CalMuonDetectorPhases dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| InputWorkspace | Input | MatrixWorkspace | Mandatory | Name of the reference input workspace |
| FirstGoodData | Input | number | Optional | First good data point in units of micro-seconds |
| LastGoodData | Input | number | Optional | Last good data point in units of micro-seconds |
| Frequency | Input | number | Optional | Starting hint for the frequency |
| DetectorTable | Output | TableWorkspace | Mandatory | Name of the TableWorkspace in which to store the list of phases and asymmetries |
| DataFitted | Output | WorkspaceGroup | Mandatory | Name of the output workspace holding fitting results |
Calculates detector asymmetries and phases from a reference dataset. The algorithm fits each of the spectra in the input workspace to:
where 
is shared across spectra and 
and 
are
detector-dependent. The algorithm outputs a table workspace containing the detector ID (i.e. the
spectrum index), the asymmetry and the phase. This table is intended to be used as the input
PhaseTable to PhaseQuad. In addition, the fitting results are returned
in a workspace group, where each of the items stores the original data (after removing the
exponential decay), the data simulated with the fitting function and the difference between data
and fit as spectra 0, 1 and 2 respectively.
There are three optional input properties: FirstGoodData and LastGoodData define the fitting range.
When left blank, FirstGoodData is set to the value stored in the input workspace and LastGoodData
is set to the last available bin. The optional property Frequency allows the user to select an
initial value for . If this property is not supplied, the algortihm takes this
value from the sample_magn_field log multiplied by 
, where 
is
the muon gyromagnetic ratio (0.01355 MHz/G).
Note
To run these usage examples please first download the usage data, and add these to your path. In MantidPlot this is done using Manage User Directories.
Example - CalMuonDetectorPhases
# Load four spectra from a muon nexus file
ws = Load(Filename='MUSR00022725.nxs', SpectrumMin=1, SpectrumMax=4)
# Calibrate the phases and amplituds
detectorTable, fittingResults = CalMuonDetectorPhases(InputWorkspace='ws', LastGoodData=4)
# Print the result
print "Detector 1 has phase %f and amplitude %f" % (detectorTable.cell(0,2), detectorTable.cell(0,1))
print "Detector 2 has phase %f and amplitude %f" % (detectorTable.cell(1,2), detectorTable.cell(1,1))
print "Detector 3 has phase %f and amplitude %f" % (detectorTable.cell(2,2), detectorTable.cell(2,1))
print "Detector 4 has phase %f and amplitude %f" % (detectorTable.cell(3,2), detectorTable.cell(3,1))
Output:
Detector 1 has phase 0.673861 and amplitude 0.133419
Detector 2 has phase 0.452013 and amplitude 0.134742
Detector 3 has phase 0.269103 and amplitude 0.149764
Detector 4 has phase 0.140418 and amplitude 0.153004
Categories: Algorithms | Muon