JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB AU - Novokshonov, A.I. ED - Forck, Peter ED - Wawrzyniak, Adriana ED - Schaa, Volker R.W. ED - Kowalski, Grzegorz W. ED - Cudek, Agnieszka (SOLARIS, Kraków TI - First Observation of Quasi-Monochromatic Optical Cherenkov Radiation in a Dispersive Medium (Quartz) J2 - Proc. of IBIC2022, Kraków, Poland, 11-15 September 2022 CY - Kraków, Poland T2 - International Beam Instrumentation Conference T3 - 11 LA - english AB - Spectral properties of optical Cherenkov radiation (ChR) were studied both theoretically and experimentally. This type of radiation has a continuous spectral distribution which allows to use it in different fields of physics. By exploiting the frequency dependence of the target permittivity it is possible to observe quasi-monochromatic radiation. A theoretical model based on a surface current approach is presented. In order to test the predictions, an experiment was carried out using 855 MeV electrons and a 0.2 mm thick quartz target as radiator. Quasi-monochromatic ChR was observed with a spectrometer, and tilting the radiator crystal offered the possibility to tune the radiation wavelength. The monochromatization effect is attributed to the frequency dependence of the quartz permittivity, and taking into account the refraction law it is possible to deduce a dispersion relation which connects ChR wavelength and target tilt angle for fixed observation angle. Dispersion relation and model description are confirmed in the experiment. Exploiting the ChR monochromatization mechanism might offer versatile tools which can find applications in beam diagnostics. PB - JACoW Publishing CP - Geneva, Switzerland ER -