Influence on imaging performance and evaluation of Wolter-I type mandrel fabrication errors

Area of Science:

• Optics
• Astrophysics
• Materials Science

Background:

• Electroforming replication is key for nested x-ray telescope fabrication.
• Mandrel shape accuracy critically impacts replicated mirror imaging performance.

Purpose of the Study:

• To develop a model predicting imaging performance of x-ray telescope mirrors based on mandrel errors.
• To analyze the impact of fabrication errors on imaging quality.
• To establish a method for evaluating mandrel quality and guiding fabrication.

Main Methods:

• A specialized Monte Carlo ray tracing model was developed and experimentally validated.
• Ray tracing numerical calculations were used to analyze fabrication error influences.
• Slope error simulations informed a method for relating mandrel errors to imaging quality.

Main Results:

• The model accurately predicts imaging performance degradation due to mandrel errors.
• Major fabrication errors and their impact on imaging were quantified.
• A novel method using power spectral density (PSD) was proposed and verified for mandrel quality assessment.

Conclusions:

• The developed ray tracing model is effective for predicting x-ray telescope mirror performance.
• The proposed PSD-based method reliably reflects mandrel quality and can guide fabrication processes.
• Optimizing mandrel fabrication is crucial for achieving high-performance nested x-ray telescopes.