Diffractometer

The main part of the diffractometer is the high resolution spindle. The air bearing axis has a sphere of confusion less than 2 microns allowing a accurate centering of the sample in the X-ray. This axis is also mounted on a three translation table (phix, phiy and phiz) allowing to change the rotation axis position remotely and bring the rotation axis in the X-ray beam. In order to align the sample on the center of rotation, there is an additional 2 axis table (sampx and sampy) equivallent to the two translations on a standard goniometer head.

The diffractometer is also delivered with a remotely controlled light you can bring in and out (lightin and lightout) using pneumatic cylinders and change the intensity of the light by using a pseudo-motor called light. The fluorescence detector is also remotely controlled (fldetin and fldetout).

The phi axis is fitted with a metal rod and magnet to fix metallic pin (Hampton system or equivallent). In this conformation the pin length must be included between 16 mm and 27 mm. It is also possble to remove this standard magnet and put a traditional goniometer head. Then the size of goniometer head (+ cryo-arc) + pin must be between 61 and 72 mm.

The backstop is made of Tungstene carbide with a G ring shape with a thickness of 300 microns. It is mounted on a two translation stage (BeamStop Vert (bstopz) and BeamStop hor (bstopy) respectively vertical and horizontal). The alignement is performed by fitting accurately the metal pin on the backstop support right at the center of the V shape by a strong magnet. The collimator aperture is 300 microns diameter. The alignment of the backstop is performed remotely by moving bstopy and bstopz and also manually if needed with the two rotation screws on the backstop support (see trouble shooting section for more informations).