Cherenkov-transition radiation in a waveguide with a dielectric-vacuum boundary

We analyze the electromagnetic field of a charged particle moving uniformly in a circular waveguide and crossing the boundary between a dielectric and a vacuum. Our study focuses on the case when Cherenkov radiation is generated in the dielectric. Analytical and numerical investigation of the wavegu...

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Veröffentlicht in:Physical review special topics. PRST-AB. Accelerators and beams 2012-09, Vol.15 (9), p.091302, Article 091302
Hauptverfasser: Alekhina, Tatiana Yu, Tyukhtin, Andrey V.
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Sprache:eng
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Zusammenfassung:We analyze the electromagnetic field of a charged particle moving uniformly in a circular waveguide and crossing the boundary between a dielectric and a vacuum. Our study focuses on the case when Cherenkov radiation is generated in the dielectric. Analytical and numerical investigation of the waveguide modes is performed. We show that a large radiation can be excited in the vacuum area. The mode amplitudes in the vacuum can be greater than those in the dielectric. The field from a Gaussian bunch is also studied. We note that the effect under consideration can be used to generate a large quasimonochromatic or multimode radiation.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.15.091302