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Dark data processing algorithms include pixel status evaluation which is saved in calibration files of type pixel_status. This note explains how to find definition and statistics of the bad pixel bits.

Finding Bad Pixel status information

The best source of information about bad pixel content and statistics is the log file. Another option is to look at code. Tables in this note contain references to both sources of information for different type of commands/detectors.

LCLS

DetectorDark processing commandLog FilesCode
epix10kaepix10ka_pedestals_calibration

jungfraujungfrau_dark_proc

other detectorscalibrun

LCLS-II

DetectorDark processing commandLog file directoryLog file nameCode
epix10kaepix10ka_pedestals_calibration/cds/group/psdm/detector/gains2/epix10ka/panels/logs/<year>/<time-stamp>_log_epix10ka_pedestals_calibration_<uid>txt
epix100a/opal/etcdet_dark_proc/cds/group/psdm/detector/calib2/epix100/logs/<year>/<time-stamp>_log_det_dark_proc_<uid>.txt

Examples

/cds/group/psdm/detector/calib2/epix100/logs/2022/2022-03-01T071247_log_det_dark_proc_akamalov.txt 
[I] L0230 ________________________________________________________________________________
raw data found/selected in 1000 events
[I] L0233 begin data summary stage
[I] L0279 bad pixel status:
  status  1:      300 pixel rms       > 6.533
  status  2:        1 pixel rms       < 0.001
  status  4:     1434 pixel intensity > 16000 in more than 0.1 fraction of events
  status  8:    10170 pixel intensity < 1 in more than 0.1 fraction of events
  status 16:       31 pixel average   > 5280.34
  status 32:        2 pixel average   < 2692.9
/cds/group/psdm/detector/gains2/epix10ka/panels/logs/2022/2022-04-06T163108_log_epix10ka_pedestals_calibration_xshen.txt 
[I] L0275 Pre-processing time 16.339 sec
Results for median over pixels intensities:
    0.500 fraction of the event spectrum is below 2901.542 ADU - pedestal estimator
    0.050 fraction of the event spectrum is below 2896.826 ADU - gate low limit
    0.950 fraction of the event spectrum is below 2906.187 ADU - gate upper limit
    event spectrum spread    median(abs(raw-med)): 1.869 ADU - spectral peak width estimator
[I] L0361 Bad pixel status:
  status  1:        6 pixel rms       > 3.898
  status  2:        0 pixel rms       < 0.944
  status  4:        0 pixel intensity > 16000 in more than 0.1 fraction of events
  status  8:        0 pixel intensity < 1 in more than 0.1 fraction of events
  status 16:        2 pixel average   > 3821.78
  status 32:        0 pixel average   < 1986.12

References

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