Low Gain Avalanche Detectors for the HADES reaction time (T $$_0$$ 0 ) detector upgrade
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Special Article - New Tools and Techniques
Low Gain Avalanche Detectors for the HADES reaction time (T0 ) detector upgrade J. Pietraszko1,a , T. Galatyuk1,2 , V. Kedych2 , M. Kis1, W. Koenig1, M. Koziel3 , W. Krüger2 , R. Lalik4 , S. Linev1, J. Michel3 , S. Moneta5 , A. Rost2 , A. Schemm6 , C. J. Schmidt1, K. Sumara4 , M. Träger1, M. Traxler1, Ch. Wendisch1 1
GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany Technische Universität Darmstadt, 64289 Darmstadt, Germany 3 Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany 4 Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland 5 Università di Pisa, 56126 Pisa, Italy 6 IMT Atlantique, Campus de Nantes, 44307 Nantes, France
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Received: 7 February 2020 / Accepted: 24 June 2020 © The Author(s) 2020 Communicated by Klaus Peters
Abstract Low Gain Avalanche Detector (LGAD) technology has been used to design and construct prototypes of timezero detector for experiments utilizing proton and pion beams with High Acceptance Di-Electron Spectrometer (HADES) at GSI Darmstadt, Germany. LGAD properties have been studied with proton beams at the COoler SYnchrotron facility in Jülich, Germany. We have demonstrated that systems based on a prototype LGAD operated at room temperature and equipped with leading-edge discriminators reach a time precision below 50 ps. The application in the HADES, experimental conditions, as well as the test results obtained with proton beams are presented.
hardness [9] and low production costs, are very attractive for tracking and timing applications. A demonstration system has been realized as a beam telescope consisting of the two LGAD strip sensors, which was exposed to a proton beam at the COSY Synchrotron at Jülich, Germany. This paper describes the experimental setup, the data readout system, and details of the analysis. Particular emphasis is put on the results obtained with these prototype sensors, further steps towards the final system for production experiments with HADES are summarized in the outlook.
2 T0 detector requirements for Minimum Ionizing Particle (MIP) beams 1 Introduction The HADES collaboration [1] is developing a new time-zero (T0 ) and beam tracking system for the upcoming experiments that will use proton and pion beams [2]. This system is meant to replace the currently utilized single-crystal chemical vapor deposition (scCVD) diamond based detector that, although successfully used for these purposes [3,4], possess a number of limitations, like e.g. small sample sizes, with typical dimensions not larger than 5 mm × 5 mm, that do not allow to build large area detectors. The newly available sensors based on the Low Gain Avalanche Detector technology (LGAD) [5–7], aka Ultra Fast Silicon Detectors (UFSD), provide excellent position measurement capabilities and additionally a fast signal response with a precision better than 100 ps [8]. These properties, combined with high radiation a e-mail:
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