3.3.2.22. NXmonopd

Status:

application definition, extends NXobject

Description:

Monochromatic Neutron and X-Ray Powder diffractometer …

Monochromatic Neutron and X-Ray Powder diffractometer

Instrument definition for a powder diffractometer at a monochromatic neutron or X-ray beam. This is both suited for a powder diffractometer with a single detector or a powder diffractometer with a position sensitive detector.

Symbols:

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

i: i is the number of wavelengths

nDet: Number of detectors

Groups cited:

NXcrystal, NXdata, NXdetector, NXentry, NXinstrument, NXmonitor, NXsample, NXsource

Structure:

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 …

Official NeXus NXDL schema to which this file conforms

Obligatory value: NXmonopd

INSTRUMENT: (required) NXinstrument ⤆

SOURCE: (required) NXsource ⤆

type: (required) NX_CHAR ⤆

name: (required) NX_CHAR ⤆

probe: (required) NX_CHAR ⤆

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

CRYSTAL: (required) NXcrystal ⤆

wavelength: (required) NX_FLOAT (Rank: 1, Dimensions: [i]) {units=NX_WAVELENGTH} ⤆

Optimum diffracted wavelength

DETECTOR: (required) NXdetector ⤆

polar_angle: (required) NX_FLOAT (Rank: 1, Dimensions: [nDet]) ⤆

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

detector signal (usually counts) are already …

detector signal (usually counts) are already corrected for detector efficiency

SAMPLE: (required) NXsample ⤆

name: (required) NX_CHAR ⤆

Descriptive name of sample

rotation_angle: (required) NX_FLOAT {units=NX_ANGLE} ⤆

Optional rotation angle for the case when the powder diagram …

Optional rotation angle for the case when the powder diagram has been obtained through an omega-2theta scan like from a traditional single detector powder diffractometer

MONITOR: (required) NXmonitor ⤆

mode: (required) NX_CHAR ⤆

Count to a preset value based on either clock time (timer) …

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

integral: (required) NX_FLOAT {units=NX_ANY}

Total integral monitor counts

DATA: (required) NXdata ⤆

polar_angle: (required) NX_CHAR

Link to polar angle in /NXentry/NXinstrument/NXdetector

data: (required) NX_CHAR

Link to data in /NXentry/NXinstrument/NXdetector

Hypertext Anchors

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

NXDL Source:

https://github.com/nexusformat/definitions/blob/main/applications/NXmonopd.nxdl.xml