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A new readout system for CsI-coated MWPCs, used in the COMPASS RICH detector, has been proposed and tested in nominal high-rate conditions. It is based on the APV25-S1 analog sampling chip, and will replace the Gassiplex chip readout used up to now. The APV chip, originally designed for silicon microstrip detectors, is shown to perform well even with “slow” signals from a MWPC, keeping a signal-to-noise...
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