VesuvioPreFit dialog.
Table of Contents
| 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 |
Applys the preprocessing steps to loaded vesuvio data before it is fitted. These steps include: - Smoothing the data - Masking bad detectors
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
Python: VesuvioPreFit.py (last modified: 2017-09-06)