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Nozaki, S; Blanch, O; Delgado, C; Gliwny, P; Hadasch, D; Inome, Y; Katagiri, H; Kubo, H; Kobayashi, Y; Mazin, D; Moralejo, A; Nogami, Y; Paoletti, R; Saito, T; Sakurai, S; Sitarek, J; Takahashi, M; Teshima, M; Yamamoto, T
Journal of physics. Conference series, 02/2020, Volume: 1468, Issue: 1Journal Article, Conference Proceeding
Abstract The Cherenkov Telescope Array (CTA) is the next-generation ground-based very-high-energy gamma-ray observatory. By using three types of telescopes CTA can cover a wide energy range (20 GeV–300 TeV) with an order of magnitude higher sensitivity than the current telescopes. The Large-Sized Telescope (LST) is designed to detect 20 GeV–1 TeV gamma rays thanks to the large light collection area, sensitive photosensors, a fast trigger system, and readout electronics. The camera readout system must have a high signal-to-noise ratio and a linear signal sampling with a large dynamic range in order to efficiently detect dim and low-energy atmospheric showers. To meet this requirement we use the Domino Ring Sampler version 4 (DRS4), which also enables ultra-fast sampling with low power consumption. Some of the intrinsic characteristics of DRS4 chips require software corrections. These procedures lower the effect of non-Gaussian noise contribution and improve the timing resolution of the system. In this contribution we discuss the calibration algorithms and the resulting performance.
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