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

.. index::
    ! NXxkappa (application definition)
    ! xkappa (application definition)
    see: xkappa (application definition); NXxkappa

.. _NXxkappa:

========
NXxkappa
========

**Status**:

  application definition, extends :ref:`NXxbase`, version 1.0b

**Description**:

  This is the application definition for raw data from a kappa geometry (CAD4) single crystal
  diffractometer. It extends NXxbase, so the full definition is the content of NXxbase plus the
  data defined here.

**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 (data field)

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

      Official NeXus NXDL schema to which this file conforms

      Obligatory value:  ``NXxkappa``

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


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


        .. index:: polar_angle (data field)

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

          The polar_angle (two theta) at each scan point

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


      .. index:: rotation_angle (data 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:: kappa (data field)

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

        This is an array holding the kappa angle at each scan point

      .. index:: phi (data field)

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

        This is an array holding the phi angle at each scan point

      .. index:: alpha (data field)

      **alpha**: :ref:`NX_FLOAT <NX_FLOAT>` {units=\ :ref:`NX_ANGLE <NX_ANGLE>`}

        This holds the inclination angle of the kappa arm.

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


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


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


      **kappa** --> /NXentry/NXsample/kappa


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


**Source**:
  Automatically generated from https://github.com/nexusformat/definitions/blob/master/applications/NXxkappa.nxdl.xml