Uncertainty analysis technique for OMEGA Dante measurements

May, Mark; Widmann, K.; Sorce, C.; Park, H.-S.; Schneider, Marilyn

doi:10.1063/1.3475385

Cited by 39 publications

(7 citation statements)

References 7 publications

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“…3 are the experimental and simulated x-ray power profiles for the (a) 0-8 keV and (b) 8-20 keV emission for Dante-1 (red) and Dante-2 (blue); since the spectral resolution of the Dante is poor, we show only broad-band fluxes. The shaded areas indicate a fixed 615% uncertainty about the experimental value 26 and simulated profiles are shown as solid lines. In good agreement with the Dante data, 13 the spatially integrated simulated 0-20 keV XRCE is տ53% and the Kr K-shell (8-20 keV) XRCE is 3.5%.…”

Section: B Benchmarking With Kr Datamentioning

confidence: 99%

Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

et al. 2015

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Tailored, high-flux, multi-keV x-ray sources are desirable for studying x-ray interactions with matter for various civilian, space and military applications. For this study, we focus on designing an efficient laser-driven non-local thermodynamic equilibrium 3-5 keV x-ray source from photonenergy-matched Ar K-shell and Ag L-shell targets at sub-critical densities ($n c /10) to ensure supersonic, volumetric laser heating with minimal losses to kinetic energy, thermal x rays and laser-plasma instabilities. Using HYDRA, a multi-dimensional, arbitrary Lagrangian-Eulerian, radiation-hydrodynamics code, we performed a parameter study by varying initial target density and laser parameters for each material using conditions readily achievable on the National Ignition Facility (NIF) laser. We employ a model, benchmarked against Kr data collected on the NIF, that uses flux-limited Lee-More thermal conductivity and multi-group implicit Monte-Carlo photonics with non-local thermodynamic equilibrium, detailed super-configuration accounting opacities from CRETIN, an atomic-kinetics code. While the highest power laser configurations produced the largest x-ray yields, we report that the peak simulated laser to 3-5 keV x-ray conversion efficiencies of 17.7% and 36.4% for Ar and Ag, respectively, occurred at lower powers between $100-150 TW. For identical initial target densities and laser illumination, the Ag L-shell is observed to have տ10Â higher emissivity per ion per deposited laser energy than the Ar K-shell. Although such low-density Ag targets have not yet been demonstrated, simulations of targets fabricated using atomic layer deposition of Ag on silica aerogels ($20% by atomic fraction) suggest similar performance to atomically pure metal foams and that either fabrication technique may be worth pursuing for an efficient 3-5 keV x-ray source on NIF. V C 2015 AIP Publishing LLC.

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Section: B Benchmarking With Kr Datamentioning

confidence: 99%

Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

et al. 2015

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“…A second consistency check was done using the diagnostic DANTE [50][51][52] . This instrument is an absolutely calibrated diode-array spectrometer.…”

Section: A Validation Of Target Orientationmentioning

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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“…Ref. [ 13 , 24 , 25 ], the DMX in France [ 26 ], and the soft X-ray spectrometer used on Shenguang laser facilities in Mianyang, China [ 27 ].…”

Section: Soft X-ray Spectrometer and Compressive Sensingmentioning

confidence: 99%

“…One technique is selecting the reasonable basis function to reconstruct the spectrum. The response function [ 10 ], Piece-wise B-spline [ 10 , 11 ], and Gaussian Bumps, among others [ 12 , 13 , 14 ], are shapes of the basis function frequently used in spectrum unfolding experiments. By using these basis functions, basis atoms should be selected in some certain rules in advance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Recovery Method of Soft X-ray Spectrum Unfolding Based on Compressive Sensing

Xia

Huang

et al. 2018

Sensors

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In the experiment of inertial confinement fusion, soft X-ray spectrum unfolding can provide important information to optimize the design of the laser and target. As the laser beams increase, there are limited locations for installing detection channels to obtain measurements, and the soft X-ray spectrum can be difficult to recover. In this paper, a novel recovery method of soft X-ray spectrum unfolding based on compressive sensing is proposed, in which (1) the spectrum recovery is formulated as a problem of accurate signal recovery from very few measurements (i.e., compressive sensing), and (2) the proper basis atoms are selected adaptively over a Legendre orthogonal basis dictionary with a large size and Lasso regression in the sense of ℓ1 norm, which enables the spectrum to be accurately recovered with little measured data from the limited detection channels. Finally, the presented approach is validated with experimental data. The results show that it can still achieve comparable accuracy from only 8 spectrometer detection channels as it has previously done from 14 detection channels. This means that the presented approach is capable of recovering spectrum from the data of limited detection channels, and it can be used to save more space for other detectors.

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Uncertainty analysis technique for OMEGA Dante measurements

Cited by 39 publications

References 7 publications

Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

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

A Novel Recovery Method of Soft X-ray Spectrum Unfolding Based on Compressive Sensing

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