Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Instrumentation IX

HK 40.2: Group Report

Wednesday, April 1, 2020, 17:00–17:30, J-HS K

An FPGA-based Sampling-ADC Readout for the Crystal Barrel Calorimeter — •Johannes Müllers for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Bonn

The CBELSA/TAPS experiment at the electron accelerator ELSA (Bonn) investigates the photoproduction of mesons off protons and neutrons. After a redesign of the front-end and back-end electronics of the Crystal Barrel calorimeter, the experiment is taking data again since 2017.

One component remains to be exchanged: The charge-sensitive digitizer (QDC) of the calorimeter. It limits the readout rate of the experiment to 2kHz and cannot detect pile-up events in the high-rate forward angles. A new sampling-ADC has been adapted from the PANDA-SADC as a replacement for the QDC, featuring 14bit@80MS/s ADCs and Kintex 7 FPGAs. A custom firmware allows to extract energy and timing information and can detect pile-up pulses. The firmware has been tested with event rates well above 10kHz and delivers data reliably over a 1Gbit/s UDP link.

The sampling-ADCs have been running in a prototype setup in parallel to the QDC readout for multiple beam times, with one quarter of the calorimeter read out. The hardware development will be summarized and selected modules and algorithms of the firmware will be presented. The performance will be demonstrated with various analysis results.