application definition, extends NXobject, version 1.0b


This is a definition for data to be archived by ICAT (http://www.icatproject.org/).


No symbol table
Groups cited:
NXentry, NXinstrument, NXsample, NXsource, NXuser


entry: (required) NXentry

@index: (required) NX_CHAR

title: (required) NX_CHAR

experiment_identifier: (required) NX_CHAR

unique identifier for the experiment

experiment_description: (required) NX_CHAR

Brief description of the experiment and its objectives

collection_identifier: (required) NX_CHAR

ID of user or DAQ define group of data files

collection_description: (required) NX_CHAR

Brief summary of the collection, including grouping criteria

entry_identifier: (required) NX_CHAR

unique identifier for this measurement as provided by the facility

start_time: (required) NX_DATE_TIME

end_time: (required) NX_DATE_TIME

duration: (required) NX_FLOAT {units=NX_TIME}

TODO: needs documentation

collection_time: (required) NX_FLOAT {units=NX_TIME}

TODO: needs documentation

run_cycle: (required) NX_CHAR

TODO: needs documentation

revision: (required) NX_CHAR

revision ID of this file, may be after recalibration, reprocessing etc.

definition: (required) NX_CHAR

Official NeXus NXDL schema to which this file conforms

Obligatory value: NXarchive

program: (required) NX_CHAR

The program and version used for generating this file

@version: (required) NX_CHAR

release_date: (required) NX_CHAR {units=NX_TIME}

when this file is to be released into PD

user: (required) NXuser

name: (required) NX_CHAR

role: (required) NX_CHAR

role of the user

facility_user_id: (required) NX_CHAR

ID of the user in the facility burocracy database

instrument: (required) NXinstrument

name: (required) NX_CHAR

description: (required) NX_CHAR

Brief description of the instrument

(source): (required) NXsource

type: (required) NX_CHAR

Any of these values:

  • Spallation Neutron Source
  • Pulsed Reactor Neutron Source
  • Reactor Neutron Source
  • Synchrotron X-Ray Source
  • Pulsed Muon Source
  • Rotating Anode X-Ray
  • Fixed Tube X-Ray

name: (required) NX_CHAR

probe: (required) NX_CHAR

Any of these values: neutron | x-ray | electron

sample: (required) NXsample

name: (required) NX_CHAR

Descriptive name of sample

sample_id: (required) NX_CHAR

Unique database id of the sample

description: (required) NX_CHAR

type: (required) NX_CHAR

Any of these values:

  • sample
  • sample+can
  • calibration sample
  • normalisation sample
  • simulated data
  • none
  • sample_environment

chemical_formula: (required) NX_CHAR

Chemical formula formatted according to CIF conventions

preparation_date: (required) NX_CHAR {units=NX_TIME}

situation: (required) NX_CHAR

Description of the environment the sample is in: air, vacuum, oxidizing atmosphere, dehydrated, etc.

temperature: (required) NX_FLOAT {units=NX_TEMPERATURE}

magnetic_field: (required) NX_FLOAT {units=NX_CURRENT}

electric_field: (required) NX_FLOAT {units=NX_VOLTAGE}

stress_field: (required) NX_FLOAT {units=NX_UNITLESS}

pressure: (required) NX_FLOAT {units=NX_PRESSURE}

NXDL Source: