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Jungfraujoch/image_analysis/bragg_integration
leonarski_fandClaude Opus 4.8 3aec235f67
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integration: add --reciprocal-profile dial (global reciprocal-space width)
The per-shell profile width is learned in pixels, so it varies ~4x with resolution
(mostly the geometric projection of a near-constant reciprocal-space relrod) and must
be binned per shell -> it starves at high resolution / on sparse data. The new
--reciprocal-profile flag instead learns ONE global width in reciprocal space,
sigma2_q,tan = A + B|q| + C|q|^2: the Jacobian g_tan=cos(2theta) removes the geometric
projection, and C|q|^2 is the crystal mosaicity relrod (variance ~(eta|q|)^2). Applied
per reflection as sigma2_tan,px = (A + B|q| + C|q|^2)/g_tan^2 (B,C clamped >=0;
quadratic->linear->constant fallback).

Off by default. On the sharp HEWL test crystal (mosaicity 0.091deg, so C fits to ~0 and
it reduces to the validated linear form) it is metric-neutral: ISa 16.2->16.3, anomalous
0.92x unchanged, CCref band 90.0->89.9, CC1/2 a touch lower (per-shell isn't starved at
23k spots/shell, and a global fit is less flexible). So: simpler + more transferable at a
small CC1/2 cost, ISa/anomalous held. Its payoff is on MOSAIC crystals (large C|q|^2),
where per-shell starves on the wide weak high-res spots and 6 shells are too coarse; both
lyso test crystals are sharp, so it ships as a dial to try on mosaic data elsewhere.
A separate radial relrod fit was tried and dropped (no gain). See NEXTGEN_INTEGRATOR.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-30 14:26:08 +02:00
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