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SaveSESANS v1

Summary

Save a file using the SESANS format

See Also

LoadSESANS

Properties

Name

Direction

Type

Default

Description

InputWorkspace

Input

MatrixWorkspace

Mandatory

The name of the workspace to save

Filename

Input

string

Mandatory

The name to use when saving the file. Allowed extensions: [‘.ses’, ‘.sesans’]

ThetaZMax

Input

number

Optional

The angular acceptance in the encoding direction

ThetaZMaxUnit

Input

string

radians

ThetaYMax

Input

number

Optional

The angular acceptance in the non-encoding direction

ThetaYMaxUnit

Input

string

radians

EchoConstant

Input

number

Optional

The spin echo length, in nanometers, probed by a 1A neutron

Sample

Input

string

Sample name

Orientation

Input

string

Z

Orientation of the instrument. Allowed values: [‘X’, ‘Y’, ‘Z’]

OverrideSampleThickness

Input

number

Optional

The sample thickness in mm. If set, this value will be used instead of the thickness from the input workspace sample

Description

Saves the given workspace to a file which will be formatted in the SESANS data format. A workspace with a single spectrum is expected, where the X values are wavelength and the Y values are polarisation.

The sample thickness from the run metadata is used to normalise the polarisation data. The OverrideSampleThickness parameter can be used to specify a different value for this if needed.

Usage

Example - Loading a file

import os

# Create dummy workspace with sample thickness metadata
dataX = [1,2,3,4,5]
dataY = [6,1,9,14]
dataE = [1,1,4,5]
out_ws = CreateWorkspace(dataX, dataY, dataE)
out_ws.setTitle("Dummy workspace")
out_ws.sample().setThickness(10)

file_path = os.path.join(config["defaultsave.directory"], "example.ses")

# Do a 'roundtrip' of the data
SaveSESANS(InputWorkspace=out_ws, Filename=file_path, ThetaZMax=1,ThetaYMax=1, EchoConstant=1, Sample="Sample")
LoadSESANS(Filename=file_path, OutputWorkspace="in_ws")

# Retrieve loaded workspace from ADS
in_ws = mtd["in_ws"]
print("Y values of loaded workspace = " + str(in_ws.readY(0)))

Output:

Y values of loaded workspace = [0.796338 0.       0.179365 0.130324]

Categories: AlgorithmIndex | DataHandling\Text

Source

C++ header: SaveSESANS.h

C++ source: SaveSESANS.cpp