Data Acquisition System of the CLOUD Experiment at CERN

The Cosmics Leaving OUtdoor Droplets (CLOUD) experiment at the European Organization for Nuclear Research (CERN) is investigating nucleation and growth of aerosol particles under atmospheric conditions their activation into cloud droplets. comprises an ultraclean 26 m 3 chamber its associated systems (the CLOUD facility) together with a suite around 50 advanced instruments attached to via sampling probes analyze contents. set changes each experimental campaign according scientific goals. central function DAQ (data acquisition) system combine data from these autonomous inhomogeneous single, integrated database. needs be highly adaptable allow fast setup over single installation week start when are brought CERN installed chamber. Each requires high flexibility response in instrument configuration or parameters. experiments require online monitoring physical chemical measurements delays only few seconds. In addition, raw data, databases, processed must archived provided international collaboration both real-time later analyses. We will describe various components computing infrastructure, reasons chosen solutions.