4.2

EQSANSResolution v1

../_images/EQSANSResolution-v1_dlg.png

EQSANSResolution dialog.

Summary

Calculate the Q resolution for EQSANS data.

Properties

Name Direction Type Default Description
InputWorkspace InOut MatrixWorkspace Mandatory Name the workspace to calculate the resolution for
ReducedWorkspace Input MatrixWorkspace Mandatory I(Q) workspace
OutputBinning Input dbl list Mandatory  
MinWavelength Input number Optional Minimum wavelength to use.
MaxWavelength Input number Optional Maximum wavelength to use.
PixelSizeX Input number 5.15 Pixel size in the X direction (mm).
PixelSizeY Input number 5.15 Pixel size in the Y direction (mm).
SampleApertureRadius Input number 5 Sample aperture radius (mm).
SourceApertureRadius Input number 10 Source aperture radius (mm).
DeltaT Input number 250 TOF spread (microsec).

Description

This algorithm extends the TOFSANSResolution to implement the experimentally determined TOF resolution for EQSANS.

The Q resolution for a TOF SANS has two components: a geometrical contribution and a contributions from the resolution in TOF.

The TOF resolution for EQSANS was measured to be:

\Delta T = y_0 + A ( f/(1+\exp((\lambda-x^0_1)/k_1)) + (1-f)/(1+\exp((\lambda-x^0_2)/k_2)) )

where \lambda is the wavelength and

y_0 = -388

A = 3838

f = 0.04398

x^0_1 = 3.392

x^0_2 = 134.3

k_1 = -0.5587

k_2 = -65.46

This algorithm is generally not called directly. It’s called by EQSANSAzimuthalAverage1D after the calculation of I(Q). It can only be applied to an I(Q) workspace.

Categories: AlgorithmIndex | SANS

Source

C++ source: EQSANSResolution.cpp (last modified: 2018-10-05)

C++ header: EQSANSResolution.h (last modified: 2018-10-05)