Figure 2
Monochromator construction showing the principle of bending and cooling. The crystal is clamped at one end and bent to cylindrical shape by a moment acting on the free end via a leaf spring. The incident beam is reflected and partly transmitted by the thin centre part of the crystal. The cross section of the crystal (hatched) and the cooling frame are shown in the lower figure. Cooling is achieved by pockets of InGa, which are in direct contact with the crystal and the water-cooled copper frame. |