leonarski_fandClaude Opus 4.8
7b464e4b3c
The profile radius (intrinsic excitation-error width = mosaicity + divergence) was the plain RMS of dist_ewald over indexed spots. With a finite energy bandwidth that spread is broadened by the bandwidth's radial smear sigma_bw = bandwidth_sigma*lambda/(2 d^2), which prediction then re-applies per reflection - so bandwidth was counted twice and the radius was inflated (most at high resolution, sigma_bw ~ 1/d^2). Subtract the bandwidth variance from the measured spread so the radius is the intrinsic width. bandwidth = 0 (monochromatic / rotation) is unchanged. Small for narrow bandwidths (~6% of the variance, ~4% radius on the 1% jet); matters for wide-bandwidth / pink beam. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
20 lines
875 B
C++
20 lines
875 B
C++
// SPDX-FileCopyrightText: 2025 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
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// SPDX-License-Identifier: GPL-3.0-only
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#pragma once
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#include <optional>
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#include <vector>
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#include "../../common/SpotToSave.h"
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std::optional<float> FitProfileRadius_MAD(const std::vector<SpotToSave>& spots);
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// Intrinsic excitation-error (mosaicity+divergence) width from the indexed-spot spread. When a finite
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// energy bandwidth is given, its radial smear (bandwidth_sigma*lambda/(2 d^2)) is deconvolved out, so
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// the result is the intrinsic width and bandwidth is not double-counted by prediction (which re-adds
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// it). bandwidth_sigma = 0 reproduces the plain RMS (monochromatic / rotation).
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std::optional<float> FitProfileRadius(const std::vector<SpotToSave>& spots,
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float bandwidth_sigma = 0.0f, float wavelength_A = 0.0f);
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