On the rework and development of new Geant4 Cherenkov models

Abstract A recent experiment showed that a Cherenkov radiation spectrum from thin radiators with a wavelength-dependent refractive index could transform into quasi-monochromatic spectral lines. Simulations based on the standard Geant4 toolkit could not correctly describe the experimental results because Geant4 uses the traditional Frank-Tamm theory developed for an ideal (infinitely thick) radiator. Because of that, we endeavor to present a new way of utilizing Cherenkov radiation using newly developed Geant4 models and comparing simulation results with the experimental ones. Now, one can analyze quasi-monochromatic Cherenkov spectral lines using Geant4, which is a significant milestone for investigating the possibilities of this technique. Also, this paper should be used as a text to help people understand the Cherenkov process in Geant4 and what one can expect from various models.