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Updated: Feb 15, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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    Off-plane x-ray reflection gratings offer high resolution for soft x-ray spectroscopy. Current alignment methods achieved desired results for a suborbital rocket payload, paving the way for future missions.

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    Area of Science:

    • X-ray optics and instrumentation
    • Astrophysical spectroscopy

    Background:

    • Off-plane x-ray reflection gratings offer high resolution and diffraction efficiency in the soft x-ray spectrum.
    • These gratings are crucial for upcoming x-ray spectroscopy missions.

    Purpose of the Study:

    • To assess current optical alignment methods for grating modules using x-ray testing.
    • To evaluate the performance of an aligned grating module for a suborbital rocket payload.

    Main Methods:

    • X-ray testing was conducted on an aligned grating module.
    • The module's alignment was assessed for effective area and resolving power.

    Main Results:

    • The grating module achieved the required alignment for an upcoming suborbital rocket payload.
    • Modest effective area and resolving power were observed with current alignment techniques.

    Conclusions:

    • Current alignment methods are suitable for near-term suborbital rocket payloads.
    • Future missions require enhanced alignment metrology, grating fabrication, and testing techniques for stricter tolerances.