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Radiation from a longitudinal bunch with variable charge value
Phys. Rev. Accel. Beams 29, 073802 – Published 29 July, 2026
DOI: https://doi.org/10.1103/37hr-m4kl
Abstract
The work studies the electromagnetic field of a thin extended (filament) bunch of charged particles formed over some finite time. The main attention is paid to the analysis of the radiation field. We show that the radiation field is the main part of the total field in the relatively thin spherical layer with the thickness determined by the time interval of the bunch formation. The energy characteristics of the radiation, including the angular distribution of the power, the power and the total energy of the radiation, as well as the spectral energy characteristics, are calculated and analyzed. The radiation under consideration is compared with the radiation of a variable point charge moving with a constant velocity, as well as with the bremsstrahlung of a point charge having constant magnitude.
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