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LorentzCorrection v1

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Summary

Performs a white beam Lorentz Correction

See Also

AnvredCorrection

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

Source

C++ header: LorentzCorrection.h

C++ source: LorentzCorrection.cpp