3.6

IndirectILLReduction v1

../_images/IndirectILLReduction-v1_dlg.png

IndirectILLReduction dialog.

Summary

Performs an energy transfer reduction for ILL indirect inelastic data.

Properties

Name Direction Type Default Description
Run Input string Mandatory File path of run. Allowed values: [‘nxs’]
CalibrationWorkspace Input MatrixWorkspace   Workspace containing calibration intensities.
Analyser Input string silicon Analyser crystal. Allowed values: [‘silicon’]
Reflection Input string 111 Analyser reflection. Allowed values: [‘111’]
MapFile Input string   Filename of the map file to use. If left blank the default will be used. Allowed values: [‘xml’]
MirrorMode Input boolean False Whether to use mirror mode.
RawWorkspace Output MatrixWorkspace Mandatory Name for the output raw workspace created.
ReducedWorkspace Output MatrixWorkspace Mandatory Name for the output reduced workspace created. If mirror mode is used this will be the sum of both the left and right hand workspaces.
LeftWorkspace Output MatrixWorkspace   Name for the left workspace if mirror mode is used.
RightWorkspace Output MatrixWorkspace   Name for the right workspace if mirror mode is used.
Save Input boolean False Switch Save result to nxs file Off/On.
Plot Input boolean False Whether to plot the output workspace.

Description

A workflow algorithm to perform a data reduction for Indirect ILL instruments.

Note that currently only IN16B is supported.

Mirror Mode

When IN16B records data in mirror mode the spectra for the acceleration and deceleration phase of the Doppler drive are recorded separately, the result is each spectra containing two regions for the same energy range.

Enabling MirrorMode on this algorithm will split the data for each spectrum into two separate spectra, these form the “left” and “right” workspaces that are reduced independently and then summed.

Usage

Example - Running IndirectILLReduction

IndirectILLReduction(Run='ILLIN16B_034745.nxs',
                     RawWorkspace='raw_workspace',
                     ReducedWorkspace='reduced_workspace')

print "Reduced workspace has %d spectra" % mtd['reduced_workspace'].getNumberHistograms()
print "Raw workspace has %d spectra" % mtd['raw_workspace'].getNumberHistograms()

Output:

Reduced workspace has 24 spectra
Raw workspace has 2057 spectra

Example - Running IndirectILLReduction in mirror mode

IndirectILLReduction(Run='ILLIN16B_034745.nxs',
                     RawWorkspace='raw_workspace',
                     ReducedWorkspace='reduced_workspace',
                     LeftWorkspace='reduced_workspace_left',
                     RightWorkspace='reduced_workspace_right',
                     MirrorMode=True)

print "Raw workspace has %d spectra" % mtd['raw_workspace'].getNumberHistograms()
print "Reduced workspace has %d spectra" % mtd['reduced_workspace'].getNumberHistograms()
print "Reduced left workspace has %d spectra" % mtd['reduced_workspace_left'].getNumberHistograms()
print "Reduced right workspace has %d spectra" % mtd['reduced_workspace_right'].getNumberHistograms()

Output:

Raw workspace has 2057 spectra
Reduced workspace has 24 spectra
Reduced left workspace has 24 spectra
Reduced right workspace has 24 spectra

Categories: Algorithms | Workflow\MIDAS | Inelastic\Reduction