Talbot-Lau x-ray deflectometry phase-retrieval methods for electron density diagnostics in high-energy density...

Area of Science:

• Physics
• Plasma Science
• X-ray Optics

Background:

• Talbot-Lau x-ray interferometry measures refractive index changes for electron density mapping.
• High-energy density experiments require specialized diagnostics like the moiré deflectometer for single-shot measurements.
• Traditional moiré deflectometry needs costly object and reference images, especially in high-energy density environments.

Purpose of the Study:

• To evaluate the feasibility of using synthetic, ex situ reference phase images for moiré x-ray deflectometry.
• To assess the accuracy of electron density mapping using a combination of moiré and phase-stepping methods.
• To improve single-exposure plasma electron density diagnostics for high-energy density and transient plasma experiments.

Main Methods:

• Developed an adapted moiré deflectometer for single-shot interferometric fringe pattern acquisition.
• Retrieved an object phase map from a single-shot moiré image of a plasma-produced x-ray source.
• Obtained a reference phase map using phase-stepping measurements with a laboratory x-ray tube source.
• Combined object and reference phase maps to retrieve an electron density map.

Main Results:

• Successfully retrieved an object phase map from a single-shot moiré image.
• Demonstrated that a combination of moiré and phase-stepping phase retrieval yields accurate refraction angle mapping.
• The ex situ method shows promise for cost-effective electron density mapping in high-energy density experiments.
• Achieved accurate electron density mapping by combining moiré and phase-stepping derived phase maps.

Conclusions:

• Synthetic reference phase images offer a viable solution for reducing the cost of moiré x-ray deflectometry.
• The combined phase-retrieval approach provides accurate refraction angle and electron density mapping.
• Optimizing x-ray backlighter quality is crucial for enhancing the resolution of ex situ electron density diagnostics.
• This technique is suitable for high-energy density and other transient plasma experiments requiring single-exposure diagnostics.