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XRD1 Beamline Description

Monochromator

A Si(111) double-crystal fixed-exit monochromator, in the parallel nondispersive mode, is used to select a specific energy in the range of between 4 and 21 keV, with a resolution of 2 eV. Due to the improvements in the ring (top-up mode), an upgrade of the direct water cooling was necessary in order to reduce the thermal expansion, and, since 2015, the two crystals are cryogenically cooled by means of a LN2 closed loop system (Bruker). Parallelism of the surfaces of the two crystals is guarateed by a piezo stage acting on the second crystal: a rapid feedback loop using downstream 4-quadrant ionization chamber mantains the flux intensity at the maximum. The monochromator is routinely calibrated evaluating the absorption edge from fluorescence signal of reference materials (usually Se edge) and the diffraction from NIST standards (usually LaB6).


Last Updated on Friday, 08 January 2016 16:56