leonarski_fandClaude Opus 5
eb70684fa9
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A rotation sweep never records the reflections whose reciprocal vector lies within the Bragg angle of the spindle - the blind cusp. Symmetry normally supplies them from an equivalent elsewhere in reciprocal space, so the hole closes. It cannot when a symmetry axis IS the spindle: the cusp is then mapped onto itself, every reflection in it is equivalent only to other reflections in it, and it stays empty however long the sweep runs. The user can fix this at the microscope - re-mount, or add a sweep on another axis - but only if they are told, and nothing in the output mentioned it. Report the smallest angle between any proper rotation axis of the adopted space group and the goniometer axis, always on rotation data, and warn when it falls under 15 deg. The axis is found by projecting onto each operator's invariant direction (the sum of its powers annihilates everything else) and mapping that fractional direction through the refined lattice into the lab frame; the angle is invariant under the sweep, so the reference orientation is enough. Cross-check: this reports 30.6 deg for a crystal whose 4-fold an independent analysis of the XDS orientation matrix put at 30.5 deg. Measured on three rotation sets: 13.6 deg (2-fold, warns), 16.2 deg (2-fold, 99.7% complete) and 30.6 deg (4-fold). The 15 deg bound is practical rather than derived - the blind cone's half-angle is the maximum Bragg angle, ~15 deg for 2 A data at 1 A wavelength - and the wording says what the diagnostic can honestly support: the angle is a risk indicator, the loss is confined to the cone rather than spread over the data, and overall completeness may still look reasonable while the region near the spindle is empty. It does not promise a completeness number, because across those three sets the overall figure does not track the angle (99.7% at 16.2 deg, 92.6% at 30.6 deg). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Jungfraujoch
Application to receive data from the PSI JUNGFRAU and EIGER detectors.
All documentation is now placed in docs/ subdirectory and for the current version hosted on Jungfraujoch Read The Docs page.