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VesuvioPreFit v1

../_images/VesuvioPreFit-v1_dlg.png

VesuvioPreFit dialog.

Summary

Apply preprocessing steps to loaded vesuvio data

Properties

Name

Direction

Type

Default

Description

InputWorkspace

Input

MatrixWorkspace

Mandatory

Input TOF workspace from LoadVesuvio

Smoothing

Input

string

Neighbour

Defines the smoothing method. Allowed values: [‘Neighbour’, ‘None’]

SmoothingOptions

Input

string

NPoints=3

Override the default smoothing options

BadDataError

Input

number

1000000

Mask any data point with an error greater than this value. Set to 0 to turn it off

OutputWorkspace

Output

MatrixWorkspace

Mandatory

The name of the output workspace

Description

Applies the preprocessing steps to loaded vesuvio data before it is fitted. These steps include: - Smoothing the data - Masking bad detectors

Usage

Example - VesuvioPreFit

###### Simulates LoadVesuvio with spectrum number 135-136 #################
tof_ws = CreateSimulationWorkspace(Instrument='Vesuvio',BinParams=[50,0.5,562],UnitX='TOF')
tof_ws = CropWorkspace(tof_ws,StartWorkspaceIndex=134,EndWorkspaceIndex=135) # index one less than spectrum number
tof_ws = ConvertToPointData(tof_ws)
SetInstrumentParameter(tof_ws, ParameterName='t0',ParameterType='Number',Value='0.5')
SetInstrumentParameter(tof_ws, ParameterName='sigma_l1', ParameterType='Number', Value='0.021')
SetInstrumentParameter(tof_ws, ParameterName='sigma_l2', ParameterType='Number', Value='0.023')
SetInstrumentParameter(tof_ws, ParameterName='sigma_tof', ParameterType='Number', Value='0.3')
SetInstrumentParameter(tof_ws, ParameterName='sigma_theta', ParameterType='Number', Value='0.028')
SetInstrumentParameter(tof_ws, ParameterName='hwhm_lorentz', ParameterType='Number', Value='24.0')
SetInstrumentParameter(tof_ws, ParameterName='sigma_gauss', ParameterType='Number', Value='73.0')
# Algorithm allows separate parameters for the foils
SetInstrumentParameter(tof_ws, ComponentName='foil-pos0', ParameterName='hwhm_lorentz',
                       ParameterType='Number', Value='144.0')
SetInstrumentParameter(tof_ws, ComponentName='foil-pos0', ParameterName='sigma_gauss',
                       ParameterType='Number', Value='20.0')
SetInstrumentParameter(tof_ws, ComponentName='foil-pos1', ParameterName='hwhm_lorentz',
                       ParameterType='Number', Value='144.0')
SetInstrumentParameter(tof_ws, ComponentName='foil-pos1', ParameterName='sigma_gauss',
                       ParameterType='Number', Value='20.0')

###########################################################################

pre_fit_workspace = VesuvioPreFit(Inputworkspace=tof_ws, Smoothing="Neighbour",
                                  SmoothingOptions="NPoints=3", BadDataError=-1)

Categories: AlgorithmIndex | Inelastic\Indirect\Vesuvio

Source

Python: VesuvioPreFit.py