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A fibre-optic UV system for H2SO4 production in aerosol chambers causing minimal thermal effects |
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| Authors: | A Kupc A Amorim J Curtius A Danielczok J Duplissy S Ehrhart H Walther L Ickes J Kirkby A Kürten JM Lima S Mathot P Minginette A Onnela L Rondo PE Wagner |
| Affiliation: | 1. University of Vienna, Faculty of Physics, Aerosol and Environmental Physics Group, Boltzmanngasse 5, AT-1090, Vienna, Austria;2. Simulation, Instrumentation and Modeling Group (SIM-FCUL), Faculty of Sciences of the University of Lisbon, CAMPO GRANDE, C8, 1749-016 Lisbon, Portugal;3. Institute for Atmospheric and Environmental Sciences, Goethe University of Frankfurt am Main, Altenhöferallee 1, 60438 Frankfurt am Main, Germany;4. CERN, CH-1211 Geneva, Switzerland;5. Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, CH-5232 Villigen PSI, Switzerland |
| Abstract: | A novel fibre-optic UV illumination system for sulphuric acid (H2SO4) production has been developed. The illumination system described in this paper provides sufficient ultraviolet light (UV) power while causing practically no thermal effect on the aerosol chamber (temperature variation <0.005 °C at full UV illumination). A similar thermal stability has not been achieved in other comparable experimental set-ups so far. The spectrum provided by the fibre-optic UV system corresponds to the UVB region, illuminates the chamber in a reasonably uniform way and is comparable to the ground level actinic flux. The UV system has been installed for the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber experiments at CERN. Precise, easily-adjustable and reproducible concentrations of H2SO4 were generated by adjusting the UV light intensity. This paper gives an overview on the design of this new system as well as insights on its performance and application. |
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