leonarski_fandClaude Opus 5 e02dd2e924
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rugnux: the two-pass guard weighs the reflections a space group is read from
The guard that chooses between the file's geometry and the refined one judged the two passes on
CC1/2 alone. CC1/2 is an average over tens of thousands of reflections and the principal axial
rows hold a few dozen, so a pass can win it while measuring half the axial reflections the other
one did - and the systematic absences that decide a screw axis are read from nothing else. An
axial reflection crosses the Ewald sphere over a narrow range of the sweep, so a pass that loses
frames loses whole rows rather than a scattering of reflections.

Measured on a crystal that was losing a screw exactly this way: the refined pass held 7 of the 16
low-order axial reflections and won the gate by 0.0114 in CC1/2, which is inside its own noise.
The screw evidence fell from 24.2 nats to 10.5, under the bar, and the run reported the
symmorphic group.

A third arm, beside the two the guard already had: refuse the refined pass when it holds under
three quarters of pass 1's axial reflections AND its CC1/2 does not say it is better. It can only
decide cases the gate was deciding on a difference inside its own noise, and it needs pass 1 to
hold enough of the row for a screw to be claimable at all.

Over the corpus it fires on three crystals: the one it was built for, which recovers its screw; a
second that gains 0.057 in CC1/2 and was being handed the wrong geometry for reasons nobody was
looking for; and a third that loses 0.009. The other 145 are untouched.

This closes a regression the six-spot floor exposed. The floor did not cause it - at the old
floor the refined pass was broken outright and the CC1/2 arm rejected it for unrelated reasons,
which rescued this crystal by accident. What the floor removed was the accident.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EFEJG6WBQv8th4UJFNe53N
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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.

S
Description
Jungfraujoch Data Acquisition System
Readme GPL-3.0
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