Direct multiple monochromatic x-ray imaging with a pinhole array and a laterally graded multilayer mirror

Area of Science:

• Plasma Physics
• X-ray Optics
• Fusion Energy Research

Background:

• Laser-driven inertial confinement fusion (ICF) experiments require precise diagnostics of tracer element emission spectra.
• Existing methods for monochromatic x-ray imaging (MMI) face challenges in spectral resolution and direct data acquisition.

Purpose of the Study:

• To develop and validate a novel MMI technique for diagnosing emission spectra in ICF.
• To achieve direct, synchronous capture of spatial, temporal, and spectral information of laser plasma x rays.

Main Methods:

• A new MMI method combining a pinhole array with a laterally graded multilayer mirror was designed and fabricated.
• Multilayer thickness was regulated to compensate for energy-broadening effects, enabling direct monochromatic image acquisition.

Main Results:

• The developed MMI method achieved monochromatic imaging with a spectral resolution of approximately 70-90 eV in the keV energy range.
• Experimental verification confirmed the effectiveness of the gradient multilayer mirror design.

Conclusions:

• The proposed MMI technique offers a practical and effective diagnostic approach for ICF research.
• This method significantly enhances the ability to analyze laser plasma x-ray characteristics.