application definition, extends NXobject


This is the application definition for a TOF laue diffractometer


No symbol table

Groups cited:

NXdata, NXdetector, NXentry, NXinstrument, NXmonitor, NXsample


entry: (required) NXentry

definition: (required) NX_CHAR

Official NeXus NXDL schema to which this file conforms

Obligatory value: NXlauetof

instrument: (required) NXinstrument

detector: (required) NXdetector

This assumes a planar 2D detector. All angles and distances refer to the center of the detector.

polar_angle: (required) NX_FLOAT {units=NX_ANGLE}

The polar_angle (two theta) where the detector is placed.

azimuthal_angle: (required) NX_FLOAT {units=NX_ANGLE}

The azimuthal angle where the detector is placed.

data[number of x pixels, number of y pixels, nTOF]: (required) NX_INT

@signal: (required) NX_POSINT

Obligatory value: 1

x_pixel_size: (required) NX_FLOAT {units=NX_LENGTH}

y_pixel_size: (required) NX_FLOAT {units=NX_LENGTH}

distance: (required) NX_FLOAT {units=NX_LENGTH}

time_of_flight[nTOF]: (required) NX_FLOAT {units=NX_TIME_OF_FLIGHT}

sample: (required) NXsample

name: (required) NX_CHAR

Descriptive name of sample

orientation_matrix[3, 3]: (required) NX_FLOAT

The orientation matrix according to Busing and Levy conventions. This is not strictly necessary as the UB can always be derived from the data. But let us bow to common usage which includes thie UB nearly always.

unit_cell[6]: (required) NX_FLOAT

The unit cell, a, b, c, alpha, beta, gamma. Again, not strictly necessary, but normally written.

control: (required) NXmonitor

mode: (required) NX_CHAR

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


Any of these values: monitor | timer

preset: (required) NX_FLOAT

preset value for time or monitor

data[nTOF]: (required) NX_INT

use these attributes primary=1 signal=1

time_of_flight[nTOF]: (required) NX_FLOAT {units=NX_TIME_OF_FLIGHT}

name: (required) NXdata

data –> /NXentry/NXinstrument/NXdetector/data

time_of_flight –> /NXentry/NXinstrument/NXdetector/time_of_flight

NXDL Source: