A cryogenically stabilized meV-monochromator for hard X-rays.
The design and performance results for a cryogenically stabilized high-resolution monochromator for 23.880 keV (lambda = 52 pm) X-rays are presented. The four-crystal-reflection monochromator is suitable for nuclear resonant scattering measurements from 119Sn compounds using synchrotron radiation. The design includes a low-vibration cryostat that maintains two of the four crystal reflections at a temperature where the coefficient for thermal expansion of the crystalline material (silicon) vanishes. Test results demonstrate a 1.3 meV bandwidth with negligible broadening due to vibrations and a spectral efficiency of 37% when used with an undulator source.
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA. toellner@anl.gov
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Toellner
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Alatas
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Said
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Shu
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Sturhahn
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Zhao