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# ConvertWANDSCDtoQ v1¶

## Summary¶

Convert the output of LoadWANDSCD to Q or HKL

## Properties¶

Name

Direction

Type

Default

Description

InputWorkspace

Input

IMDHistoWorkspace

Mandatory

Input Workspace

NormalisationWorkspace

Input

IMDHistoWorkspace

Workspace to use for normalisation

UBWorkspace

Input

Workspace

Workspace containing the UB matrix to use

Wavelength

Input

number

1.488

Wavelength to set the workspace

S1Offset

Input

number

0

Offset to apply (in degrees) to the s1 of the input workspace

NormaliseBy

Input

string

Monitor

Normalise to monitor, time or None. Allowed values: [‘None’, ‘Time’, ‘Monitor’]

Frame

Input

string

Q_sample

Selects Q-dimensions of the output workspace. Allowed values: [‘Q_sample’, ‘HKL’]

Uproj

Input

dbl list

1,0,0

Defines the first projection vector of the target Q coordinate system in HKL mode

Vproj

Input

dbl list

0,1,0

Defines the second projection vector of the target Q coordinate system in HKL mode

Wproj

Input

dbl list

0,0,1

Defines the third projection vector of the target Q coordinate system in HKL mode

BinningDim0

Input

dbl list

-8.02,8.02,401

Binning parameters for the 0th dimension. Enter it as acomma-separated list of values with theformat: ‘minimum,maximum,number_of_bins’.

BinningDim1

Input

dbl list

-0.82,0.82,41

Binning parameters for the 1st dimension. Enter it as acomma-separated list of values with theformat: ‘minimum,maximum,number_of_bins’.

BinningDim2

Input

dbl list

-8.02,8.02,401

Binning parameters for the 2nd dimension. Enter it as acomma-separated list of values with theformat: ‘minimum,maximum,number_of_bins’.

KeepTemporaryWorkspaces

Input

boolean

False

If True the normalization and data workspaces in addition to the normalized data will be outputted

ObliquityParallaxCoefficient

Input

number

1

Geometrical correction for shift in vertical beam position due to wide beam.

OutputWorkspace

Output

Workspace

Mandatory

Output Workspace

## Description¶

This algorithm will convert the output of LoadWANDSCD v1 in either Q or HKL space. FindPeaksMD v1 can be run on the output Q sample space, then the UB can be found and used to then convert to HKL. The default binning ranges are good for converting to Q sample with the default wavelength.

This algorithm will also work for data from DEMAND (HB3A).

The normalization is calculated in the same way as MDNormSCD v1 but with the solid angle and flux coming from the NormalisationWorkspace, normally vanadium. A brief introduction to the multi-dimensional data normalization can be found here.

When converting to HKL it will use the UB matrix from the UBWorkspace if provided otherwise it will use the UB matrix from the InputWorkspace. Uproj, Vproj and Wproj are only used when converting to HKL Frame.

If the KeepTemporaryWorkspaces option is True the data and the normalization in addition to the nomalized data will be outputted. This allows you to run separate instances of ConvertWANDSCDtoQ and combine the results. They will have names “ws_data” and “ws_normalization” respectively.

## Usage¶

Convert to Q

# Load Data and normalisation
ConvertWANDSCDtoQ(InputWorkspace='data',
NormalisationWorkspace='norm',
OutputWorkspace='Q',
BinningDim1='-1,1,1')

# Plot workspace
import matplotlib.pyplot as plt
from mantid import plots
fig, ax = plt.subplots(subplot_kw={'projection':'mantid'})
c = ax.pcolormesh(mtd['Q'], vmax=1)
cbar=fig.colorbar(c)
cbar.set_label('Intensity (arb. units)')
#fig.savefig('ConvertWANDSCDtoQ_Q.png')


Output:

Convert to HKL

# Load Data and normalisation
SetUB('data', UB='0,0.1770619741,-0.00927942487,0.177304965,0,0,0,-0.00927942487,-0.177061974')
ConvertWANDSCDtoQ(InputWorkspace='data',
NormalisationWorkspace='norm',
OutputWorkspace='HKL',
Frame='HKL',
BinningDim0='-1,1,1',
BinningDim1='-2.02,7.02,226',
BinningDim2='-6.52,2.52,226')

# Plot workspace
import matplotlib.pyplot as plt
from mantid import plots
fig, ax = plt.subplots(subplot_kw={'projection':'mantid'})
c = ax.pcolormesh(mtd['HKL'], vmax=1)
cbar=fig.colorbar(c)
cbar.set_label('Intensity (arb. units)')
#fig.savefig('ConvertWANDSCDtoQ_HKL.png')


Output:

Categories: AlgorithmIndex | DataHandling\Nexus

## Source¶

Python: ConvertWANDSCDtoQ.py