The organopolysilanes Me(Me2Si)nMe (n = 4–6), (Me2Si)6 and (Me3Si)2SiMePh are found to be effective photoinitiators for the polymerization of vinyl‐containing siloxane rubbers. The trisilanes Me(ME2Si)3Me and Me3SiSiMe2SiMe2Ph are slightly effective, while phenyldisilanes do not exhibit initiation activity in the process of photocuring. Polydimethylsiloxanes are cured at a slower rate under the same conditions than vinylcontaining derivatives. Two mechanisms of crosslinking are proposed: silylene–silirane–silanol and silylene–hydride–silanol.

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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