Invited article: X-ray phase contrast imaging in inertial confinement fusion and high energy density research

Montgomery, D. S.

doi:10.1063/5.0127497

Cited by 18 publications

(4 citation statements)

References 85 publications

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“…In this scenario, a grating-based approach is favored over propagation-based phase-contrast imaging. First, the limited photon flux from the uniformly emitting X-ray backlighter [15] together with the long propagation distances between source, target, and detector required for the propagation approach [16] causes a high level of photon noise. For the grating-based approach, these strict requirements for long propagation distances do not apply.…”

Section: Introductionmentioning

confidence: 99%

Design of a Talbot phase-contrast microscopy imaging system with a digital detector for laser-driven X-ray backlighter sources

Schreiner,

Rauch,

Akstaller

et al. 2024

J. Inst.

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Laser-driven shock waves in matter propagate with multiple kilometers per second and therefore require sources like a laser-driven backlighter, which emit the X-rays within picoseconds, to be able to capture sharp images. The small spatial extent of shocks in low-density materials pose challenges on the imaging setup. In this work, we present a design process for a single-shot X-ray phase-contrast imaging system geared towards these objects, consisting of a two-grating Talbot interferometer and a digital X-ray detector. This imaging system is optimized with respect to the detectable refraction angle of the X-rays induced by an object, which implies a high phase sensitivity. Therefore, an optimization parameter is defined that considers experimental constraints such as the limited number of photons, the required magnification, the size and spectrum of the X-ray source, and the visibility of the moiré fringes. In this way, a large parameter space is sampled and a suitable imaging system is chosen. During a campaign at the PHELIX high-power laser facility a static test sample was imaged which is used to benchmark the optimization process and the imaging system under real conditions. The results show good agreement with the predicted performance, which demonstrates the reliability of the presented design process. Likewise, the process can be adapted to other types of laser experiments or X-ray sources and is not limited to the application presented here.

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Section: Introductionmentioning

confidence: 99%

Design of a Talbot phase-contrast microscopy imaging system with a digital detector for laser-driven X-ray backlighter sources

Schreiner,

Rauch,

Akstaller

et al. 2024

J. Inst.

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“…In XPCI the detected intensity is a function of the first or even the second derivative of the electron density (depending on the technique employed) [6]. The consequence is that XPCI is more sensitive to density gradients than absorption-based imaging [7].…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of an XPCI diagnostic to observe the evolution of micro-voids in an ICF target

Barbato,

Savino,

Schiavi

et al. 2024

Plasma Phys. Control. Fusion

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Bulk perturbations (voids or crystalline structure) inside the ablator of a capsule used for inertial confinement fusion are seeds for instabilities that can hinder the ignition. The study of these defects and their evolution during the implosion is one of the steps needed to achieve fusion. The current methods used by the field are to infer these effects indirectly with measurements of implosion velocity and neutron yield, among others. Observing them directly with an X-ray imaging diagnostic it is difficult due to the small scale length of these defects. In this work we study the feasibility of a new diagnostic based on X-ray phase-contrast imaging. This technique has been demonstrated to perform better than standard X-ray absorption techniques in critical situations like this. By using a synthetic diagnostic we show the capabilities of this new possible approach and the limits in relation to the parameters of currently available laser facilities.

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“…This technique relies on the spatial propagation of the altered phase front, imposing high demands on the spatial coherence of the X-ray source. As a result, this technique finds primary application at free-electron laser (FEL) facilities, 11,12 but has also been demonstrated with laser-driven backlighters. 13,14 Grating-based phase-contrast imaging uses a grating interferometer to obtain phase information.…”

Section: Introductionmentioning

confidence: 99%

Demonstrating grating-based phase-contrast imaging of laser-driven shock waves

Wegert,

Schreiner,

Rauch

et al. 2024

Matter and Radiation at Extremes

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Single-shot X-ray phase-contrast imaging is used to take high-resolution images of laser-driven strong shock waves. Employing a two-grating Talbot interferometer, we successfully acquire standard absorption, differential phase-contrast, and dark-field images of the shocked target. Good agreement is demonstrated between experimental data and the results of two-dimensional radiation hydrodynamics simulations of the laser–plasma interaction. The main sources of image noise are identified through a thorough assessment of the interferometer’s performance. The acquired images demonstrate that grating-based phase-contrast imaging is a powerful diagnostic tool for high-energy-density science. In addition, we make a novel attempt at using the dark-field image as a signal modality of Talbot interferometry to identify the microstructure of a foam target.

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Invited article: X-ray phase contrast imaging in inertial confinement fusion and high energy density research

Cited by 18 publications

References 85 publications

Design of a Talbot phase-contrast microscopy imaging system with a digital detector for laser-driven X-ray backlighter sources

Design of a Talbot phase-contrast microscopy imaging system with a digital detector for laser-driven X-ray backlighter sources

Feasibility study of an XPCI diagnostic to observe the evolution of micro-voids in an ICF target

Demonstrating grating-based phase-contrast imaging of laser-driven shock waves

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