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# SaveNexusPD v1¶

## Summary¶

Save powder diffraction data to a NeXus file

SaveNexus

## Properties¶

Name

Direction

Type

Default

Description

InputWorkspace

Input

Workspace

Mandatory

Workspace to save

OutputFilename

Input

string

Mandatory

Name of the savefile. Allowed extensions: [‘.h5’]

NXentry

Input

string

Overrides the NXentry name from the workspace name

DataType

Input

string

float32

All data saved will be converted to this type. Allowed values: [‘float32’, ‘float64’]

Compression

Input

string

gzip

Algorithm for compressing data. Allowed values: [‘gzip’, ‘lzf’, ‘None’]

WriteMomentumTransfer

Input

boolean

True

Add the momentum transfer (Q) axis to the file

ProtonChargeUnits

Input

string

uA.hour

Allowed values: [‘uA.hour’, ‘C’, ‘pC’]

Append

Input

boolean

False

## Description¶

The file created by this algorithm saves a single workspace in a single NXentry of a NeXus file. The x-axes are saved in time-of-flight, d-spacing, and (optionally) momentum transfer. The file is formatted to support the rules for NXdata, NXdetector, and simple plotting. Fields that appear to be in the file twice are actually hard links to the same object. The format of the file (for a workspace with a single spectrum is described with the tree (starting inside the NXentry)

• NXinstrument

• NXmoderator

• distance - commonly referred to as L1 in diffraction

• NXdetector

• data

• errors

• tof

• dspacing

• Q - values are stored in reverse so they are parallel to the data array

• distance - commonly referred to as L2 in diffraction

• polar_angle - commonly referred to as two-theta in diffraction

• azimuthal_angle - out of plane angle

• NXdata

• data

• errors

• tof

• dspacing

• Q

• proton_charge the accumulated charge for the data

A description of the NeXus coordinate system contains images describing the coordinates.

Categories: AlgorithmIndex | DataHandling\Nexus

## Source¶

Python: SaveNexusPD.py