Basic principles and optical system design of 17.48 keV high-throughput modified Wolter x-ray microscope

Area of Science:

• Plasma Physics
• X-ray Optics
• Diagnostic Instrumentation

Background:

• High-precision x-ray imaging is crucial for diagnosing hotspot dynamics during inertial confinement fusion stagnation.
• Existing diagnostics (Kirkpatrick-Baez microscopes, pinhole cameras) lack adequate spatial resolution and collection efficiency at 10-20 keV.
• Time-resolved, high-energy imaging exacerbates these diagnostic limitations.

Purpose of the Study:

• To present the principles and optical design of a modified Wolter x-ray microscope for 17.48 keV imaging.
• To address the limitations of current diagnostic tools in high-energy x-ray imaging.
• To enhance the spatial resolution and signal-to-noise ratio for stagnation stage diagnostics.

Main Methods:

• Design and analysis of a modified Wolter x-ray microscope optical system.
• Calculation of geometric solid angle and estimation considering mirror reflectivity.
• Evaluation of spatial resolution across different field of view ranges.

Main Results:

• Achieved spatial resolution better than 1 µm within a ±150 µm field range.
• Achieved spatial resolution better than 3 µm across a ~408 µm diameter field of view.
• Calculated geometric solid angle of 3.0 × 10⁻⁵ sr, estimated at 1.2 × 10⁻⁶ sr with reflectivity.

Conclusions:

• The modified Wolter microscope design offers improved spatial resolution and depth of field for high-energy x-ray imaging.
• The proposed optical configuration meets preliminary requirements for high-precision optical processing.
• This instrument is expected to significantly enhance spatial resolution and signal-to-noise ratio in high-energy diagnostic applications.