The original optical scheme of ID24 consists of a pair of mirrors (VFM and HFM) in a Kirkpatrick Baez configuration, and of a polychromator in Bragg or Laue geometry. The role of the HFM is to transform the highly collimated undulator beam into a diverging beam in the horizontal plane, to provide a large footprint on the crystal and therefore a large energy range in the polychromatic fan to enable EXAFS. A position sensitive detector placed at the end of the 2Θ spectrometer arm converts energy (X-ray direction) into position (detector pixel).

The upgraded version of ID24 features two branches, as illustrated in the figure below. The double branch scheme increases efficiency in the use of beamtime as it allows complex experiments to be assembled, interfaced and tested on one branch while experiments are running on the other.

updated version of ID24.JPG

Upgraded version of ID24: the new design features 2 branches