Gaseous radiators are required for high momenta hadron PID, where limited length of the radiator compatible with a collider experiment is the key challenge. Selecting photon wavelength in far UltraViolet (UV) domain, around 120 nm, is an effective option to increase number of detectable photons: here the Cherenkov photon rate is higher. In this domain, gaseous photodetectors with Cesium Iodide (CsI) photocathode are ideal sensors. Limited material budget, operation ability in magnetic field, cheapest option for large surfaces are additional key features of these sensors. A concrete example is by the MicroPattern Gaseous Detectors (MPGD) based PhotoDetectors (PD) used in 2016 to upgrade COMPASS RICH.
Their characteristics suggest that these photodetectors are particularly suited for the needs of high momentum hadron PID at future EIC. We aim further developments: among them the use of fully innovative photoconverters (PC) based on hydrogenated NanoDiamond(ND) crystals, being presently developed. These novel and robust photocathodes do not require production at high temperatures or in vacuum; therefore they can replace the standard PCs in window-less RICHes. Moreover, they are of interest also in sectors beyond particle physics.
All the developments are performed by detector design supported by propaedeutic studies, prototype realization and tests. These studies are in an initial stage and we report about the first R&D steps.