Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 28: Instrumentation and Applications III

HK 28.1: Group Report

Wednesday, March 13, 2002, 10:45–11:15, F

The Readout System of the COMPASS Experiment
— •Thomas Schmidt¹, H. Angerer², A. Danasino¹, H. Fischer¹, J. Franz¹, B. Grube², A. Grünemaier¹, S. Hedicke¹, F.H. Heinsius¹, M. von Hodenberg¹, F. Karstens¹, W. Kastaun¹, K. Königsmann¹, I. Konorov², J. Reymann¹, H. Schmitt¹, L. Schmitt², and J. Worch¹ — ¹Fakultät für Physik, Universität Freiburg — ²Physik-Department E18, Technische Universität München

COMPASS is a fixed-target experiment at CERN to investigate the spin structure of the nucleon, particularly seeking to determine the gluon polarization. Large data and event-rates made the development of a new Data Acquisition (DAQ) System necessary. Data are digitized directly at the detector and transfered to common readout interfaces (CATCH). These initialize all frontend-boards at the start of the data acquisition, distribute the clock and trigger-signals of the trigger-control system to all connected equipments and monitor the trigger and data-flow.

CATCH is realized as a 9U VME-module based on reprogrammable FPGA chips. For adaptation of different types of detectors the inputs are designed as exchangeable mezzanine-cards. Data arriving at the CATCH are sorted and transfered to a networked DAQ system via optical S-Link at a rate of up to 1.2 Gbit/s in a detector independent format.

In 2001 data of more than 150 000 electronic channels have been recorded. Functionality and performance of the CATCH and the DAQ-system during last year’s beam time are presented.

This project is supported by the BMBF.