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Measurement & Minimization of Mount Induced Strain on Double Crystal Monochromator Crystals

DOI: 10.1088/1742-6596/425/5/052024 DOI Help

Authors: J. Kelly (Diamond Light Source) , S. G. Alcock (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Conference Series , VOL 425 (5)

State: Published (Approved)
Published: March 2013

Abstract: Opto-mechanical mounts can cause significant distortions to monochromator crystals and mirrors if not designed or implemented carefully. A slope measuring profiler, the Diamond-NOM [1], was used to measure the change in tangential slope as a function of crystal clamping configuration and load. A three point mount was found to exhibit the lowest surface distortion (< 2╬╝rad peak-to-valley) over the whole length of the monochromator 2nd crystal. A thermal circuit, comprising the liquid nitrogen manifold to the crystal, was modelled using experimental data for the 2nd crystal absorbed beam power and braid link thermal conductance. In the case of the I09 monochromator 2nd crystal assembly, the temperature drop across the 3 indium mount pads was calculated to be 25% of the total 0.22 K. Less than 1% loss of flux due to the 2nd crystal strain is expected at 25keV. This three pad mount will be used in the monochromators on the I09 and I23 beamlines at Diamond Light Source

Journal Keywords: Beams; Crystals; Indium; Light Sources; Liquids; Minimization; Monochromators; Nitrogen; Peaks; Strains; Surfaces

Subject Areas: Physics

Instruments: I09-Surface and Interface Structural Analysis , I23-Long wavelength MX