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X-ray Crystallography02:18

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Related Experiment Video

Updated: Jun 14, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

Optical alignment of an x-ray collimator.

R Hoekstra, T E d'Arnaud, H F Beek

    Applied Optics
    |April 8, 2010
    PubMed
    Summary

    A new optical alignment method precisely measures grid positions for the hard x-ray imaging spectrometer (HXIS) on NASA's Solar Maximum Mission. This ensures sub-micron accuracy for imaging solar flares with the HXIS instrument.

    Area of Science:

    • * Astrophysics
    • * Solar Physics
    • * Instrumentation

    Background:

    • * The Hard X-ray Imaging Spectrometer (HXIS) is crucial for observing solar flares.
    • * HXIS requires a grid collimator with high angular resolution (8-arcsec FWHM).
    • * Precise alignment of the ten sequential grid plates is critical for instrument performance.

    Purpose of the Study:

    • * To develop and describe a simple optical alignment method for measuring grid positions.
    • * To achieve a measurement precision of 1 micrometer for grid alignment.
    • * To ensure the positional accuracy of the HXIS collimator grids.

    Main Methods:

    • * An optical alignment technique was developed for precise grid measurements.
    • * The method focuses on measuring the position accuracy of grids within their planes.

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    Published on: February 3, 2023

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    Last Updated: Jun 14, 2026

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    10:39

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    Published on: October 11, 2016

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  • * Achieved a measurement precision of 1 micrometer.

    • Main Results:

    • * A simple optical alignment method was successfully implemented.
    • * The method demonstrated a precision of 1 micrometer for grid position measurements.
    • * This meets the stringent requirement for grid alignment accuracy (better than a few microns).

    Conclusions:

    • * The described optical method provides a viable solution for aligning HXIS collimator grids.
    • * This technique is essential for maintaining the high-resolution imaging capabilities of HXIS.
    • * Accurate alignment is key to the success of hard x-ray imaging of solar flares.