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Proceedings Paper

Effect of harmonics coherence in resonant transition radiation
Author(s): Lekdar Gevorgian
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Paper Abstract

In the present work an essential difference is revealed between the undulator and transition radiation processes. In the first case emission of a photon occurs at a certain angle, while in the second case radiation takes place with equal probability in both dense and dilute parts of the medium and at various angles. These angles are different for different harmonics and their angular widths, which determine the frequency spectrum of radiation, do not depend on the harmonic number. The higher harmonic the wider the frequency ranges of emission. The weighting function of overlap of the harmonic spectra has a sharp peak in the soft range of frequencies. The peak increases and its width quadratic decreases depending on the electron energy. Therefore, the number of emitted soft photons does not depend on the energy and quadratic depends on the number of harmonics. A new physical phenomenon has been revealed: coherent emission of harmonics in the soft frequency range. Thus, it is possible to obtain intense beams of soft photons using high-current electron bunches.

Paper Details

Date Published: 2 May 2007
PDF: 5 pages
Proc. SPIE 6634, International Conference on Charged and Neutral Particles Channeling Phenomena II, 663413 (2 May 2007); doi: 10.1117/12.741929
Show Author Affiliations
Lekdar Gevorgian, Yerevan Physics Institute (Armenia)

Published in SPIE Proceedings Vol. 6634:
International Conference on Charged and Neutral Particles Channeling Phenomena II
Sultan B. Dabagov, Editor(s)

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