A sizeable proportion of the samples and experiments brought to the beamline benefit from a microfocus capacity, which has been designed, constructed and commissioned as an optional ‘drop-in’ end station. This optional configuration for I22 provides additional demagnification and focusing of the primary beam to a spot size of approximately 10 μm2. The microfocus end station consists of secondary focusing optics, an independent sample stage and positioning motors, an inline microscope camera, a beamstop, and a detector, all of which are detailed here. The entire end station is self- contained on two free-standing steel frames, one for the optics and sample position and one for the detector platform. The energy range available is currently 14-20 keV, as the sample positioning area and flight path are in air. We have recorded a flux of 5.645 x 1010 photons/sec in the focused beam at 14 keV.
This option is available to users but has to be scheduled in blocks of microfocus time to minimise disruption in operations.
The latest publication from the microfocus platform on I22 concerns developing a model of stiffness modulation for a remarkable biological material found in echinoderms (e.g., sea cucumbers and starfish) which has the unique attribute, among collagenous tissues, of being able to rapidly change its stiffness and extensibility under neural control.
Interfibrillar stiffening of echinoderm mutable collagenous tissue demonstrated at the nanoscale
J. Mo, S. F. Prévost, L. M. Blowes, M. Egertová, N. J. Terrill, W. Wang, M. R. Elphick and H. S. Gupta, Proceedings of the National Academy of Sciences, 2016, 113, E6362-E63712016.
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