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The precision measurement of $K^{+} \rightarrow \pi^{+} \nu \bar{\nu}$ at theNA62 experiment requires a kaon identification detector to have a timeresolution better than 100ps, at least 95% kaon identification efficiency, anda pion misidentification probability of less than $10^{-4}$. Since the start ofNA62 data taking in 2016, kaon identification has been performed by adifferential Cherenkov with achromatic ring focus (CEDAR) detector with anitrogen gas radiator. A new CEDAR using hydrogen (CEDAR-H) as a radiator gashas been developed to reduce the material in the beamline, reducing the beamparticle scattering within the detector. CEDAR-H was validated during atwo-week test beam at CERN in 2022 and was approved by the NA62 collaborationfor use in data taking from 2023. The test beam results, installation andcommissioning in the NA62 beamline are reported.

A new hydrogen-filled Cherenkov detector for Kaon tagging at the NA62 experiment at CERN