Changelog entries for the three changes above, and a new CPU_DATA_ANALYSIS
section on determining detector geometry from powder rings: why a ring is an
independent constraint on the beam centre (it has no crystal orientation to be
gauge-coupled to, unlike everything else that fits geometry here), what a ring
can and cannot determine, and how the ring points are obtained.
The section states the harmonics correctly, which is worth writing down because
the intuitive version is wrong: a detector tilt shows up as cos(phi), the same
harmonic as a beam-centre error, and the two are separated by the amplitude
growing as the ring radius SQUARED - so it takes at least two rings, and on one
ring they are exactly degenerate. The genuine cos(2 phi) term is hundredths of a
pixel.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
leonarski_fandClaude Opus 5
3d4209d803
