Author: Pocock, B.A.
Paper Title Page
Development of a Pair of Medium Energy X-Ray Absorption Spectroscopy Beamlines at Australian Synchrotron  
  • B.A. Pocock
    AS - ANSTO, Clayton, Australia
  • C. Glover, B. Mountford
    ASCo, Clayton, Victoria, Australia
  The Medium Energy X-ray absorption spectroscopy (MEX) beamlines are designed to perform routine, high throughput XAS experiments in the energy range 1.7 to 13.6 keV; split over two beamlines. This energy range is often overlooked but allows access to useful absorption K-edges of Si, P, S, Cl and Ca. Individual components of this system are relatively common, however the large number of components and broad functionality makes for a difficult integration challenge. Both beamlines are supplied by a single bending magnet, with the MEX2 beam being separated away by a pair of side bounce, cylindrically bent mirrors. MEX1 utilises a pair of multi stripe mirrors (Si, B4C and Rh) to access the desired energy range. Energy selection is performed by Double Crystal Monochromators (DCM), which are designed for both step and slew scanning. The end stations of both beamlines have Silicon Drift Detectors (SDD) and multiple ion chambers to facilitate fluorescence and transmission measurements. Sample temperatures can be controlled with any of the three helium recirculating cryostats or heaters. High Energy Resolution Fluorescence Detection (HERFD) experiments can be performed using either the single crystal spectrometer (MEX2) or the five crystal spectrometer (MEX1). MEX1 also includes a microprobe which uses a Kirkpatrick-Baez (KB) mirror to focus to a several micron spot. Given the energy range, attenuation of the photons is a particular challenge. These end stations are designed to minimise beam attenuation and maximise experiment versatility by selectively allowing high vacuum or helium environments in different regions. Removable windows and custom designed interfaces between components minimises the number of windows in the beam path which would have further attenuated photons.  
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