First observation of quasi–monochromatic optical Cherenkov radiation in a dispersive medium (quartz)
نویسندگان
چکیده
The present article summarizes the results of a study optical Cherenkov radiation (ChR) spectral properties both theoretically and experimentally. This type has continuous distribution which allows to use it in different fields physics as for charged particle identification or generation intense THz radiation. By exploiting frequency dependency target permittivity is possible observe quasi–monochromatic A theoretical model based on surface current approach presented predict angular ChR. In order test predictions, an experiment was carried out using 855 MeV electrons 0.2 mm thick quartz radiator could be rotated with respect beam axis. Quasi–monochromatic ChR observed spectrometer placed at fix observation angle, tilting crystal offered possibility tune wavelength. monochromatization effect attributed permittivity, taking into account refraction law emitted crossing boundary between vacuum deduce dispersion relation connects wavelength outgoing photon angle - alternative way tilt fixed angle. clearly confirmed experiment, predictions show satisfactory agreement measurements. Exploiting mechanism might offer versatile tools can find applications example diagnostics modern accelerators. • polarization currents approach. Beam divergence profile measurements spectrum.
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ژورنال
عنوان ژورنال: Physics Letters
سال: 2021
ISSN: ['1873-2429', '0375-9601']
DOI: https://doi.org/10.1016/j.physleta.2021.127680