X-Ray Beam Modes and Properties
The Insertion Device (ID) for the DCS is a Revolver Undulator that can be switched between two sets of magnets with periods of 27 mm or 17.2 mm (U27 and U17.2) to provide spectral tuning in energy from 7 to 40 keV, with a gap between 16-20 keV.
The beamline optics are designed to deliver four x-ray beam modes that can be fine-tuned in energy, beam-size, bandwidth, and flux to deliver the appropriately conditioned beam for a particular experiment. For example, broad-band white beam is particularly useful for high-energy Phase Contrast Imaging (PCI) while narrow-bandwidth monochromatic beam (~0.01% Bandwidth (BW)) may be used for precision diffraction measurements. Focused pink beam (1-5% BW) is most useful for obtaining a series of high-flux, single-pulse snapshots where only a single ~100 ps x-ray burst is recorded per frame on an area detector.
Complete set of x-ray diagnostics in each station for precise alignment, focus, and characterization of x-rays
for each experimental setup
- Laser aligned to x-rays provides visible beam path for initial alignment
- GigE camera coupled to YAG crystal with microscope objective for precisely focusing and shaping x-ray beam
- Spectral flux characterization using Si(220) monochromator on precision rotation stage