X-ray tests of a two-dimensional stigmatic imaging scheme with variable magnifications

Area of Science:

• X-ray optics
• Plasma diagnostics
• Crystallography

Background:

• A two-dimensional stigmatic x-ray imaging scheme utilizing matched spherical crystals was previously proposed.
• Eliminating astigmatism and satisfying Bragg conditions are critical for accurate x-ray imaging.

Purpose of the Study:

• To explore generalized configurations of the stigmatic x-ray imaging scheme.
• To enable variable magnification for a given crystal pair and x-ray energy.
• To validate the imaging scheme with a micro-focus x-ray source.

Main Methods:

• Employed a system with a concave and a convex spherically bent crystal.
• Utilized tungsten Lα1 emission (8.3976 keV) for validation.
• Configured with Si-422 (convex) and Si-533 (concave) crystals with specific radii of curvature.

Main Results:

• Successfully imaged x-rays from an 8.4 μm micro-focus source.
• Achieved a spatial resolution of 54.9 μm.
• Demonstrated the capability for variable magnification.

Conclusions:

• The generalized stigmatic x-ray imaging scheme allows for adjustable magnification.
• The system's performance was validated, showing promising spatial resolution.
• This technique is suitable for two-dimensional imaging of laser-produced plasmas.