This article is cited in 4 papers

OPTICS AND NUCLEAR PHYSICS

Asymmetry of the angular distribution of radiation of channeled relativistic electrons in optically transparent crystals

K. B. Korotchenko^ab, Yu. L. Pivovarov<sup>a

a</sup> Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, pl. Akademika Zueva 1, Tomsk, 634000, Russia
^b Department of Experimental Physics, National Research Tomsk Polytechnic University, pr. Lenina 30, Tomsk, 634050, Russia

Abstract: It has been shown that optical and ultraviolet radiation from relativistic electrons at planar channeling in optically transparent crystals is characterized by an unusual dependence on the polar and azimuth angles. A fraction of radiation with the frequency $\omega$ near which the derivative of the refractive index is nonzero, $n'(\omega) = dn(\omega)/d\omega \neq 0$, should be observed at an angle close to $\pi/2$ with respect to the electron beam. For normal dispersion ($n'(\omega)>0$), this angle is smaller than $\pi/2$, whereas for anomalous dispersion ($n'(\omega)<0$), it is larger than $\pi/2$ (“backward” radiation). A pronounced dependence of the radiation intensity on the azimuth angle $\varphi$, i.e., azimuthal asymmetry, appears beyond the region of normal and anomalous dispersion at a fixed polar angle $\theta$. In particular, the ratio of radiation intensities at angles $\varphi = 0$ and $\pi/2$ at $\theta = \pi/2$ reaches a maximum value of about the square of the refractive index.

Received: 18.11.2015

DOI: 10.7868/S0370274X1602003X

 English version: Journal of Experimental and Theoretical Physics Letters, 2016, 103:2, 87–93

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