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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.11: Poster

Tuesday, March 28, 2017, 16:45–18:45, F Foyer

Energy Sum for the Avalanche Photo Diode readout for the Crystal Barrel calorimeter — •Sebastian Ciupka for the CBELSA/TAPS collaboration — Helmholtz-Instituts für Strahlen- und Kernphysik, Universität Bonn

The Crystal Barrel (CB) calorimeter at the accelerator facility ELSA in Bonn,which consists of 1320 CsI(Tl) crystals, has recently been upgraded by a new Avalanche Photo Diode (APD) crystal readout. The APD readout provides a sufficiently fast trigger signal to allow a cluster finder to be included in the first level trigger. The upgrade also presents the opportunity for a new trigger condition utilizing the energy sum of the CB-calorimeter.

A newly developed board will sum up the analogue signals of one CB segment. This board contains a 4-bit adjustable resistance per channel to allow for an individual weight for each crystal, as well as an adjustable offset, all controlled via the I2C-Bus. Additionally an ADC allows the board to monitor the sum and the signal of individual channels and automatically calibrate the weights of all channels.

This poster presents the features of the energy sum board and its properties.

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