Abstract
The NA62 experiment at CERN, aiming at a precision measurement of the ultra-rare decay K+→π+νν¯, relies on a gas based RICH detector for π/μ separation and level 0 trigger. The experimental requirements for this detector are a time resolution better than 100ps and a muon rejection factor better than 5×10−3 in the momentum range 15–35GeV/c. A first prototype of such a detector has been built and tested in 2007, as a first check of its time resolution and of the light collection technique; it consists in a full length (18m) Ne filled vessel equipped with a spherical mirror and 96PMs on its focal plane, ≈17m upstream of the mirror. The prototype has been tested at CERN SPS on a 200GeV/c pion beam mainly; the time resolution has been found to be about 65ps, and the light collection, i.e. the number of hit PMs per ring, fairly as expected.
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