.. 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`, version 1.0b

**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**:

  No symbol table

**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**:

  **entry**: :ref:`NXentry`


    .. index:: definition (field)

    **definition**: :ref:`NX_CHAR <NX_CHAR>`

      Official NeXus NXDL schema to which this file conforms

      Obligatory value:  ``NXxeuler``

    **instrument**: :ref:`NXinstrument`


      **detector**: :ref:`NXdetector`


        .. index:: polar angle (field)

        **polar_angle[np]**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

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

    **sample**: :ref:`NXsample`


      .. index:: rotation angle (field)

      **rotation_angle[np]**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

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

      .. index:: chi (field)

      **chi[np]**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

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

      .. index:: phi (field)

      **phi[np]**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

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

    **name**: :ref:`NXdata`


      **polar_angle** --> /NXentry/NXinstrument/NXdetector/polar_angle


      **rotation_angle** --> /NXentry/NXsample/rotation_angle


      **chi** --> /NXentry/NXsample/chi


      **phi** --> /NXentry/NXsample/phi


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