期刊
SYMMETRY-BASEL
卷 13, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/sym13020159
关键词
free electron laser; synchrotron radiation; Bessel functions; generating functions; integral representation
资金
- Enea Research Center individual fellowship
The paper reviews the theory of Generalized Bessel Functions and their applications in studying electro-magnetic processes, focusing on emission of bremsstrahlung radiation by ultra-relativistic electrons and operation of Free Electron Lasers. It emphasizes the importance of Generalized Bessel Functions in analyzing spectral properties of emitted radiation by relativistic charges and their flexibility in accounting for a wide variety of phenomena.
The theory of Generalized Bessel Functions is reviewed and their application to various problems in the study of electro-magnetic processes is presented. We consider the cases of emission of bremsstrahlung radiation by ultra-relativistic electrons in linearly polarized undulators, including also exotic configurations, aimed at enhancing the harmonic content of the emitted radiation. The analysis is eventually extended to the generalization of the FEL pendulum equation to treat Free Electron Laser operating with multi-harmonic undulators. The paper aims at picking out those elements supporting the usefulness of the Generalized Bessel Functions in the elaboration of the theory underlying the study of the spectral properties of the bremsstrahlung radiation emitted by relativistic charges, along with the relevant flexibility in accounting for a large variety of apparently uncorrelated phenomenolgies, like multi-photon processes, including non linear Compton scattering.
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