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High-efficiency full-surface defects detection for an ICF capsule based on a null interferometric microscope.

Cong Wei, Jianxin Li, Jun Ma

|March 10, 2021

Summary

This summary is machine-generated.

This study introduces a novel null interferometric microscope (NIM) for detecting defects on inertial confinement fusion (ICF) capsules. The method ensures high-precision, full-surface defect detection, improving fusion ignition probability.

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Area of Science:

Fusion energy research
Optical metrology
Materials science

Background:

Inertial confinement fusion (ICF) relies on precisely manufactured capsules containing deuterium tritium fuel.
Surface defects on ICF capsules can significantly reduce the probability of successful ignition.
Accurate and efficient defect detection is crucial for advancing ICF technology.

Purpose of the Study:

To develop and validate a high-precision, high-efficiency, full-surface defect detection method for ICF capsules.
To address the limitations of existing methods in detecting isolated surface defects.
To enhance the reliability and success rate of ICF experiments.

Main Methods:

Utilized a null interferometric microscope (NIM) integrated with a dynamic phase-shifting module for single-shot measurements.
Implemented a capsule controlling system for rotational scanning and lattice-based data acquisition of all subapertures.
Employed online compensation of eccentricity error using wavefront aberration measurements to ensure accuracy.

Main Results:

Achieved lateral resolution of 0.7 µm for an 875-µm-diameter capsule.
Completed full-surface defect detection in less than 1 hour.
Acquired approximately 50 million sampling points for comprehensive surface analysis.

Conclusions:

The proposed NIM-based method provides simultaneous high-efficiency and high-resolution full-surface defect detection for ICF capsules.
This is the first system demonstrated to achieve both high efficiency and high resolution for ICF capsule defect inspection.
The developed technique is expected to significantly contribute to the advancement of inertial confinement fusion research.