Development of low‐energy X‐ray detectors using LGAD sensors. (18th June 2019)

• Record Type: Journal Article
• Authors: Andrä, Marie; Zhang, Jiaguo; Bergamaschi, Anna; Barten, Rebecca; Borca, Camelia; Borghi, Giacomo; Boscardin, Maurizio; Busca, Paolo; Brückner, Martin; Cartiglia, Nicoló; Chiriotti, Sabina; Dalla Betta, Gian-Franco; Dinapoli, Roberto; Fajardo, Pablo; Ferrero, Marco; Ficorella, Francesco; Fröjdh, Erik; Greiffenberg, Dominic; Huthwelker, Thomas; Lopez-Cuenca, Carlos; Meyer, Markus; Mezza, Davide; Mozzanica, Aldo; Pancheri, Lucio; Paternoster, Giovanni; Redford, Sophie; Ruat, Marie; Ruder, Christian; Schmitt, Bernd; Shi, Xintian; Sola, Valentina; Thattil, Dhanya; Tinti, Gemma; Vetter, Seraphin;
• Is Part Of: Journal of synchrotron radiation. Volume 26:Part 4(2019)
• Page Start: 1226
• Page End: 1237
• Publication Date: 2019-06-18
• Subjects: hybrid detectors -- silicon detectors -- low gain avalanche detectors -- single photon counting; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577519005393
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : Low‐gain avalanche detectors have been characterized using X‐rays. Preliminary tests show promising results towards the development of soft X‐ray single‐photon‐counting detectors. Abstract : Recent advances in segmented low‐gain avalanche detectors (LGADs) make them promising for the position‐sensitive detection of low‐energy X‐ray photons thanks to their internal gain. LGAD microstrip sensors fabricated by Fondazione Bruno Kessler have been investigated using X‐rays with both charge‐integrating and single‐photon‐counting readout chips developed at the Paul Scherrer Institut. In this work it is shown that the charge multiplication occurring in the sensor allows the detection of X‐rays with improved signal‐to‐noise ratio in comparison with standard silicon sensors. The application in the tender X‐ray energy range is demonstrated by the detection of the sulfur K α and K β lines (2.3 and 2.46 keV) in an energy‐dispersive fluorescence spectrometer at the Swiss Light Source. Although further improvements in the segmentation and in the quantum efficiency at low energy are still necessary, this work paves the way for the development of single‐photon‐counting detectors in the soft X‐ray energy range.