====== Processing actual multigrain diffraction data from a diamond anvil cell experiment =====

That's it, you have been [[processing:workflow_training|trained in multigrain XRD data processing]]. You feel that you are ready for real data from a diamond anvil cell experiments!

Tough parts with diamond anvil cell data include
  * shadows from the DAC itself,
  * Compton background from the diamond anvils,
  * single-crystal diffraction from the diamond anvils,
  * typically, unknown phases and cell parameters,
  * poor diffraction quality.

Obviously, unlike data from simulations, you do not know the answer! You do not know the grains you will be looking!

===== Workflow outline =====

Here is a simple outline of what you should do:
  - Calibrate your experiment. This should be done with either [[software:dioptas|Dioptas]] or [[software:fit2d|Fit2D]]. Beam centers and detector distances you find in Dioptas or Fit2D will be used at a later stage of the processing.
  - Understand the [[dac_experiments:geometry|concept of an O-Matrix]] and figure out your own.
  - We often also calibrate [[software:Maud|Maud]] as this point. We will use it later to figure out the cell parameters of our sample. As you start using MAUD keep a note of the parameters you use to convert your tiff images into ESG. You will need to use exactly the same ones on your sample images later.
  - Later, for each P/T point you wish to study
     * [[processing:remove_bad_images|Remove bad images]] and replace them with either the average of the two surrounding images or create an empty image,
     * Calculate an average and a median image,
     * Use MAUD or Dioptas or anything else to identify your phases and their cell parameters. We often work on the average images to do so,
     * [[processing:clean-diamond-anvil-cell-data|Clean up your data]] for diamond diffraction spots, DAC shadows, etc
     * [[processing:search_for_peaks|Search for peaks]],
     * [[processing:compute_gvectors|Calculate your G-Vectors]],
     * [[processing:indexing_with_grainspotter|Index your grains with GrainSpotter!]]
     * [[processing:peakremoval|Treat side phases first (e.g. pressure medium, pressure marker, other phases)]]
     * ...

{{:processing:general_data_processing_flow_chart_.png?600|Data processing flow chart}}