Large Scale Facilities

Monochromator Angle Detection

highly accurate interferometric measurement for angle control in DCMs

Monochromators play a key role in hard X-ray applications of synchrotrons worldwide.
The function of a monochromator is to select and transmit X-ray radiation of the desired photon energy from an incident white synchrotron radiation beam. Using double-crystal monochromators (DCMs) allows it to produce a monochromatic exit beam. The specific energy is selected by rotations of the crystals and thereby varying the Bragg angle.

For the best X-ray exit beam quality the position, angular adjustment, and stability needs to be nanometer precise. This can only be ensured by monitoring the movements with a suitable sensor, allowing active compensation for misalignments. As the monochromators are operated in ultra-high vacuum (UHV), radiation harsh environments, as well as high and low temperatures, the metrology equipment must provide ultimate precision even in these challenging conditions. 

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