Note: New method for high-space-resolving hotspot electron temperature measurements on Shenguang-III prototype

Area of Science:

• Plasma Physics
• Fusion Energy
• High-Energy-Density Physics

Background:

• Accurate measurement of hotspot electron temperature is crucial for understanding inertial confinement fusion (ICF) implosion dynamics.
• Existing diagnostic methods face challenges in achieving high spatial resolution and minimizing view field discrepancies.
• Bremsstrahlung radiation from ICF hotspots offers a potential diagnostic pathway.

Purpose of the Study:

• To develop a novel detector for high-space-resolving electron temperature measurements in ICF hotspots.
• To improve the accuracy and spatial resolution of electron temperature diagnostics.
• To overcome limitations of current diagnostic techniques in ICF research.

Main Methods:

• Utilized the bremsstrahlung radiation mechanism of the implosion hotspot.
• Employed two-channel Kirkpatrick-Baez (KB) microscopes for enhanced imaging.
• Implemented an optical quasi-coaxis method to mitigate view field differences.
• Developed a compound KB microscope design to reduce component count and optimize space.

Main Results:

• Demonstrated a novel detector capable of high-space-resolving electron temperature measurements.
• The optical quasi-coaxis method effectively eliminated view field impacts on spatial resolution and diagnostic accuracy.
• The compound KB microscope design successfully reduced the number of spherical reflectors, saving valuable space.

Conclusions:

• The proposed detector offers a significant advancement for diagnosing electron temperature in ICF hotspots.
• This technology enhances the understanding of physical processes governing ICF implosions.
• The novel diagnostic approach provides a foundation for future ICF research and development.