Development of highly stable Bragg polychromator for energy dispersive XAFS

16th International Conference on X-ray Absorption Fine Structure

Kato, Kazuo^1 ; Irie, Takaki^1 ; Uruga, Tomoya^1,2 ; Uera, Kei^1 ; Kawase, Morihiro^1

Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, Japan^1

University of Electro-Communications, Innovation Research Center for Fuel Cells, Chofu, Tokyo, Japan^2

关键词: Bending-magnet beamline;    Copper grains;    Energy dispersive;    Highly stables;    Performance tests;    Polychromators;    Thermal contact;    Water cooling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012025/pdf
DOI  :  10.1088/1742-6596/712/1/012025

来源: IOP

【 摘 要 】

A highly stable Bragg polychromator for energy dispersive XAFS (DXAFS) systems was developed at the bending magnet beamline BL28B2 at SPring-8. The bending device is a four-point-type bender. Additional stoppers for the crystal are attached at both ends of the bender to maintain the position and curvature of the crystal in the bender. The crystal was indirectly cooled in a copper grain bath with good thermal contact, the temperature of which was precisely controlled using water cooling. A performance test of stability of the new Bragg polychromator showed that the energy drift in the DXAFS spectra was reduced to less than 0.01 eV for 2 hrs.