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Preprint 12e/99

THE IBIS DATA HANDLING SYSTEM

M. Stuhlinger, E. Goehler, C. Dreischer, R. Volkmer, R. Staubert, E. Kendziorra, N. v.Krusenstiern, P. Risse, R. Weiss

Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany

To appear in: CONFERENCE PROCEEDINGS X-ray Astronomy '99, published in Astrophysical Letters and Communications, 1999,

Abstract. The Imager on Board of INTEGRAL (IBIS) has to cope with very high data rates (>15.000 events/sec) from two detector layers (ISGRI and PICsIT). Because the available telemetry rate is only about 1/30 of the expected maximum data rate an on-board data reduction and pre-processing is neccessary. This task is performed by a tailored fast Hardware Event Preprocessor (HEPI) and a slow programmable Data Processing Electronics (DPE). Several processing modes can be combined to adapt the instrument IBIS to the aims of the observers. The functions and methods of the digital on-board data processing (hardware and software) are described.

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Paper (46k gzip'ed Postscript including figures)

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