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Menng's matlab code fraser1.m for Fraser transformation is implemented in python fraser.py
Assumptions in implemented algorithm:
- detector plane is transverse to the beam
- by default image center (sizex/2, sizey/2) coincides with origin for transformation. Non-default center can be set to different point.
Example of diffraction and transformed images:
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Using Kartik's formulas for angles phi and beta kartik-2-peak-ev-angles.py.txt one can get distributions:
In summary:
- angle phi is evaluated using two peak positions and sample-to-detector distance
- angle beta is evaluated using one !!! peak position and angle phi.
- peak and event selection need to be improved
- it could be nice to have explanation to this formalism...
References
- Calibration Management Tool
- Detector alignment tool
- CSPAD Alignment
- Meng's spreadsheet to the runs taken
- Meng's link for the CFEL confluence that has the data analysis summary
- Direct mapping of fiber diffraction patterns into reciprocal space, Norbert Stribeck* and Ulrich Nochel (download)
- Preprocessing averaged XFEL data from adenovirus peptide amyloid and derivation of specimen characteristics, David Wojtas and Rick Millane
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