application definition, extends NXobject


This is a application definition for raw data from a TOF neutron powder diffractometer


The symbol(s) listed here will be used below to coordinate datasets with the same shape.

nDet: Number of detectors

nTimeChan: nTimeChan description

Groups cited:

NXdata, NXdetector, NXentry, NXinstrument, NXmonitor, NXsample, NXuser


entry: (required) NXentry

title: (required) NX_CHAR

start_time: (required) NX_DATE_TIME

definition: (required) NX_CHAR

Official NeXus NXDL schema to which this file conforms

Obligatory value: NXtofnpd

pre_sample_flightpath: (required) NX_FLOAT {units=NX_LENGTH}

This is the flight path before the sample position. This can be determined by a chopper, by the moderator or the source itself. In other words: it the distance to the component which gives the T0 signal to the detector electronics. If another component in the NXinstrument hierarchy provides this information, this should be a link.

user: (required) NXuser

name: (required) NX_CHAR

INSTRUMENT: (required) NXinstrument

detector: (required) NXdetector

data: (required) NX_INT (Rank: 2, Dimensions: [nDet, nTimeChan])

detector_number: (required) NX_INT (Rank: 1, Dimensions: [nDet])

distance: (required) NX_FLOAT (Rank: 1, Dimensions: [nDet]) {units=NX_LENGTH}

distance to sample for each detector

time_of_flight: (required) NX_FLOAT (Rank: 1, Dimensions: [nTimeChan]) {units=NX_TIME_OF_FLIGHT}

polar_angle: (required) NX_FLOAT (Rank: 1, Dimensions: [nDet]) {units=NX_ANGLE}

polar angle for each detector element

azimuthal_angle: (required) NX_FLOAT (Rank: 1, Dimensions: [nDet]) {units=NX_ANGLE}

azimuthal angle for each detector element

SAMPLE: (required) NXsample

name: (required) NX_CHAR

Descriptive name of sample

MONITOR: (required) NXmonitor

mode: (required) 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: (required) NX_FLOAT

preset value for time or monitor

distance: (required) NX_FLOAT {units=NX_LENGTH}

data: (required) NX_INT (Rank: 1, Dimensions: [nTimeChan])

time_of_flight: (required) NX_FLOAT (Rank: 1, Dimensions: [nTimeChan]) {units=NX_TIME_OF_FLIGHT}

data: (required) NXdata

data: link (suggested target: /NXentry/NXinstrument/NXdetector/data)

detector_number: link (suggested target: /NXentry/NXinstrument/NXdetector/detector_number)

time_of_flight: link (suggested target: /NXentry/NXinstrument/NXdetector/time_of_flight)

Hypertext Anchors

List of hypertext anchors for all groups, fields, attributes, and links defined in this class.

NXDL Source: