| Issue |
J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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|---|---|---|
| Page(s) | C2-297 - C2-301 | |
| DOI | https://doi.org/10.1051/jp4/1997205 | |
J. Phys. IV France 7 (1997) C2-297-C2-301
DOI: 10.1051/jp4/1997205
Micro-XAS Using Tapered Capillary Concentrating Optics
S.M. Heald1, D.L. Brewe2, B. Barg2, K.H. Kim2, F.C. Brown3 and E. A. Stern21 APS Bldg. 435E, Argonne National Laboratory, 9700 S. Cass Ave., Argonne IL 60439, U.S.A.,
2 Physics Dept., University of Washington, Seattle WA 98195, U.S.A.
3 Physics Dept., University of Washington, Seattle WA 98195 U.S.A.
Abstract
Tapered capillary optics are a promising choice for producing micro-beams at third generation sources. The
reproducible energy dependence of their X-ray transmission, and fixed output beam position make them well suited for
micro-XAS applications. Fiber optics techniques have been developed to produce long (1 m) capillaries which provide a
good match to the low divergence undulator beams at third generation sources. The results of X-ray tests made at the NSLS
indicate the performance of many of the capillaries closely match theoretical values. Currently these provide a monochromatic
beam of about 106 ph/sec/μm² at an unfocused bending magnet beamline. High quality X-ray images and micro-XAFS
have been obtained at the NSLS with better than 3 μm resolution. The same capillaries should provide more than 1010
ph/sec/μm² at an APS undulator, indicating that sub-μm XAS is possible.
© EDP Sciences 1997