3.7

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

Applys 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: Algorithms | Inelastic\Indirect\Vesuvio