München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Instrumentation II

HK 8.2: Talk

Monday, March 18, 2019, 14:15–14:30, HS 12

Calibration of the Energy-Sum Trigger for the Crystal Barrel Calorimeter at ELSA — •Sebastian Ciupka, Christian Honisch, Michael Lang, Johannes Müllers, Martin Urban, and Reinhard Beck for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Bonn

The Crystal Barrel Calorimeter at the electron accelerator ELSA in Bonn, is used to detect photons from meson decays. The number of clusters produced by the photons is used in the trigger. This talk presents an upcoming upgrade which will include a fast analogous energy-sum in the trigger, allowing the suppression of specific signatures. The summation over 1320 CsI(Tl) detectors is realised in two steps, in a first step the signal of one sector, consisting of up to 23 channels, will be summed up, resulting in 60 individual signals, which will be added together in a second step.

Crucial for setting a precise energy threshold is the calibration of the individual channels of the electronics, performing the summation. This talk will present the current status of the prototype development for the first summation step, show its performance and discuss different calibration methods, as well as the achieved precision.