High-speed and fully spectroscopic X-ray Photon Counting Pixel Detector for XRD and EDXRF

Start Date
11-01-2018 11:00
Auditorium, Central Building
Speaker's name
Einar Nygard
Speaker's institute
Enxense (Norway)
Contact name
Ewa Wyszynska
Host name
Wouter van Beek
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High-speed and fully spectroscopic X-ray Photon Counting Pixel Detector for XRD and EDXRF

Presented by: Einar Nygård1 (einar@enxense.com)

Contributions also by: Malakhov N.1, Taguchi T.2, Nagano T.3, Yamamoto K.3 1Enxense AS, Asker, Norway

2Rigaku Corporation, X-ray Apparatus Division, Tokyo, Japan

3Hamamatsu Photonics K.K., Solid State Division, Hamamatsu City, Japan



In XRD applications today, silicon detectors are frequently used. In some cased these are strip-detectors using relatively long strips resulting in high-capacitance and high dark-current, both limiting factors for the spectral resolution. Or, they might be pixel detectors based on photon-counting electronics which significantly degrades the spectral analysis possibility. For EDXRF applications today, the SDD detector is dominating the market. The spectral performance of the SDD is close to perfection and cannot be improved much more. The detection-rate capability, however, is quite limited. This is because its one single output channel is limiting the total throughput capability, hence causing the rate-capability per mm2 to drop in inverse proportion to the detector surface area. A tiny area detector can consequently be relatively fast whereas a very large area detector will be very much slower when comparing their rate-capability per mm2.


A hybrid pixel detector consisting of a 2D matrix pixel-ASIC in a bump-bonded sandwich with a matched pixel Silicon- sensor has been developed. This detector concept is offering significant improvements to the abovementioned limitations through combining the advantages of small pixels and yet large area sensitivity through the general features of modern-style pixel detectors, often also found in photon-counting style detectors. As opposed to the latter, however, each pixel in our concept is equipped with full spectroscopy functionality which in combination with novel read-out architecture allows for a data-driven, high-speed transfer of full spectral data from each pixel to the computer.

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