MuscatData v1¶

../_images/MuscatData-v1_dlg.png — MuscatData dialog.¶

Summary ¶

Calculates multiple scattering using a sample S(Q,w).

Properties ¶

Name	Direction	Type	Default	Description
Instrument	Input	string	iris	Instrument. Allowed values: [‘irs’, ‘iris’, ‘osi’, ‘osiris’]
Analyser	Input	string	graphite002	Allowed values: [‘graphite002’, ‘graphite004’]
Geom	Input	string	Flat	Sample geometry. Allowed values: [‘Flat’, ‘Cyl’]
SamNumber	Input	string	Mandatory	Sample data run number
SqwInput	Input	string	Mandatory	Sqw file run number
NR1	Input	number	1000	MonteCarlo neutrons NR1. Default=1000
NR2	Input	number	1000	MonteCarlo neutrons NR2. Default=1000
Nms	Input	number	1	Number of scatterings. Default=1
DetAngle	Input	number	90	Detector angle. Default=90.0
Thick	Input	string	Mandatory	Sample thickness
Width	Input	string	Mandatory	Sample width
Height	Input	number	3	Sample height. Default=3.0
Density	Input	number	0.1	Sample number density. Default=0.1
SigScat	Input	number	5	Scattering cross-section. Default=5.0
SigAbs	Input	number	0.1	Absorption cross-section. Default=0.1
Temperature	Input	number	300	Sample temperature (K). Default=300.0
Plot	Input	string	None	Allowed values: [‘None’, ‘Totals’, ‘Scat1’, ‘All’]
Verbose	Input	boolean	True	Switch Verbose Off/On
Save	Input	boolean	False	Switch Save result to nxs file Off/On

Description ¶

Calculates Multiple Scattering based on the Monte Carlo program MINUS. It takes a sample $S (Q, w)$ from an input sqw workspace and supports both Flat and Cylindrical geometries. More information on the multiple scattering can be procedure can be found in the modes manual.

References ¶

M W Johnson, AERE Report R7682 (1974)

Usage ¶

Example - a basic example using MuscatData.

def createSampleWorkspace(name, random=False):
        """ Creates a sample workspace with a single lorentzian that looks like IRIS data"""
        import os
        function = "name=Lorentzian,Amplitude=8,PeakCentre=5,FWHM=0.7"
        ws = CreateSampleWorkspace("Histogram", Function="User Defined", UserDefinedFunction=function, XUnit="DeltaE", Random=True, XMin=0, XMax=10, BinWidth=0.01)
        ws = CropWorkspace(ws, StartWorkspaceIndex=0, EndWorkspaceIndex=9)
        ws = ScaleX(ws, -5, "Add")
        ws = ScaleX(ws, 0.1, "Multiply")

        #load instrument and instrument parameters
        LoadInstrument(ws, InstrumentName='IRIS')
        path = os.path.join(config['instrumentDefinition.directory'], 'IRIS_graphite_002_Parameters.xml')
        LoadParameterFile(ws, Filename=path)
        ws = RenameWorkspace(ws, OutputWorkspace=name)
        return ws


ws = createSampleWorkspace("irs26173_graphite002_red", random=True)
sqw = SofQW(ws, QAxisBinning='2,1,10', Emode='Indirect', OutputWorkspace="irs26173_graphite002_sqw")
SaveNexus(ws, "irs26173_graphite002_red.nxs")
SaveNexus(sqw, "irs26173_graphite002_sqw.nxs")

MuscatData(SamNumber='26173', SqwInput='26173', Thick='0.5', Width='0.5', Instrument='irs')

Categories: AlgorithmIndex | Workflow\MIDAS

Source ¶

Python: MuscatData.py