.. auto-generated by script ../../../../utils/nxdl2rst.py from the NXDL source NXxeuler.nxdl.xml

.. index::
    ! NXxeuler (application definition)
    ! xeuler (application definition)
    see: xeuler (application definition); NXxeuler

.. _NXxeuler:

========
NXxeuler
========

**Status**:

  application definition, extends :ref:`NXxbase`

**Description**:

  raw data from a :index:`four-circle diffractometer` with an :index:`eulerian cradle`, extends :ref:`NXxbase`

  It extends :ref:`NXxbase`, so the full definition is the content 
  of :ref:`NXxbase` plus the data defined here. All four angles are 
  logged in order to support arbitrary scans in reciprocal space.

**Symbols**:

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

  **nP**: Number of points

**Groups cited**:
  :ref:`NXdata`, :ref:`NXdetector`, :ref:`NXentry`, :ref:`NXinstrument`, :ref:`NXsample`

.. index:: NXentry (base class); used in application definition, NXinstrument (base class); used in application definition, NXdetector (base class); used in application definition, NXsample (base class); used in application definition, NXdata (base class); used in application definition

**Structure**:

  .. _/NXxeuler/entry-group:

  **entry**: (required) :ref:`NXentry`


    .. _/NXxeuler/entry/definition-field:

    .. index:: definition (field)

    **definition**: (required) :ref:`NX_CHAR <NX_CHAR>`

      Official NeXus NXDL schema to which this file conforms

      Obligatory value: ``NXxeuler``

    .. _/NXxeuler/entry/instrument-group:

    **instrument**: (required) :ref:`NXinstrument`


      .. _/NXxeuler/entry/instrument/detector-group:

      **detector**: (required) :ref:`NXdetector`


        .. _/NXxeuler/entry/instrument/detector/polar_angle-field:

        .. index:: polar_angle (field)

        **polar_angle**: (required) :ref:`NX_FLOAT <NX_FLOAT>` (Rank: 1, Dimensions: [nP]) {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

          The polar_angle (two theta) where the detector is placed
          at each scan point.

    .. _/NXxeuler/entry/sample-group:

    **sample**: (required) :ref:`NXsample`


      .. _/NXxeuler/entry/sample/rotation_angle-field:

      .. index:: rotation_angle (field)

      **rotation_angle**: (required) :ref:`NX_FLOAT <NX_FLOAT>` (Rank: 1, Dimensions: [nP]) {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

        This is an array holding the sample rotation angle at each
        scan point

      .. _/NXxeuler/entry/sample/chi-field:

      .. index:: chi (field)

      **chi**: (required) :ref:`NX_FLOAT <NX_FLOAT>` (Rank: 1, Dimensions: [nP]) {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

        This is an array holding the chi angle of the eulerian
        cradle at each scan point

      .. _/NXxeuler/entry/sample/phi-field:

      .. index:: phi (field)

      **phi**: (required) :ref:`NX_FLOAT <NX_FLOAT>` (Rank: 1, Dimensions: [nP]) {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

        This is an array holding the phi rotation of the eulerian
        cradle at each scan point

    .. _/NXxeuler/entry/name-group:

    **name**: (required) :ref:`NXdata`


      .. _/NXxeuler/entry/name/polar_angle-link:

      **polar_angle**: :ref:`link<Design-Links>` (suggested target: ``/NXentry/NXinstrument/NXdetector/polar_angle``


      .. _/NXxeuler/entry/name/rotation_angle-link:

      **rotation_angle**: :ref:`link<Design-Links>` (suggested target: ``/NXentry/NXsample/rotation_angle``


      .. _/NXxeuler/entry/name/chi-link:

      **chi**: :ref:`link<Design-Links>` (suggested target: ``/NXentry/NXsample/chi``


      .. _/NXxeuler/entry/name/phi-link:

      **phi**: :ref:`link<Design-Links>` (suggested target: ``/NXentry/NXsample/phi``



Hypertext Anchors
-----------------

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


* :ref:`/NXxeuler/entry-group </NXxeuler/entry-group>`
* :ref:`/NXxeuler/entry/definition-field </NXxeuler/entry/definition-field>`
* :ref:`/NXxeuler/entry/instrument-group </NXxeuler/entry/instrument-group>`
* :ref:`/NXxeuler/entry/instrument/detector-group </NXxeuler/entry/instrument/detector-group>`
* :ref:`/NXxeuler/entry/instrument/detector/polar_angle-field </NXxeuler/entry/instrument/detector/polar_angle-field>`
* :ref:`/NXxeuler/entry/name-group </NXxeuler/entry/name-group>`
* :ref:`/NXxeuler/entry/name/chi-link </NXxeuler/entry/name/chi-link>`
* :ref:`/NXxeuler/entry/name/phi-link </NXxeuler/entry/name/phi-link>`
* :ref:`/NXxeuler/entry/name/polar_angle-link </NXxeuler/entry/name/polar_angle-link>`
* :ref:`/NXxeuler/entry/name/rotation_angle-link </NXxeuler/entry/name/rotation_angle-link>`
* :ref:`/NXxeuler/entry/sample-group </NXxeuler/entry/sample-group>`
* :ref:`/NXxeuler/entry/sample/chi-field </NXxeuler/entry/sample/chi-field>`
* :ref:`/NXxeuler/entry/sample/phi-field </NXxeuler/entry/sample/phi-field>`
* :ref:`/NXxeuler/entry/sample/rotation_angle-field </NXxeuler/entry/sample/rotation_angle-field>`

**NXDL Source**:
  https://github.com/nexusformat/definitions/blob/main/applications/NXxeuler.nxdl.xml