Jun 25 – 29, 2023
Ole-Johan Dahls Hus
Europe/Oslo timezone

P2.20: Characterization of a Megapixel JUNGFRAU Detector with Novel GaAs:Cr Sensor for Photon Science Applications

Jun 28, 2023, 4:59 PM
Ole-Johan Spiseri (Ole-Johan Dahls Hus)

Ole-Johan Spiseri

Ole-Johan Dahls Hus

Ole Johan Dahls Hus - Oslo Science Park Gaustadalléen 23B, 0373 Oslo


Kirsty Paton (Paul Scherrer Institut)


As more synchotrons and X-ray free electron lasers move towards using high (> 20 keV) energy X-rays, there is an increased need for efficient, large area, high-speed X-ray detectors for use at these facilities. High-Z sensors, such as GaAs:Cr, are preferable to Si in detectors of high-energy photons, due to their increased stopping power and therefore improved efficiency at higher energies. However, high-Z sensor materials often feature defects that introduce distortions into the images recorded. These defects also have an adverse impact on the material's charge-transport properties and enable unwanted behaviour such as afterglow effects and polarization.

We will present the characterization of a one-megapixel detector based on the JUNGFRAU1.0 ASIC with a sensor made from a new type of GaAs:Cr. The charge-integrating nature of JUNGFRAU makes it ideal for studying the behaviour and properties of new sensor materials. Results will include measurements of the new material’s charge-carrier properties and propensity to display afterglow effects, as well as the device's I-V and I-t characteristics, gain and energy resolution. We will compare the performance of the new material with that of GaAs:Cr sensors from other sources, also bonded to JUNGFRAU, to quantify the degree of improvement offered by the new material.

Primary author

Kirsty Paton (Paul Scherrer Institut)


Rebecca Barten (Paul Scherrer Institut) Filippo Baruffaldi (Paul Scherrer Insitut (Switzerland)) Anna Bergamaschi Martin Brückner (PSI - Paul Scherrer Institut) Maria del Mar Carulla Areste Roberto Dinapoli (Paul Scherrer Institut) Simon Ebner (Paul Scherrer Institut) Erik Fröjdh (Paul Scherrer Institut) Dominic Greiffenberg Shqipe Hasanaj (Paul Scherrer Institut) Dr Julian Heymes (Paul Scherrer Institut) Dr Viktoria Hinger (Paul Scherrer Institut) Thomas King (Paul Scherrer Institut) Pawel Kozlowski (Paul Scherrer Institut) Carlos Lopez Cuenca (PSI - Paul Scherrer Institut) Dr Davide Mezza (Paul Scherrer Institut) Konstantinos Moustakas Aldo Mozzanica Christian Ruder (Paul Scherrer Institut) Bernd Schmitt Dhanya Thattil (Paul Scherrer Institut) Xiangyu Xie (Paul Scherrer Institut) Jiaguo Zhang (Paul Scherrer Institut)

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