Motivation

• 2012-09-13 14:00 - Mtg with Ryan Coffee, Josef Frisch, Nick Hartmann
• Would like to have psana application to process xppi0412 data

Psana configuration file to get image:

[psana]                                                               
files         = \
/reg/d/psdm/xpp/<experiment>/xtc/<file-1>.xtc \ 
/reg/d/psdm/xpp/<experiment>/xtc/<file-2>.xtc \ 
...
/reg/d/psdm/xpp/<experiment>/xtc/<file-N>.xtc 

modules       = \
                 ImgAlgos.CameraImageProducer \
                 ImgAlgos.SaveImageInFile
#                psana_examples.DumpOpal1k \
events          = 3

[ImgAlgos.CameraImageProducer] 
source          = DetInfo(:Opal1000)
key_in          = 
key_out         = img
subtract_offset = true
print_bits      = 15

[ImgAlgos.SaveImageInFile]
source        = DetInfo(:Opal1000)
key           = img
fname         = img-spectra
saveAll       = true
#eventSave     = 1

In order to run this script, the xtc file path and names should be substituted, then use commands:

sit_setup
psana -c <the-name-of-the-configuration-file>

Project of analysis-specific modules

Module producing spectra

Functionality

• Define and cut the spectral regions for signal and reference band.
• Integrate in columns and evaluate two 1024-bin spectra, fs and fr, and their relative difference r= 2(fs-fr)/(fs+fr).
• Put 3 spectra in the event as ndarray<double,2> object.
• Save spectra in the text file, 1024 x 3 lines of float numbers, if necessary.

Module parameters

• source
• key_in
• key_out
• Signal band Y-center
• Signal band width
• Signal band tilt angle
• Reference band Y-center
• Reference band width
• Reference band tilt angle
• Output file name (text format, 1024 x 3 lines of float numbers). If specified, then the file is saved for all selected events.

Module example for analysis of spectra

Functionality

• get the ndarray<double,2> object from the event.
• do iteration over vectors and print elements for example.

  Then users extend this module functionality depending on their goal...

Module parameters

• source
• key_in
• other parameters for analysis or accumulation of statistics etc.