AlignAndFocusPowderFromFiles v1¶

Summary¶

The algorithm used for reduction of powder diffraction data

Properties¶

Description¶

This is a workflow algorithm that wraps AlignAndFocusPowder to perform a double loop over files with chunks, accumulating the result. The additional properties from what is allowed in AlignAndFocusPowder is for how the file is loaded (e.g. MaxChunkSize and FilterBadPulses), an optional Characterizations table, and an optional AbsorptionWorkspace. The AbsorptionWorkspace should be in units of Wavelength for every detector pixel and is divided from the chunk after loaded. For all other information, see AlignAndFocusPowder.

In broad terms, this algorithm is the pseudo-code:

for filename in filenames:
    cachefile = CreateCacheFilename(filename, ...)
    if cachefile exists:
        wksp_single = LoadNexusProcessed(cachefile)
    else:
        for chunk in DetermineChunking(filename):
            wksp_single_chunk = Load(chunk)
            wksp_single_chunk = AlignAndFocusPowder(wksp_single_chunk, ...)
        # accumulate chunks into wksp_single
        SaveNexusProcess(wksp_single, cachefile)
    # accumulate data from files into OutputWorkspace

Algorithms used by this are:

1. AlignAndFocusPowder v1
2. CompressEvents v1
3. ConvertUnits v1
4. CreateCacheFilename v1
5. DeleteWorkspace v1
6. DetermineChunking v1
7. Divide v1
8. EditInstrumentGeometry v1
9. FilterBadPulses v1
10. Load v1
11. LoadNexusProcessed v1
12. PDDetermineCharacterizations v1
13. Plus v1
14. RenameWorkspace v1
15. SaveNexusProcessed v1

Categories: Algorithms | Diffraction\Reduction

Source¶

Python: AlignAndFocusPowderFromFiles.py