Optical systems for future Ring Imaging Cherenkov detectors

Optical systems for Ring Imaging Cherenkov (RICH) detectors have historically taken a variety of designs. Nowadays, technological developments allow more flexibility in the design and construction than was possible in the past, such as lightweight secondary mirrors that can be placed in the acceptance of an experiment, widespread use of non-spherical optical surfaces, flexible and fast tools for parametric optimisation of the optical systems before feeding into a full detector simulation. Within this context, the design of the LHCb RICH optical system for the current Run-3 data-taking of the LHC will be presented and compared to the parametric design of the proposed optics for the Upgrade II for the future HL-LHC phase.