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DirectILLIntegrateVanadium v1¶

Summary ¶

Integrate vanadium workspace. Part of the TOF workflow at ILL.

Properties ¶

Name	Direction	Type	Default	Description
InputWorkspace	Input	MatrixWorkspace	Mandatory	A workspace to be integrated.
OutputWorkspace	Output	Workspace	Mandatory	The integrated workspace.
Cleanup	Input	string	Cleanup ON	What to do with intermediate workspaces. Allowed values: [‘Cleanup ON’, ‘Cleanup OFF’]
SubalgorithmLogging	Input	string	Logging OFF	Enable or disable subalgorithms to print in the logs. Allowed values: [‘Logging OFF’, ‘Logging ON’]
EPPWorkspace	Input	TableWorkspace	Mandatory	Table workspace containing results from the FindEPP algorithm.
DebyeWallerCorrection	Input	string	Correction ON	Enable or disable the correction for the Debye-Waller factor for OutputWorkspace. Allowed values: [‘Correction ON’, ‘Correction OFF’]
Temperature	Input	number	Optional	Vanadium temperature in Kelvin for Debye-Waller correction, overrides the default value from the sample logs.

Description ¶

This algorithm integrates the workspace given in InputWorkspace using the ComputeCalibrationCoefVan algorithm. It is part of ILL’s direct geometry reduction algorithms.

Note

At the moment, the integration range is fixed to \(\pm\) 3 * FWHM (\(2\sqrt{2 \ln 2}\)) times the ‘Sigma’ column in EPPWorkspace).

The algorithm will also mask detectors for which the integral is zero. This is to prevent vanadium normalization later in the reduction from injecting infinities in the final \(S(Q,\omega)\).

Input workspaces ¶

The InputWorkspace should be loaded using the DirectILLCollectData algorithm. It will also give the EPP workspace needed for EPPWorkspace.

A correction for the Debye-Waller factor is applied to the integrated vanadium, as explained in the documentation of ComputeCalibrationCoefVan. The temperature for the DWF calculation is taken from the sample logs of the InputWorkspace. This value can be overridden by the Temperature property, if needed.