Coherent Spontaneous Emission from Short Electron Bunches: Competition between Different Transverse Waveguide Modes

In this paper, we study spontaneous coherent undulator emission from a short dense electron bunch. A special “negative-mass” undulator ensuring stabilization of the axial size of the bunch is considered. We focus on the situation where the competition between two different transverse waveguide modes...

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Bibliographic Details
Published in:Symmetry (Basel) 2023-05, Vol.15 (5), p.1053
Main Authors: Oparina, Yuliya, Savilov, Andrei
Format: Article
Language:English
Subjects:
Competition
Electrons
Emission analysis
Group velocity
Magnetic fields
mode competition
Radiation
Resonance
Spontaneous emission
Synchronism
terahertz radiation
undulator radiation
Velocity
Wave groups
Waveguides
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Summary:In this paper, we study spontaneous coherent undulator emission from a short dense electron bunch. A special “negative-mass” undulator ensuring stabilization of the axial size of the bunch is considered. We focus on the situation where the competition between two different transverse waveguide modes takes place, so that the undulator resonance is provided simultaneously for three waves placed on the dispersion diagram symmetrically with respect to electrons (namely, the group velocity of the higher waveguide mode coincides with the electron velocity, whereas two resonance frequencies of the lower transverse mode correspond to wave group velocities, one of which slightly exceeds the translational velocity of electrons, with the other being less than the electron velocity). We show that the higher waveguide mode can win this competition due to its proximity to group synchronization with the electron bunch.
ISSN:2073-8994
2073-8994
DOI:10.3390/sym15051053