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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Instrumentation VII

HK 29.5: Vortrag

Dienstag, 15. März 2016, 17:30–17:45, S1/01 A2

Overview and Future Developments of the FPGA--based DAQ of COMPASS — Yunpeng Bai¹, Martin Bodlak², Vladimir Frolov³, Vladimir Jary⁴, Stefan Huber¹, Igor Konorov¹, Dmytro Levit¹, Josef Novy^3,4, •Dominik Steffen^1,3, and Miroslav Virius⁴ — ¹Physik-Department E18, Technische Universität München — ²Department of Low-Temperature Physics, Charles University Prague — ³European Organization for Nuclear Research - CERN — ⁴Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University

COMPASS is a fixed--target experiment at the SPS accelerator at CERN dedicated to the study of hadron structure and spectroscopy. In 2014, an FPGA--based data acquisition system (FDAQ) was deployed. Its hardware event builder consisting of nine custom designed FPGA--cards replaced 30 distributed online computers and around 100 PCI cards. As a result, the new DAQ provides higher bandwidth and better reliability. By buffering the data, the system exploits the spill structure of the SPS averaging the maximum on--spill data rate of 1.5 GB/s over the whole SPS duty cycle. A modern run control software allows user--friendly monitoring and configuration of the hardware nodes of the event builder. From 2016, it is planned to wire all point--to--point high--speed links via a fully programmable crosspoint switch. The crosspoint switch will provide a fully customizable DAQ network topology between front--end electronics, the event building hardware, and the readout computers. It will therefore simplify compensation for hardware failure and improve load balancing.