Widget: A data acquisition system for a balloon borne SI particle calorimeter

Computer Science

Scientific paper

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Balloon-Borne Instruments, Calorimeters, Cosmic Rays, Data Acquisition, Signal Analyzers, Signal Processing, Intelligence, Semiconductors (Materials), Silicon

Scientific paper

We describe Widget, a complete data acquisition system (DAS) designed for a balloon-borne calorimeter using silicon strip detectors. The design includes a general purpose CPU as well as five to twenty Digital Signal Processors in order to control the acquisition of the data. This local intelligence also allows the instrument to re-calibrate itself, to perform calculations on the data, and to control the functionality of the instrumentation. The DSP's filter the data to avoid overflowing the radio link to ground. In principle, the system could control the instruments, without direct intervention from the ground, on flights with durations of several days.

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