The purpose of the beryllium-windows is to seal off the vacuum areas of the beamline from the non-vacuum areas. Beryllium (Be) is a material that is very transparent to x-rays, and it is therefore well suited to this task as the beam is affected only in a very small way by passing through.


There are 2 Be-windows installed in or connected to BM5. The first one separates the vacuum of the storage ring from the beamline and cannot be reached from BM5. This way, if an accident should compromise the vacuum inside BM5, the vacuum of the storage ring is unaffected. The other one is placed after the Secondary Slits in Experimental Hutch 1.



Thickness: 0.5mm (all windows)


Beam transmission plot: