The main role for this end station set up is to carry out mapping and dynamic experiments on heterogeneous samples with regions of interest in few tens of micron size range. Most microfocus experiments carried out on I22 so far have used beamsize between 10-25 micron. Previously these experiments have been carried out at 14keV to ease attenuation due to air scatter. Phase 1 of the BCO Upgrade offers significantly enhanced capability with variable beamsize, energy and evacuated flight tubes to improve data quality.
The new set-up provides demagnification and focusing of the primary beam down to a minimum spot size of approximately 10 μm2. The microfocus sample stages are still available for accurate sample positioning and with the completion of the BCO upgrade in late 2019 a new inline microscipe capability for ALL modes will be available.
The new optical layout has significantly reduced divergence over the old end station which gives access to much lower q than was available previously. While we currently offer energies in the range 14-20 keV, the new set up using the SAXS camera tubes allows us to consider on a case by case basis lower energy microfocus experiments.
We have recorded a flux of 5.6 x 1010 photons/sec in the focused beam at 14 keV, very similar to the old system but with significantly reduced backgrounds, hugely improved q-range and lower divergence.
This option is now available to users throughout the schedule, via the normal PRP route.
The latest publication from the microfocus platform on I22 determined the in situ strains at the macro-, meso-, and molecular-levels in stomatopod cuticle simultaneously.
Molecular to macroscale energy absorption mechanisms in biological body armour illuminated by scanning X-ray diffraction with in situ compression
Zhang, Y., Garrevoet, J., Wang, Y., Roeh, J. T., Terrill, N. J., Falkenberg, G., Dong, Y. & Gupta, H. S. (2020). ACS Nano 14, 16535–16546
Diamond Light Source is the UK's national synchrotron science facility, located at the Harwell Science and Innovation Campus in Oxfordshire.
Copyright © 2020 Diamond Light Source
Diamond Light Source Ltd
Harwell Science & Innovation Campus
Diamond Light Source® and the Diamond logo are registered trademarks of Diamond Light Source Ltd
Registered in England and Wales at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom. Company number: 4375679. VAT number: 287 461 957. Economic Operators Registration and Identification (EORI) number: GB287461957003.