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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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