26 November 2014
I20-1 is now I20-scanning
I20-2 is now I20-EDE
Please reference the beamline and the branchlines with these new names in your publications.
The new Digital Pulse Processor, Xspress4, developed at Diamond Light Source  employs a novel event cross-talk correction algorithm to allow a significant increase in detector count rate of the 64-element Ge detector for the equivalent MCA spectral performance of Xspress2. The improved resolution attained with Xspress4 allows more dilute and complex samples to be measured in fluorescence mode as we can operate the 64-element fluorescence detector to the Output Count Rate (OCR) of 600 to 800 KHz per element, instead of apporx. 250 kHz with Xspress2.
X-ray Absorption spectrum collected from 43ppm yttrium standard sample (GSD11) using the Xspress4 system on Beamline I20: merger of 4 consecutive XAS spectra together taken with Xspress4 and Xspress 2; MCA spectra taken with Xspress4, showing that the fluorescence line of interest Y Ka is well resolved with Xspress4, thanks to the improved MCA resolution at approx. 630 kHz OCR per element.
Above shows a) a merge of 10 spectra XAS spectra and b) extracted EXFS signal taken using the 64-element Ge detector with the Xspress4 pulse processor system. The spectra were collected from a contaminated sediment containing 80ppm Hg in the in-house LN2 cryostat with the sample-detector distance adjusted to give the OCR of apporx. 600 kHz (Sam Shaw et al., University of Manchester).
 G. Dennis, W. Helsby, D. Omar, I .Horswell, N .Tartoni, S. Hayama, I. Mikulska, and S .Diaz-Moreno. SRI2018 proceedings.
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