DiffractionFocussing support for Q

[Peter Peterson]

DiffractionFocussing should support input workspaces in Q (read: momentum transfer) as well as d-spacing since they have some requirements on the data being commensurate.

This will help with processing data for PDF reduction.

[Wenduo Zhou]

(In [12559]) Changed DiffractionFocussing2 such that it can support Q-space data. Fixes #3065.

[Janik Zikovsky]

The following scripts shows a fairly significant difference between the Workspace2D and event versions of the algorithm:

# 2D version
LoadEventNexus(Filename="/home/8oz/data/PG3_1370_event.nxs",OutputWorkspace="pg3",CompressTolerance="0.050000000000000003")
ConvertUnits(InputWorkspace="pg3",OutputWorkspace="pg3",Target="MomentumTransfer")
Rebin(InputWorkspace="pg3",OutputWorkspace="pg3",Params="0,1,40")
CreateGroupingWorkspace(InstrumentName="PG3",GroupNames="bank124,bank144,bank164,bank184",OutputWorkspace="pg3_group")
ConvertToMatrixWorkspace(InputWorkspace="pg3",OutputWorkspace="pg32d")
DiffractionFocussing(InputWorkspace="pg32d",OutputWorkspace="pg3_foc_2d",GroupingWorkspace="pg3_group")

# Event version
CreateGroupingWorkspace(InstrumentName="PG3",GroupNames="bank124,bank144,bank164,bank184",OutputWorkspace="pg3_group")
DiffractionFocussing(InputWorkspace="pg3",OutputWorkspace="pg3_foc",GroupingWorkspace="pg3_group")

Minus("pg3_foc", "pg3_foc_2d", "pg3_diff")

If you compare pg3_foc and pg3_foc_2d on a plot, they look pretty different. I'm not sure if this is specific to Q; or if it has something to do with Martyn's "fixes" to spectrum numbers. Maybe this should reopen a new ticket?

[Nick Draper]

New ticket #3285 created to deal with this.

[Owen Arnold]

Issues raised by Janik Zikovsky in dedicated ticket #3285

[Stuart Campbell]

This ticket has been transferred to github issue ​3912