Large-field high-resolution X-ray AKB microscope for measuring hydrodynamic instabilities at the SG-III prototype...

Area of Science:

• Plasma Physics
• Fusion Energy
• X-ray Optics

Background:

• Accurate measurement of Rayleigh-Taylor instabilities in laser inertial confinement fusion (ICF) requires high-resolution X-ray imaging over a large field of view (FOV).
• Traditional imaging techniques often face limitations in achieving both high resolution and a wide FOV simultaneously, hindering detailed analysis of small-amplitude, high-spatial-frequency instabilities.

Purpose of the Study:

• To develop and validate an advanced Kirkpatrick-Baez (AKB) microscope capable of large FOV and high-resolution X-ray imaging.
• To apply the developed AKB microscope for in-situ imaging of hydrodynamic instabilities in ICF implosion experiments.

Main Methods:

• Design and construction of an AKB microscope based on quadratic-aberration theory.
• Laboratory assembly and testing of the AKB microscope.
• Application of the AKB microscope in implosion experiments at the Shenguang-III prototype laser facility.

Main Results:

• The AKB microscope achieved optimal resolutions of approximately 0.53 μm and 0.40 μm.
• A spatial resolution of less than 1.5 μm was obtained within a 300-μm FOV.
• A spatial resolution of less than 4.5 μm was achieved within a 1-mm FOV.

Conclusions:

• The developed AKB microscope successfully addresses the need for large FOV and high-resolution X-ray imaging in ICF.
• The AKB microscope provides critical diagnostic capabilities for studying hydrodynamic instabilities in ICF implosion experiments.
• The imaging performance demonstrates the potential of this advanced optical system for future ICF research.