The X and Gamma Imaging Spectrometer instrument on-board the THESEUS mission (selected by ESA in the framework of the Cosmic Vision M5 launch opportunity, currently in phase A) is based on a detection plane composed of several thousands of single active elements. Each element comprises a 4.5x4.5x30 mm 3 CsI(Tl) scintillator bar, optically coupled at both ends to Silicon Drift Detectors (SDDs). The SDDs acts both as photodetectors for the scintillation light and as direct X-ray sensors. In this paper the design of the XGIS detection plane is reviewed, outlining the strategic choices in terms of modularity and redundancy of the system. Results on detector-electronics prototypes are also described. Moreover, the design and development of the low-noise front-end electronics is presented, emphasizing the innovative architectural design based on custom-designed Application-Specific Integrated Circuits (ASICs).
@article{arxiv.2102.08694,
title = {The XGIS instrument on-board THESEUS: the detection plane and on-board electronics},
author = {Fabio Fuschino and Riccardo Campana and Claudio Labanti and Lorenzo Amati and Enrico Virgilli and Luca Terenzi and Pierluigi Bellutti and Giuseppe Bertuccio and Giacomo Borghi and Francesco Ficorella and Massimo Gandola and Marco Grassi and Giovanni La Rosa and Paolo Lorenzi and Piero Malcovati and Filippo Mele and Piotr Orleański and Antonino Picciotto and Alexandre Rachevski and Irina Rashevskaya and Andrea Santangelo and Paolo Sarra and Giuseppe Sottile and Christoph Tenzer and Andrea Vacchi and Zampa Gianluigi and Nicola Zampa and Nicola Zorzi and Paul hedderman and M. Winkler and Alessandro Gemelli and Ifran Kuvvetli and Søren Møller Pedersen and Denis Tcherniak and Lucas Christoffer Bune Jensen},
journal= {arXiv preprint arXiv:2102.08694},
year = {2021}
}