasmas

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