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ElasticWindowMultiple v1

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Summary

Performs the ElasticWindow algorithm over multiple input workspaces

Properties

Name	Direction	Type	Default	Description
InputWorkspaces	Input	WorkspaceGroup	Mandatory	Grouped input workspaces
IntegrationRangeStart	Input	number	0	Start of integration range in time of flight
IntegrationRangeEnd	Input	number	0	End of integration range in time of flight
BackgroundRangeStart	Input	number	Optional	Start of background range in time of flight
BackgroundRangeEnd	Input	number	Optional	End of background range in time of flight
SampleEnvironmentLogName	Input	string	sample	Name of the sample environment log entry
SampleEnvironmentLogValue	Input	string	last_value	Value selection of the sample environment log entry. Allowed values: [‘last_value’, ‘average’]
OutputInQ	Output	Workspace	Mandatory	Output workspace in Q
OutputInQSquared	Output	Workspace	Mandatory	Output workspace in Q Squared
OutputELF	Output	Workspace		Output workspace ELF
OutputELT	Output	Workspace		Output workspace ELT

Description

This algorithm performs the ElasticWindow algorithm over a set of workspaces provided as a workspace group, the binning of each workspace must match.

The Q and Q-squared output workspaces show the output of ElasticWindow for each input workspace, the ELF workspace shows the data transposed with the X axis in either sample temperature or run number of temperature is not available.

The ELT workspace shows the normalisation of the ELF workspace to run with the lowest sample temperature.

Workflow

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Usage

# This test needs the facility to be set to ISIS to load the IRIS instrument
facility = config['default.facility']
config['default.facility'] = 'ISIS'

# Create some sample data
widths = [15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0]
for idx, fwhm in enumerate(widths):
    ws_name = 'ws_%.1f' % fwhm
    function = 'name=Lorentzian,Amplitude=100,PeakCentre=27500,FWHM=%f' % fwhm
    CreateSampleWorkspace(Function='User Defined',
                          UserDefinedFunction=function,
                          XMin=27000,
                          XMax=28000,
                          BinWidth=10,
                          NumBanks=1,
                          OutputWorkspace=ws_name)

    ConvertUnits(InputWorkspace=ws_name,
                 OutputWorkspace=ws_name,
                 Target='DeltaE',
                 EMode='Indirect',
                 EFixed=1.555)

    Rebin(InputWorkspace=ws_name,
           OutputWorkspace=ws_name,
           Params=[-0.2,0.004,0.2])

    LoadInstrument(Workspace=ws_name,
                   InstrumentName='IRIS', RewriteSpectraMap=True)

    SetInstrumentParameter(Workspace=ws_name,
                           ParameterName='Efixed',
                           DetectorList=range(1,113),
                           ParameterType='Number',
                           Value='1.555')

    mtd[ws_name].mutableRun()['run_number'] = idx + 1

input = GroupWorkspaces(InputWorkspaces=['ws_%.1f' % fwhm for fwhm in widths])

# Run the algorithm
q, q2, elf = ElasticWindowMultiple(input, -0.1, 0.1)

print('ELF X axis: %s' % elf.getAxis(0).getUnit().caption())
print('ELF spectra count: %d' % elf.getNumberHistograms())
print('ELF bin count: %d' % elf.blocksize())

# Reset the facility to the original setting
config['default.facility'] = facility

ELF X axis: Run No
ELF spectra count: 100
ELF bin count: 7

Categories: AlgorithmIndex | Workflow\Inelastic | Inelastic\Indirect

Source

Python: ElasticWindowMultiple.py