Neutron Guide Alignment

3D measuring machine CMM

The alignment of the neutron guides is based on our coordinate measuring machine (CMM). Each guide unit is measured on the CMM with high accuracy.

CMM coordinate measuring machine

We measure the front and back face of the guide units with respect to an additional measuring feature.


We add one of the three following features to the guides: 1.) Extensions 2.) A conical bore 3.) Fiducials

Alignment feature in the glass

The conical bore: For the measuring on the CMM we put a steel sphere in the bore and measure the position and the cross sections.

Sphere for measuring

The conical bore: For the alignment on site we put a fiducal in the bore.

alignment plate for the extensions

The Extensions: The alignment plates are made of glass. They have a bore, a groove and a plane.

Extensions from a Chopper guide

The Extensions, the best solution. It consists of two parts: alignment plate and extension. The plates are glued onto the units and the extension stands on top of the plates.

Extensions on a chopper guide

The extensions have three ceramic spheres, which fits perfectly to the alignment plates. The repeatable accuracy is 5 microns.

Extensions at work

On site, the extensions allow for very quick and precise alignment.