Setup environment

ssh pslogin
ssh psananeh
# or psanafeh for cxi, sxr, and mec
cd <your-directory>
sit_setup

Pedestals

Configuration file for psana with name for example: ana-xpp50312/psana-xpp50312-r0082-pedestals.cfg

[psana]
files   = /reg/d/ana01/xpp/xpp50312/xtc/e178-r0082-s04-c00.xtc
modules = cspad_mod.CsPad2x2Pedestals

[cspad_mod.CsPad2x2Pedestals]
#source = DetInfo(:Cspad2x2)
source = DetInfo(XppGon.0:Cspad2x2.0)
output = cspad-pedestals-ave-xpp50312-r0082.dat
noise  = cspad-pedestals-rms-xpp50312-r0082.dat

Run psana with this configuration file:

psana -c ana-xpp50312/psana-xpp50312-r0082-pedestals.cfg

In a few seconds this command produce two text files with one-dimensional (143560) array for CSPad2x2, which assumes physical shape (185,388,2).
Using, for example, a simple python script this files may be plotted

./PlotCSPad2x2ArrayFromFile.py cspad-pedestals-ave-xpp50312-r0082.dat 700 1400
./PlotCSPad2x2ArrayFromFile.py cspad-pedestals-rms-xpp50312-r0082.dat 0 20

Averaged pedestals:

RMS of pedestals:

Calibration

By default psana assumes that all calibration files are located in the pre-defined directory
/reg/d/psdm/<INSTRUMENT>/<experiment>/calib/
as explained in CsPad calibration in translator#Locating calibration files

However, the calibration directory can be re-defined through the psana parameters.

In order to fulfill the naming conventions we have to create a tree of calibration subdirectories:

ana-xpp50312/calib/CsPad2x2::CalibV1/XppGon.0:Cspad2x2.0/pixel_gain/
                                                         pixel_status/
                                                         pedestals/
                                                         common_mode/

and populate them with all necessary for analysis files. In particular:

cp cspad-pedestals-ave-xpp50312-r0082.dat ana-xpp50312/calib/CsPad2x2::CalibV1/XppGon.0:Cspad2x2.0/pedestals/82-end.data

Another file common_mode/0-end.data usually looks like

1 50 10

Analysis

Configuration script for analysis with psana.
Name for example: ana-xpp50312/psana-xpp50312-r0092.cfg

[psana]
files       = /reg/d/ana01/xpp/xpp50312/xtc/e178-r0092-s04-c00.xtc
experiment  = xpp50312
calib-dir   = ana-xpp50312/calib
events      = 10

modules = cspad_mod.CsPadCalib CSPadPixCoords.CSPad2x2ImageProducer CSPadPixCoords.SaveImageInFile

[cspad_mod.CsPadCalib]
inputKey      = 
outputKey     = calibrated
doPedestals   = yes
doPixelStatus = no
doCommonMode  = yes
doPixelGain   = no

[CSPadPixCoords.CSPad2x2ImageProducer]
source         = DetInfo(:Cspad2x2)
inkey          = calibrated
outimgkey      = Image
tiltIsApplied  = true
print_bits     = 15

[CSPadPixCoords.SaveImageInFile]
source        = DetInfo(:Cspad2x2)
key           = Image
fname         = cspad2x2
eventSave     = 5
#saveAll       = true

This configuration file provides parameters for psana and three modules.
Currently we setup calibration files for cspad_mod.CsPadCalib module for pedestal subtraction and common mode correction.
Module CSPadPixCoords.CSPad2x2ImageProducer produces the CSPad2x2 image and saves it in the event.
Module SaveImageInFile saves indicated image(s) in the file(s).
Playing with doPedestals and doCommonMode parameters, we could get different images:

Raw data without any correction:

Pedestals subtracted:

Pedestals subtracted and common mode corrected: