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#5 - Unbond pixels common mode correction

Valid for CsPad and CsPad2x2 -style detectors only!

In latest version of CSPAD (including 2x2) detectors a group of pixels is not bound bonded to relevant electronic channels, so they see no signal. For each 2x1 tile of the detector an averaged signal from unbound these unbonded pixel-channels is used as a common mode variation value. It is subtracted from all other pixels.

Typical common_mode  control parameters:

Code Block
5 50

whereParameters for this algorithm:

  • par[0] - algorithm #,
  • par[1] - maximal allowed common-mode correction value (i.e. don't apply common-mode if computed value exceeds this number).  In other common-mode algorithms this parameter is used to make sure that the common-mode has not been computed using pixels with signal in them.  For this algorithm (that uses unbonded pixels) this parameter is less necessary, since there should never be signal in these pixels, unless there are electronic effects.  One example of such electronic effects: experiments in the MEC hutch often see an electromagnetic-pulse from their high-powered lasers that causes unusual things to happen in the CSPAD readout.  But this is rare in non-MEC experiments.

#6 - Epix neighbor exclusion

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