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Scharenberg, L.; Bortfeldt, J.; Brunbauer, F.; Desch, K.; Garcia, F.; Hracek, M.; Janssens, D.; Lisowska, M.; Lupberger, M.; Muller, H.; Luz, H. Natal da; Oliveri, E.; Pfeiffer, D.; Pulkkinen, H.; Ropelewski, L.; Samarati, J.; Stenis, M. van; Utrobicic, A. and Veenhof, R. (2021): X-ray imaging with gaseous detectors using the VMM3a and the SRS. In: Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment, Vol. 1011, 165576

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The integration of the VMM3a Application-Specific Integrated Circuit (ASIC) into RD51's Scalable Readout System (SRS) provides a versatile tool for the readout of Micro-Pattern Gaseous Detectors (MPGDs). With its self-triggered high-rate readout, its analogue part that allows to get information on the deposited energy in the detector, and its so-called neighbouring-logic that allows to recover information on the charge distribution, this new system has features of particular interest for digital X-ray imaging. In the present article, we want to emphasise the capabilities of VMM3a/SRS by presenting results of X-ray imaging studies. We will highlight the advantages on the energy and the spatial resolution provided by the neighbouring-logic. In the first part, we focus on spatial resolution studies. We show how segmented readout structures introduce a repeating pattern in the distribution of the reconstructed positions (using the centre-of-gravity method) and how this behaviour can be mitigated with the neighbouring-logic. As part of these studies, we explore as well an alternative position reconstruction algorithm. In the second part of the article, we present the energy resolution studies.

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