Abstract
Modern accelerator technologies may provide electron beams consisting of ultrashort bunches with transverse sizes, which are much larger than longitudinal sizes. The spectral-angular characteristics of coherent Cherenkov radiation (CChR) produced by such bunches have thus been considered. We simulated the characteristics of CChR and those from a single charge on the basis of the polarization current model, which allowed us to consider finite sizes for the Cherenkov radiator. We calculated the angular distribution of the CChR from a bunch tilted by angle ψ with respect to the velocity direction, with the assumption of a 3-D Gaussian charge distribution in the bunch. Contrary to the azimuthally symmetrical distribution of conventional ChR, a strong azimuthal asymmetry was observed in the CChR from the tilted bunch. The maximal yield of the CChR may be achieved if the tilt angle ψ coincides with the Cherenkov angle Θ ch =arccos(1/nβ), βc is the charge velocity and n is the refraction index.
Original language | English |
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Pages (from-to) | 888-893 |
Number of pages | 6 |
Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |
Volume | 383 |
Issue number | 9 |
DOIs | |
Publication status | Published - 28 Feb 2019 |
Keywords
- Azimuthal asymmetry
- Cherenkov radiation
- Coherent radiation
- Terahertz radiation
- Tilted bunch
- Transition radiation
ASJC Scopus subject areas
- Physics and Astronomy(all)