Talbot-Lau x-ray interferometry for high energy density plasma diagnostic

Area of Science:

• Plasma Physics
• X-ray Imaging
• Diagnostic Techniques

Background:

• High energy density laboratory plasmas (HEDLP) present diagnostic challenges due to the difficulty of probing dense plasmas.
• Hard X-rays offer a potential solution for probing these dense environments.

Purpose of the Study:

• To investigate the application of differential phase-contrast X-ray imaging using Talbot-Lau interferometers for HEDLP diagnostics.
• To assess the method's capability in measuring electron density and small-scale hydrodynamic instabilities.
• To explore adaptations for HEDLP environments and extensions to higher X-ray energies.

Main Methods:

• Utilizing Talbot interferometry, which employs micro-periodic gratings to measure X-ray refraction and scattering.
• Adapting the technique for use with incoherent and polychromatic X-ray sources, such as laser-driven backlighters.
• Investigating the use of micro-periodic mirrors for extending the method to higher X-ray energies.

Main Results:

• Demonstrated the feasibility of Talbot interferometry for HEDLP diagnostics.
• Showcased the method's ability to probe electron density and hydrodynamic instabilities.
• Presented experimental validation using a laboratory Talbot interferometer.

Conclusions:

• Talbot interferometry is a promising technique for high-resolution density diagnostics in HEDLP.
• The method is adaptable to the specific conditions of HEDLP experiments, including source characteristics.
• Potential exists for extending this diagnostic approach to higher X-ray energies for broader applicability.