Data was collected using the Bruker X8 APEX2 CCD diffractometer. KOWARI is a neutron residual stress diffractometer. WOMBAT is a high-intensity neutron powder diffractometer. There are 2 approaches to chamber and diffractometer design that are in use. XSW measurements of single crystal surfaces are performed on a diffractometer. An instrument dedicated to performing such powder measurements is called a powder diffractometer. A diffractometer produces waves at a known frequency, which is determined by their source.