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The NA62 RICH detector is used for the separation of pions and muons in themomentum range 15 -- 35 GeV/c and is expected to provide a muon suppressionfactor better than $10^{-2}$.  A prototype of the final detector equipped with about 400 PMs (RICH-400prototype) was built and tested in a dedicated run in 2009. The $\pi-\mu$separation was tested, as well as the effect of the pollution of the neonradiator with different amounts of oxygen and CO_2. The $\mu$ misidentificationprobability is about 0.7% and the time resolution better than 100 ps in thewhole momentum range.  We did not observe any absorption of the light due to the pollution of theradiator, however an effect on the ring radius is clearly observed due to thechange of the change of the refractive index of the medium. The conclusion ofthe studies is that the amount of CO_2 in the final detector should be wellknown or the quality of the pion identification could be seriously compromised.

Studies of the Effects of Oxygen and CO_2 Contamination of the Neon Gas Radiator on the Performance of the NA62 RICH Detector