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Test of common mode correction for CSPAD

Use Here we use cxi83714-r0136: lysozyme crystallography data with bright bragg spots on top of a varying water background.  We use these common-mode parameters (turning off the fall-back unbonded correction):

1 10 10 100

Spectra for 1) raw data, 2) subtracted pedestals, 3) subtracted common mode correction algorithm #1:

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This is the same plot for an event with many photons.  The t.time() line refers to the timestamp of a particular event.  There is one entry in the plot for the common-mode value for each tile of the CSPAD.

dataset_name = "exp=cxid9114:run=96:idx"
if t.time() == 6025277111415285948L:

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Common mode histogram using algorithm 5

Thoughts from Phil on complexities involved with CsPad Common Mode:

• statistics of unbonded pixels is a problem
• poisson statistics on bragg spots is bigger than the common mode
• don't correct common-mode for low-gain pixels
• the larger shifts seen in bright events are "cross-talk" caused by the "ramp" where pixels nearer the mean-pedestal have a lower gain
• should do per-asic common-mode
• should do algorithm 5, then algorithm 1 if it fails

Summary for CSPAD

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• mode

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Test of common mode correction for CSPAD2x2

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