RemoveLowResTOF v1

../_images/RemoveLowResTOF-v1_dlg.png

RemoveLowResTOF dialog.

Summary

Removes low resolution Time of Flight data.

Properties

Name Direction Type Default Description
InputWorkspace Input MatrixWorkspace Mandatory A workspace with x values in units of TOF and y values in counts
OutputWorkspace Output MatrixWorkspace Mandatory The name of the workspace to be created as the output of the algorithm
LowResTOFWorkspace Output MatrixWorkspace   The name of the optional output workspace that contains low resolution TOF which are removed from input workspace.
ReferenceDIFC Input number Optional The DIFC value for the reference
K Input number 3.22 Some arbitrary number whose default is 3.22 for reasons that I don’t understand
Tmin Input number Optional The minimum time-of-flight of the frame (in microseconds). If not set the data range will be used.
MinWavelength Input number Optional The minimum wavelength for measurement. This overides all other parameters if specified.

Description

The low resolution time-of-flight cutoff is determined by one of two methods. The selection is made based on whether or not MinWavelength is specified.

MinWavelength

If the minimum wavelength is specified, then the mimimum time-of-flight for each pixel is calculated by converting the MinWavelength to time-of-flight using the standard equation found in ConvertUnits v1.

Hodges Criteria

First is calculated the value of dspmap = 1/DIFC. Then the value of

sqrtdmin = \sqrt{T_{min} / DIFC_{ref}} + m_K * \log_{10}(dspmap * DIFC_{ref})

If this is a negative number then the minimum time-of-flight is set to zero. Otherwise it is caculated as

tmin = sqrtdmin * sqrtdmin / dspmap

Categories: Algorithms | Diffraction\Corrections