A: A large RICH detector is used in NA62 to suppress the muon contamination in the charged pion selection by a factor 100 in the momentum range between 15 and 35 GeV/c. The detector consists of a 17 m long tank (vessel), filled with neon gas at atmospheric pressure. Cherenkov light is reflected by a mosaic of 20 spherical mirrors with 17 m focal length, placed at the downstream end, and collected by 1952 photomultipliers (PMTs) placed at the upstream end. In this paper the characterization of the mirrors before installation and the mirror support system are described. The mirror installation procedure and the laser alignment are also illustrated. K: Cherenkov detectors; Large detector systems for particle and astroparticle physics; Particle identification methods

A hodoscope prototype to detect charged particles in the NA62 experiment at CERN SPS has been installed within the experimental setup in 2014 and exposed to the beam during the data taking period. Efficiency and time resolution for hodoscope tiles are measured. The average signal amplitude (proportional to the light yield) is estimated from the efficiency curves. The results of the tests have lead to several improvements in the final design of the hodoscope.

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