Open AccessPosition and flux stabilization of X‐ray beams produced by double‐crystal monochromators for EXAFS scans at the titanium K ‐edge
Author(s) -
van Silfhout Roelof,
Kachatkou Anton,
Groppo Elena,
Lamberti Carlo,
Bras Wim
Publication year - 2014
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577513034747
Subject(s) - monochromator , beamline , beam (structure) , synchrotron , optics , monochromatic color , flux (metallurgy) , extended x ray absorption fine structure , position (finance) , synchrotron radiation , crystal (programming language) , storage ring , materials science , physics , absorption spectroscopy , computer science , wavelength , finance , economics , metallurgy , programming language
The simultaneous and active feedback stabilization of X‐ray beam position and monochromatic beam flux during EXAFS scans at the titanium K ‐edge as produced by a double‐crystal monochromator beamline is reported. The feedback is generated using two independent feedback loops using separate beam flux and position measurements. The flux is stabilized using a fast extremum‐searching algorithm that is insensitive to changes in the synchrotron ring current and energy‐dependent monochromator output. Corrections of beam height are made using an innovative transmissive beam position monitor instrument. The efficacy of the feedback stabilization method is demonstrated by comparing the measurements of EXAFS spectra on inhomogeneous diluted Ti‐containing samples with and without feedback applied.