3.3.2.20. NXtofraw

Status:

application definition, extends NXobject, version 1.0b

Description:

This is an application definition for raw data from a generic TOF instrument

Symbols:

No symbol table

Groups cited:

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

Structure:

entry: NXentry

title: NX_CHAR

start_time: NX_DATE_TIME

definition: NX_CHAR

Official NeXus NXDL schema to which this file conforms

Obligatory value: NXtofraw

duration: NX_FLOAT

run_number: NX_INT

pre_sample_flightpath: 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 is 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: NXuser

name: NX_CHAR

instrument: NXinstrument

detector: NXdetector

data[ndet, ntimechan]: NX_INT

detector_number[ndet]: NX_INT

distance[ndet]: NX_FLOAT {units=NX_LENGTH}

distance to sample for each detector

time_of_flight[ntimechan]: NX_FLOAT {units=NX_TIME_OF_FLIGHT}

polar_angle[ndet]: NX_FLOAT {units=NX_ANGLE}

polar angle for each detector element

azimuthal_angle[ndet]: NX_FLOAT {units=NX_ANGLE}

polar angle for each detector element

(sample): NXsample

name: NX_CHAR

Descriptive name of sample

nature: NX_CHAR

Any of these values: powder | liquid | single crystal

(monitor): 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

distance: NX_FLOAT {units=NX_LENGTH}

data[ntimechan]: NX_INT

time_of_flight[ntimechan]: NX_FLOAT {units=NX_TIME_OF_FLIGHT}

integral_counts: NX_INT {units=NX_UNITLESS}

data: NXdata

data –> /NXentry/NXinstrument/NXdetector/data

detector_number –> /NXentry/NXinstrument/NXdetector/detector_number

time_of_flight –> /NXentry/NXinstrument/NXdetector/time_of_flight

NXDL Source:

https://github.com/nexusformat/definitions/blob/master/applications/NXtofraw.nxdl.xml