Beamline 10.3.2 at ALS: a hard X-ray microprobe for environmental and materials sciences
Journal of Synchrotron Radiation
Volume 11, Issue 3, pages 239–247, May 2004
How to Cite
Marcus, M. A., MacDowell, A. A., Celestre, R., Manceau, A., Miller, T., Padmore, H. A. and Sublett, R. E. (2004), Beamline 10.3.2 at ALS: a hard X-ray microprobe for environmental and materials sciences. Journal of Synchrotron Radiation, 11: 239–247. doi: 10.1107/S0909049504005837
- X-ray instrumentation;
- powder diffraction;
Beamline 10.3.2 at the ALS is a bend-magnet line designed mostly for work on environmental problems involving heavy-metal speciation and location. It offers a unique combination of X-ray fluorescence mapping, X-ray microspectroscopy and micro-X-ray diffraction. The optics allow the user to trade spot size for flux in a size range of 5–17 µm in an energy range of 3–17 keV. The focusing uses a Kirkpatrick–Baez mirror pair to image a variable-size virtual source onto the sample. Thus, the user can reduce the effective size of the source, thereby reducing the spot size on the sample, at the cost of flux. This decoupling from the actual source also allows for some independence from source motion. The X-ray fluorescence mapping is performed with a continuously scanning stage which avoids the time overhead incurred by step-and-repeat mapping schemes. The special features of this beamline are described, and some scientific results shown.