3.3.2.13. NXsastofΒΆ

Status:

application definition, extends NXobject, version 1.0b

Description:

This is an application definition for small angle scattering using a 2D detector in TOF mode.

It strives to cover all the SAS techniques in the file again

Symbols:

No symbol table
Groups cited:
NXcollimator, NXdata, NXdetector, NXentry, NXgeometry, NXinstrument, NXmonitor, NXsample, NXshape, NXsource

Structure:

(entry): NXentry

@entry: NX_CHAR

NeXus convention is to use “entry1”, “entry2”, ... for analysis software to locate each entry

title: NX_CHAR

start_time: NX_DATE_TIME

definition: NX_CHAR

Official NeXus NXDL schema to which this file conforms

Obligatory value: NXsastof

instrument: NXinstrument

name: NX_CHAR

Name of the instrument actually used to perform the experiment

source: NXsource

type: NX_CHAR

type of radiation source

name: NX_CHAR

Name of the radiation source

probe: NX_CHAR

Any of these values: neutron | x-ray

collimator: NXcollimator

geometry: NXgeometry

shape: NXshape

shape: NX_CHAR

Any of these values: nxcylinder | nxbox

size: NX_FLOAT {units=NX_LENGTH}

The collimation length

detector: NXdetector

data[nXPixel, nYPixel, nTOF]: NX_NUMBER

This is area detector data, of number of x-pixel versus number of y-pixels. Since the beam center is to be determined as a step of data reduction, it is not necessary to document or assume the position of the beam center in acquired data.

time_of_flight[nTOF]: NX_FLOAT {units=NX_TIME_OF_FLIGHT}

distance: NX_FLOAT {units=NX_LENGTH}

The distance between detector and sample

x_pixel_size: NX_FLOAT {units=NX_LENGTH}

Physical size of a pixel in x-direction

y_pixel_size: NX_FLOAT {units=NX_LENGTH}

Size of a pixel in y direction

polar_angle: NX_FLOAT {units=NX_ANGLE}

azimuthal_angle: NX_FLOAT {units=NX_ANGLE}

rotation_angle: NX_FLOAT {units=NX_ANGLE}

aequatorial_angle: NX_FLOAT {units=NX_ANGLE}

beam_center_x: NX_FLOAT {units=NX_LENGTH}

This is the x position where the direct beam would hit the detector. This is a length, not a pixel position, and can be outside of the actual detector.

beam_center_y: NX_FLOAT {units=NX_LENGTH}

This is the y position where the direct beam would hit the detector. This is a length, not a pixel position, and can be outside of the actual detector.

sample: NXsample

name: NX_CHAR

Descriptive name of sample

aequatorial_angle: NX_FLOAT {units=NX_ANGLE}

control: NXmonitor

mode: NX_CHAR

Count to a preset value based on either clock time (timer) or received monitor counts (monitor).

Any of these values: monitor | timer

preset: NX_FLOAT

preset value for time or monitor

data[nTOF]: NX_INT

time_of_flight[nTOF]: NX_FLOAT {units=NX_TIME_OF_FLIGHT}

data: NXdata

data –> /NXentry/NXinstrument/NXdetector/data

time_of_flight –> /NXentry/NXinstrument/NXdetector/time_of_flight

NXDL Source:
https://github.com/nexusformat/definitions/blob/master/applications/NXsastof.nxdl.xml