PINHOLES AND SLITS

At both ends of the lens stack should be installed a pinhole (2D-lenses) or a slit (1D-lenses) which limits the incoming beam in its lateral extension. The pinholes and the slits should be a little smaller than the geometric aperture of the lenses. This reduces scattered radiation from those parts of the lens which are outside on the paraboloids.

Pinholes

All pinholes for 2D-lenses have 12 mm outer diameter and 1 or 1.2 mm thickness. They are available with a central hole diameter of 0.3, 0.4, 0.6, 0.8, 1.0, 1.3, 1.9, 2.4, and 3.0 mm. This is a little bit smaller than the geometric aperture of the 2D-lenses. The material is a Cu-Al-Ni alloy.

Pinholes for x-ray lenses
Fig. 1. Set of pinholes

Slits

The slits for 1D-lenses have 20×20 mm2 shape with slits of 1.5 and 2.0 mm length and a width of 0.6, 0.8, 1.0, 1.3, 1.8, and 2.2 mm. The material is a Cu-Al-Ni alloy.

Slits for x-ray lenses
Fig. 2. Set of slits

Please read the user instructions of our optical components!