Implementation of a Talbot–Lau x-ray deflectometer diagnostic platform for the OMEGA EP laser

Valdivia, M. P.; Stutman, D.; Stoeckl, C.; Mileham, C.; Zou, Jun; Muller, S.; Kaiser, K.-H.; Sorce, C.; Keiter, Paul; Fein, Jeffrey; Trantham, Matthew; Drake, R. P.; Regan, S. P.

doi:10.1063/1.5123919

Cited by 13 publications

(7 citation statements)

References 48 publications

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“…These adjustments could broaden the applicability of this system to lower-energy facilities. Indeed, several of these steps are already under active investigation [39].…”

Section: Discussionmentioning

confidence: 99%

“…This gives a database of background images that may be used when comparing reference images to probe images [36,37]. Doing so eliminates any phase offsets, which would have otherwise been compensated for through numerical techniques, thereby reducing numerical artefacts and improving the precision of the final results [38,39]. Additionally, while grating degradation was not significant enough to fully degrade our signal, defects became evident at later shots.…”

Section: Use For High-repetition-rate Facilities a Resolution Of Recmentioning

confidence: 99%

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Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Bouffetier¹,

Ceurvorst²,

Valdivia³

et al. 2020

Appl. Opt.

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Talbot-Lau x-ray interferometry is a grating-based phase-contrast technique, which enables measurement of refractive index changes in matter with micrometric spatial resolution. The technique has been established using a variety of hard x-ray sources, including synchrotron, free-electron lasers, and x-ray tubes, and could be used in the optical range for low-density plasmas. The tremendous development of table-top high-power lasers makes the use of high-intensity, laser-driven K-alpha sources appealing for Talbot-Lau interferometer applications in both high-energy-density plasma experiments and biological imaging. To this end, we present the first, to the best of our knowledge, feasibility study of Talbot-Lau phase-contrast imaging using a high-repetition-rate laser of moderate energy (100 mJ at a repetition rate of 10 Hz) to irradiate a copper backlighter foil. The results from up to 900 laser pulses were integrated to form interferometric images. A constant fringe contrast of 20% is demonstrated over 100 accumulations, while the signal-to-noise ratio continued to increase with the number of shots. Phase retrieval is demonstrated without prior ex-situ phase stepping. Instead, correlation matrices are used to compensate for the displacement between reference acquisition and the probing of a PMMA target rod. The steps for improved measurements with more energetic laser systems are discussed. The final results are in good agreement with the theoretically predicted outcomes, demonstrating the applicability of this diagnostic to a range of laser facilities for use across several disciplines.

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“…These adjustments could broaden the applicability of this system to lower-energy facilities. Indeed, several of these steps are already under active investigation [39].…”

Section: Discussionmentioning

confidence: 99%

Section: Use For High-repetition-rate Facilities a Resolution Of Recmentioning

confidence: 99%

Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Bouffetier¹,

Ceurvorst²,

Valdivia³

et al. 2020

Appl. Opt.

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“…The experiment was conducted at the OMEGA Extended Performance (EP) facility [ 30 , 31 ] , using an identical setup to that described by Valdivia et al [ 14 ] . A thick polystyrene (CH) foil, with mass density , was driven with a 133 J, 1 ns laser pulse at ( ), focused to an eighth-order supergaussian focal spot, with 95% of the energy contained within a radius, corresponding to a laser intensity on target of .…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, with the aim of imaging dense plasmas, there have been several efforts to adapt Talbot–Lau interferometry to high-power laser facilities [ 11 ] such as PALS [ 12 ] , the Multi-Terawatt (MTW) facility [ 13 ] and OMEGA EP [ 14 ] , as well as proof-of-concept experiments at lower-energy high-repetition rate lasers [ 4 ] . These experiments have permitted a thorough study of the optimal requirements for X-ray backlighting [ 15 ] , while also providing useful data for analysis tool development.…”

Section: Introductionmentioning

confidence: 99%

Phase imaging of irradiated foils at the OMEGA EP facility using phase-stepping X-ray Talbot–Lau deflectometry

Pérez-Callejo

Bouffetier

Ceurvorst

et al. 2023

High Pow Laser Sci Eng

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Diagnosing the evolution of laser-generated high energy density (HED) systems is fundamental to develop a correct understanding of the behavior of matter under extreme conditions. Talbot–Lau interferometry constitutes a promising tool, since it permits simultaneous single-shot X-ray radiography and phase-contrast imaging of dense plasmas. We present the results of an experiment at OMEGA EP that aims to probe the ablation front of a laser-irradiated foil using a Talbot–Lau X-ray interferometer. A polystyrene (CH) foil was irradiated by a laser of 133 J, 1 ns and probed with 8 keV laser-produced backlighter radiation from Cu foils driven by a short-pulse laser (153 J, 11 ps). The ablation front interferograms were processed in combination with a set of reference images obtained ex situ using phase-stepping. We managed to obtain attenuation and phase-shift images of a laser-irradiated foil for electron densities above ${10}^{22}\;{\mathrm{cm}}^{-3}$ . These results showcase the capabilities of Talbot–Lau X-ray diagnostic methods to diagnose HED laser-generated plasmas through high-resolution imaging.

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“…If for such an object the X-ray absorption is low, imaging could benefit from the single-shot phase-contrast technique, since it is able to enhance contrast by probing the phase-shifting properties of a plasma [ 19 , 20 ]. Experiments striving the goal of imaging laser-driven plasma shock waves with phase-contrast were performed on high-power laser facilities such as Omega EP [ 21 ] and CELIA [ 22 ] with a Talbot–Lau setup consisting of three gratings. At the PHELIX facility, the propagation-based phase-contrast imaging of laser-induced shock waves [ 23 , 24 ] was conducted.…”

Section: Introductionmentioning

confidence: 99%

Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

et al. 2021

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X-ray backlighters allow the capture of sharp images of fast dynamic processes due to extremely short exposure times. Moiré imaging enables simultaneously measuring the absorption and differential phase-contrast (DPC) of these processes. Acquiring images with one single shot limits the X-ray photon flux, which can result in noisy images. Increasing the photon statistics by repeating the experiment to gain the same image is not possible if the investigated processes are dynamic and chaotic. Furthermore, to reconstruct the DPC and transmission image, an additional measurement captured in absence of the object is required. For these reference measurements, shot-to-shot fluctuations in X-ray spectra and a source position complicate the averaging of several reference images for noise reduction. Here, two approaches of processing multiple reference imagesin combination with one single object image are evaluated regarding the image quality. We found that with only five reference images, the contrast-to-noise ratio can be improved by approximately 13% in the DPC image. This promises improvements for short-exposure single-shot acquisitions of rapid processes, such as laser-produced plasma shock-waves in high-energy density experiments at backlighter X-ray sources such as the PHELIX high-power laser facility.

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Implementation of a Talbot–Lau x-ray deflectometer diagnostic platform for the OMEGA EP laser

Cited by 13 publications

References 48 publications

Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Proof-of-concept Talbot–Lau x-ray interferometry with a high-intensity, high-repetition-rate, laser-driven K-alpha source

Phase imaging of irradiated foils at the OMEGA EP facility using phase-stepping X-ray Talbot–Lau deflectometry

Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

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