6.4

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LorentzCorrection v1

../_images/LorentzCorrection-v1_dlg.png

LorentzCorrection dialog.

Summary

Performs a white beam Lorentz Correction

Properties

Name Direction Type Default Description
InputWorkspace Input MatrixWorkspace Mandatory Input workspace to correct in Wavelength.
OutputWorkspace Output MatrixWorkspace Mandatory An output workspace.
Type Input string SingleCrystalTOF Type of Lorentz correction to do. Allowed values: [‘SingleCrystalTOF’, ‘PowderTOF’]

Description

Multiply the input workspace by the calculated Lorentz factor. The Lorentz correction for time-of-flight single crystal diffraction, L, is calculated according to:

\[L = \frac{\sin^{2}\theta}{\lambda^{4}}\]

Where \(\theta\) is the scattering angle. For time-of-flight powder diffraction it is calculated according to

\[L = \sin{\theta}\]

The calculations performed in this Algorithm are a subset of those performed by the AnvredCorrection v1 for single crystal measurements

Usage

Example - LorentzCorrection

tof = Load(Filename='HRP39180.RAW')
lam = ConvertUnits(InputWorkspace=tof, Target='Wavelength')
corrected = LorentzCorrection(InputWorkspace=lam)

y = corrected.readY(2)
e = corrected.readE(2)
# print first corrected yvalues
print(y[1:5])
# print first corrected evalues
print(e[1:5])

Output:

[ 0.84604876  0.4213364   1.67862035  0.        ]
[ 0.59824681  0.4213364   0.83931018  0.        ]

Categories: AlgorithmIndex | Crystal\Corrections