Diffraction Changes¶

Engineering Diffraction¶

• Introduction of new Engineering Diffraction interface. Currently supports calibration and focusing for ENGINX. Fitting functionality is currently under development.

Powder Diffraction¶

Several improvements have been made to the total scattering functionality in the Polaris powder diffraction scripts. The following changes relate specifically to the create_total_scattering_pdf function:

• Merging banks now matches spectra to the spectrum with the largest x range.
• Merging banks no longer matches spectra with scale, it now only matches with offset.
• It can now be given a parameter output_binning that will be used to rebin the output_pdf.
• It can now accept a pdf_type argument to set the pdf_output type.
• It can now accept a freq_params argument to perform a fourier filter on the run.
• A SaveRMCProfile algorithm has been made that saves workspaces in a format readable by the RMCProfile package.

The following changes have also been made to other parts of the power diffraction scripts:

• HRPDSlabCanAbsorption now accepts any thickness parameter and not those in a specified list.

Engineering Diffraction¶

• EnggCalibrateFull now uses the new SaveAscii to save its output files as TSVs, allowing them to be loaded back into Mantid.
• FitPeaks allows for specifying some of the peak parameters (e.g. only Mixing for PseudoVoigt) and observing the other parameters. The new functionality allows for more automated execution for peak functions other than Gaussian.
• Instrument Definition File for HFIR HB2B (HiDRA) has been added.

Single Crystal Diffraction¶

• PredictFractionalPeaks now accepts the same set of modulation vector properties as IndexPeaks.
• New algorithm ConvertHFIRSCDtoMDE for converting HFIR single crystal data (from WAND and DEMAND) into MDEventWorkspace in units Q_sample.

• The output peak workspace from PredictFractionalPeaks now keeps the same lattice parameters as the input workspace.
• SaveReflections now has the option to save peaks to separate files based on their associated modulation vectors when using the Jana format.
• IndexPeaksWithSatellites has been deleted as it had been deprecated and superseded by IndexPeaks.

Miscellaneous¶

• LoadILLTOF2 now supports loading data taken from PANTHER in diffraction mode.
• A unit AtomicDistance measured in units of Angstrom has been added to the unit factory to describe atomic structure. The initial use of this is in the pair distribution functions generated by the Polaris scripts

Powder Diffraction¶

• Unicode strings can now be given as a lim file directory in polaris create_total_scattering_pdf merging banks.
• Polaris.focus no longer fails with do_absorption_Corrections=True.
• Empty runs are no longer subtracted twice when specifying sample_empty in Polaris.focus.
• Lists can now be given for q_lims in polaris create_total_scattering_pdf while merging banks.
• SavePDF no longer fails when asked to save histogram data
• Bug fixed affecting Diffraction > Powder Diffraction Reduction interface - only facilities with applicable instruments can now be selected.

Single Crystal Diffraction¶

• Support added for DEMAND (HB3A) to the algorithms ConvertWANDSCDtoQ and FindPeaksMD in order to handle additional goniometers.
• Fixed PredictSatellitePeaks producing an empty table when using cross-terms with crystallography convention for sign of Q.
• Two fixes to IntegrateEllipsoids and IntegrateEllipsoidsTwoStep. For non Event mode data the algorithms now:
  • calculate the count-weighted variance as required.
  • return the correct error on the integrated intensity.

Miscellaneous¶

• Fixed a bug where SaveGSS could crash when attempting to pass a group workspace into it. GSS files are produced by the focus functionality in the powder diffraction scripts and also the EnginX scripts

Release 5.0.0