IndirectFlatPlateAbsorption dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| SampleWorkspace | Input | MatrixWorkspace | Mandatory | Sample workspace |
| SampleChemicalFormula | Input | string | Mandatory | Chemical formula for the sample |
| SampleDensityType | Input | string | Mass Density | Use of Mass density or Number density. Allowed values: [‘Mass Density’, ‘Number Density’] |
| SampleDensity | Input | number | 0.1 | Mass density (g/cm^3) or Number density (atoms/Angstrom^3) |
| SampleHeight | Input | number | 1 | Sample height |
| SampleWidth | Input | number | 1 | Sample width |
| SampleThickness | Input | number | 0.5 | Sample thickness |
| SampleAngle | Input | number | 0 | Sample angle |
| CanWorkspace | Input | MatrixWorkspace | Container workspace | |
| UseCanCorrections | Input | boolean | False | Use can corrections in subtraction |
| CanChemicalFormula | Input | string | Chemical formula for the Container | |
| CanDensityType | Input | string | Mass Density | Use of Mass density or Number density. Allowed values: [‘Mass Density’, ‘Number Density’] |
| CanDensity | Input | number | 0.1 | Mass density (g/cm^3) or Number density (atoms/Angstrom^3) |
| CanFrontThickness | Input | number | 0.1 | Can front thickness |
| CanBackThickness | Input | number | 0.1 | Can back thickness |
| CanScaleFactor | Input | number | 1 | Scale factor to multiply can data |
| BeamHeight | Input | number | 1 | Height of the beam (cm) |
| BeamWidth | Input | number | 1 | Width of the beam (cm) |
| NumberWavelengths | Input | number | 10 | Number of wavelengths for calculation |
| Events | Input | number | 1000 | Number of neutron events |
| OutputWorkspace | Output | MatrixWorkspace | Mandatory | The output corrected workspace |
| CorrectionsWorkspace | Output | WorkspaceGroup | The workspace group to save correction factors |
Calculates and applies corrections for scattering abs absorption in a flat plate sample for a run on an indirect inelastic instrument, optionally allowing for the subtraction or corrections of the container. Uses MonteCarloAbsorption to calculate the corrections.
The correction factor workspace is a workspace group containing the correction
factors in the Paalman and Pings format, note that only 
and
factors are calculated by this algorithm.
Note
To run these usage examples please first download the usage data, and add these to your path. In MantidPlot this is done using Manage User Directories.
Example - Sample corrections for IRIS:
red_ws = LoadNexusProcessed(Filename='irs26176_graphite002_red.nxs')
can_ws = LoadNexusProcessed(Filename='irs26173_graphite002_red.nxs')
corrected, fact = IndirectFlatPlateAbsorption(SampleWorkspace=red_ws,
SampleChemicalFormula='H2-O',
CanWorkspace=can_ws,
CanScaleFactor=0.8,
SampleHeight=1,
SampleWidth=1,
SampleThickness=1,
Events=100,
UseCanCorrections=False)
ass = fact[0]
print ('Corrected workspace is intensity against %s'
% (corrected.getAxis(0).getUnit().caption()))
print ('Ass workspace is %s against %s'
% (ass.YUnitLabel(), ass.getAxis(0).getUnit().caption()))
Output:
Corrected workspace is intensity against Energy transfer
Ass workspace is Attenuation factor against Wavelength
Example - Sample and container corrections for IRIS:
red_ws = LoadNexusProcessed(Filename='irs26176_graphite002_red.nxs')
can_ws = LoadNexusProcessed(Filename='irs26173_graphite002_red.nxs')
corrected, fact = IndirectFlatPlateAbsorption(SampleWorkspace=red_ws,
SampleChemicalFormula='H2-O',
CanWorkspace=can_ws,
CanChemicalFormula='V',
CanScaleFactor=0.8,
SampleHeight=1,
SampleWidth=1,
SampleThickness=1,
Events=100,
UseCanCorrections=True)
ass = fact[0]
acc = fact[1]
print ('Corrected workspace is intensity against %s'
% (corrected.getAxis(0).getUnit().caption()))
print ('Ass workspace is %s against %s'
% (ass.YUnitLabel(), ass.getAxis(0).getUnit().caption()))
print ('Acc workspace is %s against %s'
% (acc.YUnitLabel(), acc.getAxis(0).getUnit().caption()))
Output:
Corrected workspace is intensity against Energy transfer
Ass workspace is Attenuation factor against Wavelength
Acc workspace is Attenuation factor against Wavelength
Categories: AlgorithmIndex | Workflow\Inelastic | CorrectionFunctions\AbsorptionCorrections | Workflow\MIDAS
Python: IndirectFlatPlateAbsorption2.py (last modified: 2018-10-05)