Diamond Light Source (DLS) I20-Scanning is a high flux X-ray Absorption Spectroscopy (XAS) beamline optimized for challenging samples, operating between 4keV and 20keV. The principal detector used for collecting XAS in fluorescence mode is a Canberra 64-pixel Monolithic Segmented Hyper Pure Germanium Detector (HPGe) historically partnered with the STFC Xspress2 Digital Pulse Processor (DPP). Prior signal analysis had shown that key parameters such as Energy Resolution and Peak-to-Background ratio are compromised by pixel-to-pixel crosstalk within the detector, especially at higher count rates (>250kcps per pixel). The DLS Detector Group have developed the new Xspress4 DPP to address such issues. This results in typically a factor 3-7 increase in detector system count rate for the same Energy Resolution and Peak-to-Background ratio compared to the previous state-of-the-art DPP. An overview of the complete detector system is given and recent results obtained during the commissioning on the beamline are shown. Further, comparative results from challenging experiments are also shown, demonstrating the improved performance attainable at the previous high count rate by partnering legacy HPGe Detectors with the latest DPP technology.
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15 January 2019
PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION – SRI2018
11–15 June 2018
Taipei, Taiwan
Research Article|
January 15 2019
First results using the new DLS Xspress4 digital pulse processor with monolithic segmented HPGe detectors on XAS beamlines
G. Dennis;
G. Dennis
a)
1
Diamond Light Source, Harwell Science and Innovation Campus
, Didcot, Oxfordshire, OX11 0DE, UK
a)Corresponding author: graham.dennis@diamond.ac.uk
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W. Helsby;
W. Helsby
b)
2
Science & Technology Facilities Council, Daresbury Laboratory
, Warrington, Cheshire, WA4 4AD, UK
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D. Omar;
D. Omar
c)
1
Diamond Light Source, Harwell Science and Innovation Campus
, Didcot, Oxfordshire, OX11 0DE, UK
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I. Horswell;
I. Horswell
d)
1
Diamond Light Source, Harwell Science and Innovation Campus
, Didcot, Oxfordshire, OX11 0DE, UK
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N. Tartoni;
N. Tartoni
e)
1
Diamond Light Source, Harwell Science and Innovation Campus
, Didcot, Oxfordshire, OX11 0DE, UK
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S. Hayama;
S. Hayama
f)
1
Diamond Light Source, Harwell Science and Innovation Campus
, Didcot, Oxfordshire, OX11 0DE, UK
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I. Mikulska;
I. Mikulska
g)
1
Diamond Light Source, Harwell Science and Innovation Campus
, Didcot, Oxfordshire, OX11 0DE, UK
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S. Diaz-Moreno
S. Diaz-Moreno
h)
1
Diamond Light Source, Harwell Science and Innovation Campus
, Didcot, Oxfordshire, OX11 0DE, UK
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AIP Conf. Proc. 2054, 060065 (2019)
Citation
G. Dennis, W. Helsby, D. Omar, I. Horswell, N. Tartoni, S. Hayama, I. Mikulska, S. Diaz-Moreno; First results using the new DLS Xspress4 digital pulse processor with monolithic segmented HPGe detectors on XAS beamlines. AIP Conf. Proc. 15 January 2019; 2054 (1): 060065. https://doi.org/10.1063/1.5084696
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