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The second generation Extreme Universe Space Observatory on a Super-PressureBalloon (EUSO-SPB2) mission is a stratospheric balloon mission developed withinthe Joint Exploratory Missions for Extreme Universe Space Observatory(JEM-EUSO) program. The Fluorescence Telescope (FT) is one of the two separateSchmidt telescopes of EUSO-SPB2, which aims at measuring the fluorescenceemission of extensive air showers from cosmic rays above the energy of 1 EeV,looking downwards onto the atmosphere from the float altitude of 33 km. The FTmeasures photons with a time resolution of 1.05 $\mu$s in two different modes:single photon counting (PC) and charge integration (KI). In this paper, wedescribe the latter and report on the measurements of its characteristics. Wealso present a new trigger based on this channel, the so-called KI trigger,which allows to measure additional types of events, namely very short andintense light pulses. We report on the tests of this trigger mode in thelaboratory and at the TurLab facility, and its implementation in the EUSO-SPB2mission.

Tests and characterisation of the KI trigger for fast events on the EUSO-SPB2 Fluorescence Telescope