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Figure 8
Alignment scheme used by Zhang et al. (2023aBB23) for the rotation (yaw) axis in tomography, reimplemented in our framework and running with a virtual beamline, where the detector images acquired during tomographic scans are monitored in the window in the upper right. To align the rotation axis precisely perpendicular to the beam direction, a strongly absorbing particle is added to a calibration sample, and its projection can be seen from the detector images. The projection's trajectory during a tomographic scan with a non-optimal attitude (for the pitch and roll axes) is an ellipse or a diagonal line, which gradually degenerates into a horizontal line as the attitude improves. The tuning procedure is composed of a coarse move computed from the initial shape of the trajectory according to formulae available in the paper above, and then fine tuning of the attitude based on numerical optimization of the shape.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 4| July 2025| Pages 924-933
https://doi.org/10.1107/S1600577525003960
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