Gain and Features of Radiation of Positrons in a Crystalline Undulator with Sections

The undulator radiation of positrons channeled in a crystalline undulator with sections (CUS) is investigated theoretically taking into account the effect of dielectric polarization of the crystalline medium. The configuration of CUS preserves planar channeling of positrons with a given energy. An a...

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Bibliographic Details
Published in:Journal of contemporary physics 2021-07, Vol.56 (3), p.159-168
Main Authors: Gevorgyan, H. L., Gevorgian, L. A., Shamamian, A. H.
Format: Article
Language:English
Subjects:
Crystal structure
Crystallinity
Dielectric polarization
Emitters
Particle and Nuclear Physics
Photons
Physics
Physics and Astronomy
Positrons
Radiation
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Summary:The undulator radiation of positrons channeled in a crystalline undulator with sections (CUS) is investigated theoretically taking into account the effect of dielectric polarization of the crystalline medium. The configuration of CUS preserves planar channeling of positrons with a given energy. An analytical expression is obtained for the spectral distribution of the number of radiated photons. The features of this spectrum are presented. As expected, such a modification of the crystalline undulator results in the gain of radiation owing to the constructive interference of the radiation fields formed in separate sections. The optimal parameters of the CUS are found. Such micro-emitters will find wide practical applications because they generate directional beams of both hard and soft photons.
ISSN:1068-3372
1934-9378
DOI:10.3103/S1068337221030117