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Our aim is to optimize an aerogel threshold detector for the smallest possible diameter of PMT. We optimize the light collection using the focalization of the Cherenkov light with a Fresnel lens. The beam of photons is then sent onto a mirror to be reflected to the PMT. We have built and tested a first prototype with a 10×10×10cm3 aerogel radiator of n=1.03. The first results of these measurements,...
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